BE Configuration

BE Configuration

This document mainly introduces the relevant configuration items of BE.

The BE configuration file be.conf is usually stored in the conf/ directory of the BE deployment path. In version 0.14, another configuration file be_custom.conf will be introduced. The configuration file is used to record the configuration items that are dynamically configured and persisted by the user during operation.

After the BE process is started, it will read the configuration items in be.conf first, and then read the configuration items in be_custom.conf. The configuration items in be_custom.conf will overwrite the same configuration items in be.conf.

The location of the be_custom.conf file can be configured in be.conf through the custom_config_dir configuration item.

View configuration items

Users can view the current configuration items by visiting BE’s web page:

http://be_host:be_webserver_port/varz

Set configuration items

There are two ways to configure BE configuration items:

Static configuration

Add and set configuration items in the conf/be.conf file. The configuration items in be.conf will be read when BE starts. Configuration items not in be.conf will use default values.
Dynamic configuration

After BE starts, the configuration items can be dynamically set with the following commands.
```
curl -X POST http://{be_ip}:{be_http_port}/api/update_config?{key}={value}
```
In version 0.13 and before, the configuration items modified in this way will become invalid after the BE process restarts. In 0.14 and later versions, the modified configuration can be persisted through the following command. The modified configuration items are stored in the be_custom.conf file.
```
curl -X POST http://{be_ip}:{be_http_port}/api/update_config?{key}={value}\&persist=true
```

Examples

Modify max_base_compaction_threads statically

By adding in the be.conf file:

max_base_compaction_threads=5

Then restart the BE process to take effect the configuration.
Modify streaming_load_max_mb dynamically

After BE starts, the configuration item streaming_load_max_mb is dynamically set by the following command:
```
curl -X POST http://{be_ip}:{be_http_port}/api/update_config?streaming_load_max_mb=1024
```
The return value is as follows, indicating that the setting is successful.
```
{
    "status": "OK",
    "msg": ""
}
```
The configuration will become invalid after the BE restarts. If you want to persist the modified results, use the following command:
```
curl -X POST http://{be_ip}:{be_http_port}/api/update_config?streaming_load_max_mb=1024\&persist=true
```

Configurations

Services

`be_port`

Type: int32
Description: The port of the thrift server on BE which used to receive requests from FE
Default value: 9060

`heartbeat_service_port`

Type: int32
Description: Heartbeat service port (thrift) on BE, used to receive heartbeat from FE
Default value: 9050

`webserver_port`

Type: int32
Description: Service port of http server on BE
Default value: 8040

`brpc_port`

Type: int32
Description: The port of BRPC on BE, used for communication between BEs
Default value: 8060

`single_replica_load_brpc_port`

Type: int32
Description: The port of BRPC on BE, used for single replica load. There is a independent BRPC thread pool for the communication between the Master replica and Slave replica during single replica load, which prevents data synchronization between the replicas from preempt the thread resources for data distribution and query tasks when the load concurrency is large.
Default value: 9070

`single_replica_load_download_port`

Type: int32
Description: The port of http for segment download on BE, used for single replica load. There is a independent HTTP thread pool for the Slave replica to download segments during single replica load, which prevents data synchronization between the replicas from preempt the thread resources for other http tasks when the load concurrency is large.
Default value: 8050

`priority_networks`

Description: Declare a selection strategy for those servers with many IPs. Note that at most one ip should match this list. This is a semicolon-separated list in CIDR notation, such as 10.10.10.0/24. If there is no IP matching this rule, one will be randomly selected
Default value: blank

`storage_root_path`

Type: string
Description: data root path, separate by ‘;’.you can specify the storage medium of each root path, HDD or SSD. you can add capacity limit at the end of each root path, separate by ‘,’.If the user does not use a mix of SSD and HDD disks, they do not need to configure the configuration methods in Example 1 and Example 2 below, but only need to specify the storage directory; they also do not need to modify the default storage media configuration of FE.

eg.1: storage_root_path=/home/disk1/doris.HDD;/home/disk2/doris.SSD;/home/disk2/doris
- 1./home/disk1/doris.HDD, indicates that the storage medium is HDD;
- 2./home/disk2/doris.SSD, indicates that the storage medium is SSD;
- 3./home/disk2/doris, indicates that the storage medium is HDD by default
eg.2: storage_root_path=/home/disk1/doris,medium:hdd;/home/disk2/doris,medium:ssd
- 1./home/disk1/doris,medium:hdd，indicates that the storage medium is HDD;
- 2./home/disk2/doris,medium:ssd，indicates that the storage medium is SSD;
Default value: ${DORIS_HOME}/storage

`heartbeat_service_thread_count`

Type: int32
Description: The number of threads that execute the heartbeat service on BE. the default is 1, it is not recommended to modify
Default value: 1

`ignore_broken_disk`

Type: bool
Description: When BE starts, check storage_root_path All paths under configuration.
- ignore_broken_disk=true
If the path does not exist or the file (bad disk) cannot be read or written under the path, the path will be ignored. If there are other available paths, the startup will not be interrupted.
- ignore_broken_disk=false
If the path does not exist or the file (bad disk) cannot be read or written under the path, the system will abort the startup failure and exit.
Default value: false

`mem_limit`

Type: string
Description: Limit the percentage of the server’s maximum memory used by the BE process. It is used to prevent BE memory from occupying to many the machine’s memory. This parameter must be greater than 0. When the percentage is greater than 100%, the value will default to 100%.
Default value: 80%

`cluster_id`

Type: int32
Description: Configure the cluster id to which the BE belongs.
- This value is usually delivered by the FE to the BE by the heartbeat, no need to configure. When it is confirmed that a BE belongs to a certain Drois cluster, it can be configured. The cluster_id file under the data directory needs to be modified to make sure same as this parament.
Default value: - 1

`custom_config_dir`

Description: Configure the location of the be_custom.conf file. The default is in the conf/ directory.
- In some deployment environments, the conf/ directory may be overwritten due to system upgrades. This will cause the user modified configuration items to be overwritten. At this time, we can store be_custom.conf in another specified directory to prevent the configuration file from being overwritten.
Default value: blank

`trash_file_expire_time_sec`

Description: The interval for cleaning the recycle bin is 72 hours. When the disk space is insufficient, the file retention period under trash may not comply with this parameter
Default value: 259200

`es_http_timeout_ms`

Description: The timeout period for connecting to ES via http.
Default value: 5000 (ms)

`es_scroll_keepalive`

Description: es scroll Keeplive hold time
Default value: 5 (m)

`external_table_connect_timeout_sec`

Type: int32
Description: The timeout when establishing connection with external table such as ODBC table.
Default value: 5 seconds

`status_report_interval`

Description: Interval between profile reports
Default value: 5

`brpc_max_body_size`

Description: This configuration is mainly used to modify the parameter max_body_size of brpc.
- Sometimes the query fails and an error message of body_size is too large will appear in the BE log. This may happen when the SQL mode is “multi distinct + no group by + more than 1T of data”.This error indicates that the packet size of brpc exceeds the configured value. At this time, you can avoid this error by increasing the configuration.

`brpc_socket_max_unwritten_bytes`

Description: This configuration is mainly used to modify the parameter socket_max_unwritten_bytes of brpc.
- Sometimes the query fails and an error message of The server is overcrowded will appear in the BE log. This means there are too many messages to buffer at the sender side, which may happen when the SQL needs to send large bitmap value. You can avoid this error by increasing the configuration.

`transfer_large_data_by_brpc`

Type: bool
Description: This configuration is used to control whether to serialize the protoBuf request and embed the Tuple/Block data into the controller attachment and send it through http brpc when the length of the Tuple/Block data is greater than 1.8G. To avoid errors when the length of the protoBuf request exceeds 2G: Bad request, error_text=[E1003]Fail to compress request. In the past version, after putting Tuple/Block data in the attachment, it was sent through the default baidu_std brpc, but when the attachment exceeds 2G, it will be truncated. There is no 2G limit for sending through http brpc.
Default value: true

`brpc_num_threads`

Description: This configuration is mainly used to modify the number of bthreads for brpc. The default value is set to -1, which means the number of bthreads is #cpu-cores.
- User can set this configuration to a larger value to get better QPS performance. For more information, please refer to https://github.com/apache/incubator-brpc/blob/master/docs/cn/benchmark.md
Default value: -1

`thrift_rpc_timeout_ms`

Description: thrift default timeout time
Default value: 10000

`thrift_client_retry_interval_ms`

Type: int64
Description: Used to set retry interval for thrift client in be to avoid avalanche disaster in fe thrift server, the unit is ms.
Default value: 1000

`thrift_connect_timeout_seconds`

Description: The default thrift client connection timeout time
Default value: 3 (m)

`thrift_server_type_of_fe`

Type: string
Description:This configuration indicates the service model used by FE’s Thrift service. The type is string and is case-insensitive. This parameter needs to be consistent with the setting of fe’s thrift_server_type parameter. Currently there are two values for this parameter, THREADED and THREAD_POOL.
- If the parameter is THREADED, the model is a non-blocking I/O model.
- If the parameter is THREAD_POOL, the model is a blocking I/O model.

`txn_commit_rpc_timeout_ms`

Description:txn submit rpc timeout
Default value: 10,000 (ms)

`txn_map_shard_size`

Description: txn_map_lock fragment size, the value is 2^n, n=0,1,2,3,4. This is an enhancement to improve the performance of managing txn
Default value: 128

`txn_shard_size`

Description: txn_lock shard size, the value is 2^n, n=0,1,2,3,4, this is an enhancement function that can improve the performance of submitting and publishing txn
Default value: 1024

`unused_rowset_monitor_interval`

Description: Time interval for clearing expired Rowset
Default value: 30 (s)

`max_client_cache_size_per_host`

Description: The maximum number of client caches per host. There are multiple client caches in BE, but currently we use the same cache size configuration. If necessary, use different configurations to set up different client-side caches
Default value: 10

`string_type_length_soft_limit_bytes`

Type: int32
Description: The soft limit of the maximum length of String type.
Default value: 1,048,576

`big_column_size_buffer`

Type: int64
Description: When using the odbc external table, if a column type of the odbc source table is HLL, CHAR or VARCHAR, and the length of the column value exceeds this value, the query will report an error ‘column value length longer than buffer length’. You can increase this value
Default value: 65535

`small_column_size_buffer`

Type: int64
Description: When using the odbc external table, if a column type of the odbc source table is not HLL, CHAR or VARCHAR, and the length of the column value exceeds this value, the query will report an error ‘column value length longer than buffer length’. You can increase this value
Default value: 100

Query

`fragment_pool_queue_size`

Description: The upper limit of query requests that can be processed on a single node
Default value: 2048

`fragment_pool_thread_num_min`

Description: Query the number of threads. By default, the minimum number of threads is 64.
Default value: 64

`fragment_pool_thread_num_max`

Description: Follow up query requests create threads dynamically, with a maximum of 512 threads created.
Default value: 512

`doris_max_pushdown_conjuncts_return_rate`

Type: int32
Description: When BE performs HashJoin, it will adopt a dynamic partitioning method to push the join condition to OlapScanner. When the data scanned by OlapScanner is larger than 32768 rows, BE will check the filter condition. If the filter rate of the filter condition is lower than this configuration, Doris will stop using the dynamic partition clipping condition for data filtering.
Default value: 90

`doris_max_scan_key_num`

Type: int
Description: Used to limit the maximum number of scan keys that a scan node can split in a query request. When a conditional query request reaches the scan node, the scan node will try to split the conditions related to the key column in the query condition into multiple scan key ranges. After that, these scan key ranges will be assigned to multiple scanner threads for data scanning. A larger value usually means that more scanner threads can be used to increase the parallelism of the scanning operation. However, in high concurrency scenarios, too many threads may bring greater scheduling overhead and system load, and will slow down the query response speed. An empirical value is 50. This configuration can be configured separately at the session level. For details, please refer to the description of max_scan_key_num in Variables.
- When the concurrency cannot be improved in high concurrency scenarios, try to reduce this value and observe the impact.
Default value: 48

`doris_scan_range_row_count`

Type: int32
Description: When BE performs data scanning, it will split the same scanning range into multiple ScanRanges. This parameter represents the scan data range of each ScanRange. This parameter can limit the time that a single OlapScanner occupies the io thread.
Default value: 524288

`doris_scanner_queue_size`

Type: int32
Description: The length of the RowBatch buffer queue between TransferThread and OlapScanner. When Doris performs data scanning, it is performed asynchronously. The Rowbatch scanned by OlapScanner will be placed in the scanner buffer queue, waiting for the upper TransferThread to take it away.
Default value: 1024

`doris_scanner_row_num`

Description: The maximum number of data rows returned by each scanning thread in a single execution
Default value: 16384

`doris_scanner_row_bytes`

Description: single read execute fragment row bytes
- Note: If there are too many columns in the table, you can adjust this config if you encounter a select * stuck
Default value: 10485760

`doris_scanner_thread_pool_queue_size`

Type: int32
Description: The queue length of the Scanner thread pool. In Doris’ scanning tasks, each Scanner will be submitted as a thread task to the thread pool waiting to be scheduled, and after the number of submitted tasks exceeds the length of the thread pool queue, subsequent submitted tasks will be blocked until there is a empty slot in the queue.
Default value: 102400

`doris_scanner_thread_pool_thread_num`

Type: int32
Description: The number of threads in the Scanner thread pool. In Doris’ scanning tasks, each Scanner will be submitted as a thread task to the thread pool to be scheduled. This parameter determines the size of the Scanner thread pool.
Default value: 48

`enable_prefetch`

Type: bool
Description: When using PartitionedHashTable for aggregation and join calculations, whether to perform HashBuket prefetch. Recommended to be set to true
Default value: true

`enable_quadratic_probing`

Type: bool
Description: When a Hash conflict occurs when using PartitionedHashTable, enable to use the square detection method to resolve the Hash conflict. If the value is false, linear detection is used to resolve the Hash conflict. For the square detection method, please refer to: quadratic_probing
Default value: true

`exchg_node_buffer_size_bytes`

Type: int32
Description: The size of the Buffer queue of the ExchangeNode node, in bytes. After the amount of data sent from the Sender side is larger than the Buffer size of ExchangeNode, subsequent data sent will block until the Buffer frees up space for writing.
Default value: 10485760

`max_pushdown_conditions_per_column`

Type: int
Description: Used to limit the maximum number of conditions that can be pushed down to the storage engine for a single column in a query request. During the execution of the query plan, the filter conditions on some columns can be pushed down to the storage engine, so that the index information in the storage engine can be used for data filtering, reducing the amount of data that needs to be scanned by the query. Such as equivalent conditions, conditions in IN predicates, etc. In most cases, this parameter only affects queries containing IN predicates. Such as WHERE colA IN (1,2,3,4, ...). A larger number means that more conditions in the IN predicate can be pushed to the storage engine, but too many conditions may cause an increase in random reads, and in some cases may reduce query efficiency. This configuration can be individually configured for session level. For details, please refer to the description of max_pushdown_conditions_per_column in Variables.
Default value: 1024
Example
- The table structure is’ id INT, col2 INT, col3 varchar (32),… ‘.
- The query request is’WHERE id IN (v1, v2, v3, …)

`max_send_batch_parallelism_per_job`

Type: int
Description: Max send batch parallelism for OlapTableSink. The value set by the user for send_batch_parallelism is not allowed to exceed max_send_batch_parallelism_per_job, if exceed, the value of send_batch_parallelism would be max_send_batch_parallelism_per_job.
Default value: 5

`serialize_batch`

Type: bool
Description: Whether the rpc communication between BEs serializes RowBatch for data transmission between query layers
Default value: false

`doris_scan_range_max_mb`

Type: int32
Description: The maximum amount of data read by each OlapScanner.
Default value: 1024

compaction

`disable_auto_compaction`

Type: bool
Description: Whether disable automatic compaction task
- Generally it needs to be turned off. When you want to manually operate the compaction task in the debugging or test environment, you can turn on the configuration.
Default value: false

`enable_vectorized_compaction`

Type: bool
Description: Whether to enable vectorized compaction
Default value: true

`enable_vertical_compaction`

Type: bool
Description: Whether to enable vertical compaction
Default value: true

`vertical_compaction_num_columns_per_group`

Type: bool
Description: In vertical compaction, column number for every group
Default value: true

`vertical_compaction_max_row_source_memory_mb`

Type: bool
Description: In vertical compaction, max memory usage for row_source_buffer
Default value: true

`vertical_compaction_max_segment_size`

Type: bool
Description: In vertical compaction, max dest segment file size
Default value: true

`enable_ordered_data_compaction`

Type: bool
Description: Whether to enable ordered data compaction
Default value: true

`ordered_data_compaction_min_segment_size`

Type: bool
Description: In ordered data compaction, min segment size for input rowset
Default value: true

`max_base_compaction_threads`

Type: int32
Description: The maximum of thread number in base compaction thread pool.
Default value: 4

`generate_compaction_tasks_interval_ms`

Description: Minimal interval (ms) to generate compaction tasks
Default value: 10 (ms)

`base_compaction_min_rowset_num`

Description: One of the triggering conditions of BaseCompaction: The limit of the number of Cumulative files to be reached. After reaching this limit, BaseCompaction will be triggered
Default value: 5

`base_compaction_min_data_ratio`

Description: One of the trigger conditions of BaseCompaction: Cumulative file size reaches the proportion of Base file
Default value: 0.3 (30%)

`total_permits_for_compaction_score`

Type: int64
Description: The upper limit of “permits” held by all compaction tasks. This config can be set to limit memory consumption for compaction.
Default value: 10000
Dynamically modifiable: Yes

`compaction_promotion_size_mbytes`

Type: int64
Description: The total disk size of the output rowset of cumulative compaction exceeds this configuration size, and the rowset will be used for base compaction. The unit is m bytes.
- Generally, if the configuration is less than 2G, in order to prevent the cumulative compression time from being too long, resulting in the version backlog.
Default value: 1024

`compaction_promotion_ratio`

Type: double
Description: When the total disk size of the cumulative compaction output rowset exceeds the configuration ratio of the base version rowset, the rowset will be used for base compaction.
- Generally, it is recommended that the configuration should not be higher than 0.1 and lower than 0.02.
Default value: 0.05

`compaction_promotion_min_size_mbytes`

Type: int64
Description: If the total disk size of the output rowset of the cumulative compaction is lower than this configuration size, the rowset will not undergo base compaction and is still in the cumulative compaction process. The unit is m bytes.
- Generally, the configuration is within 512m. If the configuration is too large, the size of the early base version is too small, and base compaction has not been performed.
Default value: 64

`compaction_min_size_mbytes`

Type: int64
Description: When the cumulative compaction is merged, the selected rowsets to be merged have a larger disk size than this configuration, then they are divided and merged according to the level policy. When it is smaller than this configuration, merge directly. The unit is m bytes.
- Generally, the configuration is within 128m. Over configuration will cause more cumulative compaction write amplification.
Default value: 64

`default_rowset_type`

Type: string
Description: Identifies the storage format selected by BE by default. The configurable parameters are: “ALPHA“, “BETA“. Mainly play the following two roles
- When the storage_format of the table is set to Default, select the storage format of BE through this configuration.
- Select the storage format of when BE performing Compaction
Default value: BETA

`cumulative_compaction_min_deltas`

Description: Cumulative compaction strategy: the minimum number of incremental files
Default value: 5

`cumulative_compaction_max_deltas`

Description: Cumulative compaction strategy: the maximum number of incremental files
Default value: 1000

`base_compaction_trace_threshold`

Type: int32
Description: Threshold to logging base compaction’s trace information, in seconds
Default value: 10

Base compaction is a long time cost background task, this configuration is the threshold to logging trace information. Trace information in log file looks like:

W0610 11:26:33.804431 56452 storage_engine.cpp:552] Trace:
0610 11:23:03.727535 (+     0us) storage_engine.cpp:554] start to perform base compaction
0610 11:23:03.728961 (+  1426us) storage_engine.cpp:560] found best tablet 546859
0610 11:23:03.728963 (+     2us) base_compaction.cpp:40] got base compaction lock
0610 11:23:03.729029 (+    66us) base_compaction.cpp:44] rowsets picked
0610 11:24:51.784439 (+108055410us) compaction.cpp:46] got concurrency lock and start to do compaction
0610 11:24:51.784818 (+   379us) compaction.cpp:74] prepare finished
0610 11:26:33.359265 (+101574447us) compaction.cpp:87] merge rowsets finished
0610 11:26:33.484481 (+125216us) compaction.cpp:102] output rowset built
0610 11:26:33.484482 (+     1us) compaction.cpp:106] check correctness finished
0610 11:26:33.513197 (+ 28715us) compaction.cpp:110] modify rowsets finished
0610 11:26:33.513300 (+   103us) base_compaction.cpp:49] compaction finished
0610 11:26:33.513441 (+   141us) base_compaction.cpp:56] unused rowsets have been moved to GC queue
Metrics: {"filtered_rows":0,"input_row_num":3346807,"input_rowsets_count":42,"input_rowsets_data_size":1256413170,"input_segments_num":44,"merge_rowsets_latency_us":101574444,"merged_rows":0,"output_row_num":3346807,"output_rowset_data_size":1228439659,"output_segments_num":6}

`cumulative_compaction_trace_threshold`

Type: int32
Description: Threshold to logging cumulative compaction’s trace information, in seconds
- Similar to base_compaction_trace_threshold.
Default value: 2

`compaction_task_num_per_disk`

Type: int32
Description: The number of compaction tasks which execute in parallel for a disk(HDD).
Default value: 2

`compaction_task_num_per_fast_disk`

Type: int32
Description: The number of compaction tasks which execute in parallel for a fast disk(SSD).
Default value: 4

`cumulative_compaction_rounds_for_each_base_compaction_round`

Type: int32
Description: How many rounds of cumulative compaction for each round of base compaction when compaction tasks generation.
Default value: 9

`cumulative_compaction_policy`

Type: string
Description: Configure the merge strategy in the cumulative compression phase. Currently, two merge strategies are implemented, num_based and size_based
- For details, “ordinary” is the initial version of the cumulative compression consolidation policy. After a cumulative compression, the base compression process is directly performed. size_The general policy is the optimized version of the ordinary policy. Version merging can only be performed when the disk volume of the rowset is the same order of magnitude. After merging, qualified rowsets are promoted to the base compaction stage. In the case of a large number of small batch imports, it can reduce the write magnification of base compact, balance the read magnification and space magnification, and reduce the data of file versions.
Default value: size_based

`max_cumu_compaction_threads`

Type: int32
Description: The maximum of thread number in cumulative compaction thread pool.
Default value: 10

`enable_segcompaction`

Type: bool
Description: Enable to use segment compaction during loading
Default value: false

`segcompaction_threshold_segment_num`

Type: int32
Description: Trigger segcompaction if the num of segments in a rowset exceeds this threshold
Default value: 10

`segcompaction_small_threshold`

Type: int32
Description: The segment whose row number above the threshold will be compacted during segcompaction
Default value: 1048576

`disable_compaction_trace_log`

Type: bool
Description: disable the trace log of compaction
- If set to true, the cumulative_compaction_trace_threshold and base_compaction_trace_threshold won’t work and log is disabled.
Default value: true

Load

`enable_stream_load_record`

Type: bool
Description:Whether to enable stream load record function, the default is false.
Default value: false

`load_data_reserve_hours`

Description: Used for mini load. The mini load data file will be deleted after this time
Default value: 4 (h)

`push_worker_count_high_priority`

Description: Import the number of threads for processing HIGH priority tasks
Default value: 3

`push_worker_count_normal_priority`

Description: Import the number of threads for processing NORMAL priority tasks
Default value: 3

`load_error_log_reserve_hours`

Description: The load error log will be deleted after this time
Default value: 48 (h)

`load_process_max_memory_limit_percent`

Description: The percentage of the upper memory limit occupied by all imported threads on a single node, the default is 50%
- Set these default values very large, because we don’t want to affect load performance when users upgrade Doris. If necessary, the user should set these configurations correctly
Default value: 50 (%)

`load_process_soft_mem_limit_percent`

Description: The soft limit refers to the proportion of the load memory limit of a single node. For example, the load memory limit for all load tasks is 20GB, and the soft limit defaults to 50% of this value, that is, 10GB. When the load memory usage exceeds the soft limit, the job with the largest memory consuption will be selected to be flushed to release the memory space, the default is 50%
Default value: 50 (%)

`routine_load_thread_pool_size`

Description: The thread pool size of the routine load task. This should be greater than the FE configuration’max_concurrent_task_num_per_be’
Default value: 10

`single_replica_load_brpc_num_threads`

Type: int32
Description: This configuration is mainly used to modify the number of bthreads for single replica load brpc. When the load concurrency increases, you can adjust this parameter to ensure that the Slave replica synchronizes data files from the Master replica timely.
Default value: 64

`single_replica_load_download_num_workers`

Type: int32
Description:This configuration is mainly used to modify the number of http threads for segment download, used for single replica load. When the load concurrency increases, you can adjust this parameter to ensure that the Slave replica synchronizes data files from the Master replica timely.
Default value: 64

`slave_replica_writer_rpc_timeout_sec`

Type: int32
Description: This configuration is mainly used to modify timeout of brpc between master replica and slave replica, used for single replica load.
Default value: 60

`max_segment_num_per_rowset`

Type: int32
Description: Used to limit the number of segments in the newly generated rowset when importing. If the threshold is exceeded, the import will fail with error -238. Too many segments will cause compaction to take up a lot of memory and cause OOM errors.
Default value: 200

`high_priority_flush_thread_num_per_store`

Type: int32
Description: The number of flush threads per store path allocated for the high priority import task.
Default value: 1

`routine_load_consumer_pool_size`

Type: int32
Description: The number of caches for the data consumer used by the routine load.
Default value: 10

`load_task_high_priority_threshold_second`

Type: int32
Description: When the timeout of an import task is less than this threshold, Doris will consider it to be a high priority task. High priority tasks use a separate pool of flush threads.
Default: 120

`min_load_rpc_timeout_ms`

Type: int32
Description: The minimum timeout for each rpc in the load job.
Default: 20

`kafka_api_version_request`

Type: bool
Description: If the dependent Kafka version is lower than 0.10.0.0, this value should be set to false.
Default: true

`kafka_broker_version_fallback`

Description: If the dependent Kafka version is lower than 0.10.0.0, the value set by the fallback version kafka_broker_version_fallback will be used if the value of kafka_api_version_request is set to false, and the valid values are: 0.9.0.x, 0.8.x.y.
Default: 0.10.0

`max_consumer_num_per_group`

Description: The maximum number of consumers in a data consumer group, used for routine load
Default: 3

`streaming_load_max_mb`

Type: int64
Description: Used to limit the maximum amount of csv data allowed in one Stream load.
- Stream Load is generally suitable for loading data less than a few GB, not suitable for loading` too large data.
Default value: 10240 (MB)
Dynamically modifiable: Yes

`streaming_load_json_max_mb`

Type: int64
Description: it is used to limit the maximum amount of json data allowed in one Stream load. The unit is MB.
- Some data formats, such as JSON, cannot be split. Doris must read all the data into the memory before parsing can begin. Therefore, this value is used to limit the maximum amount of data that can be loaded in a single Stream load.
Default value: 100
Dynamically modifiable: Yes

Thread

`delete_worker_count`

Description: Number of threads performing data deletion tasks
Default value: 3

`clear_transaction_task_worker_count`

Description: Number of threads used to clean up transactions
Default value: 1

`clone_worker_count`

Description: Number of threads used to perform cloning tasks
Default value: 3

`be_service_threads`

Type: int32
Description: The number of execution threads of the thrift server service on BE which represents the number of threads that can be used to execute FE requests.
Default value: 64

`download_worker_count`

Description: The number of download threads.
Default value: 1

`drop_tablet_worker_count`

Description: Number of threads to delete tablet
Default value: 3

`flush_thread_num_per_store`

Description: The number of threads used to refresh the memory table per store
Default value: 2

`num_threads_per_core`

Description: Control the number of threads that each core runs. Usually choose 2 times or 3 times the number of cores. This keeps the core busy without causing excessive jitter
Default value: 3

`num_threads_per_disk`

Description: The maximum number of threads per disk is also the maximum queue depth of each disk
Default value: 0

`number_slave_replica_download_threads`

Description: Number of threads for slave replica synchronize data, used for single replica load.
Default value: 64

`publish_version_worker_count`

Description: the count of thread to publish version
Default value: 8

`upload_worker_count`

Description: Maximum number of threads for uploading files
Default value: 1

`webserver_num_workers`

Description: Webserver default number of worker threads
Default value: 48

`send_batch_thread_pool_thread_num`

Type: int32
Description: The number of threads in the SendBatch thread pool. In NodeChannels’ sending data tasks, the SendBatch operation of each NodeChannel will be submitted as a thread task to the thread pool to be scheduled. This parameter determines the size of the SendBatch thread pool.
Default value: 64

`send_batch_thread_pool_queue_size`

Type: int32
Description: The queue length of the SendBatch thread pool. In NodeChannels’ sending data tasks, the SendBatch operation of each NodeChannel will be submitted as a thread task to the thread pool waiting to be scheduled, and after the number of submitted tasks exceeds the length of the thread pool queue, subsequent submitted tasks will be blocked until there is a empty slot in the queue.
Default value: 102400

`make_snapshot_worker_count`

Description: Number of threads making snapshots
Default value: 5

`release_snapshot_worker_count`

Description: Number of threads releasing snapshots
Default value: 5

Memory

`disable_mem_pools`

Type: bool
Description: Whether to disable the memory cache pool.
Default value: false

`buffer_pool_clean_pages_limit`

Description: Clean up pages that may be saved by the buffer pool
Default value: 50%

`buffer_pool_limit`

Type: string
Description: The largest allocatable memory of the buffer pool
- The maximum amount of memory available in the BE buffer pool. The buffer pool is a new memory management structure of BE, which manages the memory by the buffer page and enables spill data to disk. The memory for all concurrent queries will be allocated from the buffer pool. The current buffer pool only works on AggregationNode and ExchangeNode.
Default value: 20%

`chunk_reserved_bytes_limit`

Description: The reserved bytes limit of Chunk Allocator, usually set as a percentage of mem_limit. defaults to bytes if no unit is given, the number of bytes must be a multiple of 2. must larger than 0. and if larger than physical memory size, it will be set to physical memory size. increase this variable can improve performance, but will acquire more free memory which can not be used by other modules.
Default value: 20%

`madvise_huge_pages`

Type: bool
Description: Whether to use linux memory huge pages.
Default value: false

`max_memory_sink_batch_count`

Description: The maximum external scan cache batch count, which means that the cache max_memory_cache_batch_count batch_size row, the default is 20, and the default value of batch_size is 1024, which means that 20 1024 rows will be cached
Default value: 20

`memory_limitation_per_thread_for_schema_change`

Description: The maximum memory allowed for a single schema change task
Default value: 2 (GB)

`memory_max_alignment`

Description: Maximum alignment memory
Default value: 16

`mmap_buffers`

Description: Whether to use mmap to allocate memory
Default value: false

`download_cache_buffer_size`

Type: int64
Description: The size of the buffer used to receive data when downloading the cache.
Default value: 10485760

`zone_map_row_num_threshold`

Type: int32
Description: If the number of rows in a page is less than this value, no zonemap will be created to reduce data expansion
Default value: 20

`enable_tcmalloc_hook`

Type: bool
Description: Whether Hook TCmalloc new/delete, currently consume/release tls mem tracker in Hook.
Default value: true

`memory_mode`

Type: string
Description: Control gc of tcmalloc, in performance mode doirs releases memory of tcmalloc cache when usgae >= 90% mem_limit, otherwise, doris releases memory of tcmalloc cache when usage >= 50% mem_limit;
Default value: performance

`max_sys_mem_available_low_water_mark_bytes`

Type: int64
Description: The maximum low water mark of the system /proc/meminfo/MemAvailable, Unit byte, default 1.6G, actual low water mark=min(1.6G, MemTotal * 10%), avoid wasting too much memory on machines with large memory larger than 16G. Turn up max. On machines with more than 16G memory, more memory buffers will be reserved for Full GC. Turn down max. will use as much memory as possible.
Default value: 1717986918

`memory_limitation_per_thread_for_schema_change_bytes`

Description: Maximum memory allowed for a single schema change task
Default value: 2147483648

`mem_tracker_consume_min_size_bytes`

Type: int32
Description: The minimum length of TCMalloc Hook when consume/release MemTracker. Consume size smaller than this value will continue to accumulate to avoid frequent calls to consume/release of MemTracker. Decreasing this value will increase the frequency of consume/release. Increasing this value will cause MemTracker statistics to be inaccurate. Theoretically, the statistical value of a MemTracker differs from the true value = ( mem_tracker_consume_min_size_bytes * the number of BE threads where the MemTracker is located).
Default value: 1,048,576

`cache_clean_interval`

Description: File handle cache cleaning interval, used to clean up file handles that have not been used for a long time.Also the clean interval of Segment Cache.
Default value: 1800 (s)

`min_buffer_size`

Description: Minimum read buffer size
Default value: 1024 (byte)

`write_buffer_size`

Description: The size of the buffer before flashing
- Imported data is first written to a memory block on the BE, and only written back to disk when this memory block reaches the threshold. The default size is 100MB. too small a threshold may result in a large number of small files on the BE. This threshold can be increased to reduce the number of files. However, too large a threshold may cause RPC timeouts
Default value: 104,857,600

`remote_storage_read_buffer_mb`

Type: int32
Description: The cache size used when reading files on hdfs or object storage.
- Increasing this value can reduce the number of calls to read remote data, but it will increase memory overhead.
Default value: 16MB

`segment_cache_capacity`

Type: int32
Description: The maximum number of Segments cached by Segment Cache.
- The default value is currently only an empirical value, and may need to be modified according to actual scenarios. Increasing this value can cache more segments and avoid some IO. Decreasing this value will reduce memory usage.
Default value: 1000000

`file_cache_type`

Type: string
Description: Type of cache file.whole_file_cache: download the entire segment file, sub_file_cache: the segment file is divided into multiple files by size. if set “”, no cache, please set this parameter when caching is required.
Default value: “”

`file_cache_alive_time_sec`

Type: int64
Description: Save time of cache file
Default value: 604800 (1 week)

`file_cache_max_size_per_disk`

Type: int64
Description: The cache occupies the disk size. Once this setting is exceeded, the cache that has not been accessed for the longest time will be deleted. If it is 0, the size is not limited. unit is bytes.
Default value: 0

`max_sub_cache_file_size`

Type: int64
Description: Cache files using sub file The maximum size of the split file during cache
Default value: 104857600 (100MB)

`download_cache_thread_pool_thread_num`

Type: int32
Description: The number of threads in the DownloadCache thread pool. In the download cache task of FileCache, the download cache operation will be submitted to the thread pool as a thread task and wait to be scheduled. This parameter determines the size of the DownloadCache thread pool.
Default value: 48

`download_cache_thread_pool_queue_size`

Type: int32
Description: The number of threads in the DownloadCache thread pool. In the download cache task of FileCache, the download cache operation will be submitted to the thread pool as a thread task and wait to be scheduled. After the number of submitted tasks exceeds the length of the thread pool queue, subsequent submitted tasks will be blocked until there is a empty slot in the queue.
Default value: 102400

`generate_cache_cleaner_task_interval_sec`

Type：int64
Description：Cleaning interval of cache files, in seconds
Default：43200（12 hours）

`path_gc_check`

Type：bool
Description：Whether to enable the recycle scan data thread check
Default：true

`path_gc_check_interval_second`

Description：Recycle scan data thread check interval
Default：86400 (s)

`path_gc_check_step`

Default：1000

`path_gc_check_step_interval_ms`

Default：10 (ms)

`path_scan_interval_second`

Default：86400

`scan_context_gc_interval_min`

Description：This configuration is used for the context gc thread scheduling cycle. Note: The unit is minutes, and the default is 5 minutes
Default：5

Storage

`default_num_rows_per_column_file_block`

Type: int32
Description: Configure how many rows of data are contained in a single RowBlock.
Default value: 1024

`disable_storage_page_cache`

Type: bool
Description: Disable to use page cache for index caching, this configuration only takes effect in BETA storage format, usually it is recommended to false
Default value: false

`disk_stat_monitor_interval`

Description: Disk status check interval
Default value: 5（s）

`max_free_io_buffers`

Description: For each io buffer size, the maximum number of buffers that IoMgr will reserve ranges from 1024B to 8MB buffers, up to about 2GB buffers.
Default value: 128

`max_garbage_sweep_interval`

Description: The maximum interval for disk garbage cleaning
Default value: 3600 (s)

`max_percentage_of_error_disk`

Type: int32
Description: The storage engine allows the percentage of damaged hard disks to exist. After the damaged hard disk exceeds the changed ratio, BE will automatically exit.
Default value: 0

`read_size`

Description: The read size is the read size sent to the os. There is a trade-off between latency and the whole process, getting to keep the disk busy but not introducing seeks. For 8 MB reads, random io and sequential io have similar performance.
Default value: 8388608

`min_garbage_sweep_interval`

Description: The minimum interval between disk garbage cleaning
Default value: 180 (s)

`pprof_profile_dir`

Description: pprof profile save directory
Default value: ${DORIS_HOME}/log

`small_file_dir`

Description: 用于保存 SmallFileMgr 下载的文件的目录
Default value: ${DORIS_HOME}/lib/small_file/

`user_function_dir`

Description: udf function directory
Default value: ${DORIS_HOME}/lib/udf

`storage_flood_stage_left_capacity_bytes`

Description: The min bytes that should be left of a data dir.
Default value: 1073741824

`storage_flood_stage_usage_percent`

Description: The storage_flood_stage_usage_percent and storage_flood_stage_left_capacity_bytes configurations limit the maximum usage of the capacity of the data directory.
Default value: 90 （90%）

`storage_medium_migrate_count`

Description: the count of thread to clone
Default value: 1

`storage_page_cache_limit`

Description: Cache for storage page size
Default value: 20%

`storage_page_cache_shard_size`

Description: Shard size of StoragePageCache, the value must be power of two. It’s recommended to set it to a value close to the number of BE cores in order to reduce lock contentions.
Default value: 16

`index_page_cache_percentage`

Type: int32
Description: Index page cache as a percentage of total storage page cache, value range is [0, 100]
Default value: 10

`storage_strict_check_incompatible_old_format`

Type: bool
Description: Used to check incompatible old format strictly
Default value: true
Dynamically modify: false

`sync_tablet_meta`

Description: Whether the storage engine opens sync and keeps it to the disk
Default value: false

`pending_data_expire_time_sec`

Description: The maximum duration of unvalidated data retained by the storage engine
Default value: 1800 (s)

`ignore_rowset_stale_unconsistent_delete`

Type: boolean
Description:It is used to decide whether to delete the outdated merged rowset if it cannot form a consistent version path.
- The merged expired rowset version path will be deleted after half an hour. In abnormal situations, deleting these versions will result in the problem that the consistent path of the query cannot be constructed. When the configuration is false, the program check is strict and the program will directly report an error and exit.When configured as true, the program will run normally and ignore this error. In general, ignoring this error will not affect the query, only when the merged version is dispatched by fe, -230 error will appear.
Default value: false

`create_tablet_worker_count`

Description: Number of worker threads for BE to create a tablet
Default value: 3

`check_consistency_worker_count`

Description: The number of worker threads to calculate the checksum of the tablet
Default value: 1

`max_tablet_version_num`

Type: int
Description: Limit the number of versions of a single tablet. It is used to prevent a large number of version accumulation problems caused by too frequent import or untimely compaction. When the limit is exceeded, the import task will be rejected.
Default value: 500

`number_tablet_writer_threads`

Description: Number of tablet write threads
Default value: 16

`tablet_map_shard_size`

Description: tablet_map_lock fragment size, the value is 2^n, n=0,1,2,3,4, this is for better tablet management
Default value: 1

`tablet_meta_checkpoint_min_interval_secs`

Description: TabletMeta Checkpoint线程轮询的时间间隔
Default value: 600 (s)

`tablet_meta_checkpoint_min_new_rowsets_num`

Description: The minimum number of Rowsets for storing TabletMeta Checkpoints
Default value: 10

`tablet_stat_cache_update_interval_second`

Description: Update interval of tablet state cache
Default value:300 (s)

`tablet_rowset_stale_sweep_time_sec`

Type: int64
Description: It is used to control the expiration time of cleaning up the merged rowset version. When the current time now() minus the max created rowset‘s create time in a version path is greater than tablet_rowset_stale_sweep_time_sec, the current path is cleaned up and these merged rowsets are deleted, the unit is second.
- When writing is too frequent and the disk time is insufficient, you can configure less tablet_rowset_stale_sweep_time_sec. However, if this time is less than 5 minutes, it may cause fe to query the version that has been merged, causing a query -230 error.
Default value: 1800

`tablet_writer_open_rpc_timeout_sec`

Description: Update interval of tablet state cache
- The RPC timeout for sending a Batch (1024 lines) during import. The default is 60 seconds. Since this RPC may involve writing multiple batches of memory, the RPC timeout may be caused by writing batches, so this timeout can be adjusted to reduce timeout errors (such as send batch fail errors). Also, if you increase the write_buffer_size configuration, you need to increase this parameter as well.
Default value: 60

`tablet_writer_ignore_eovercrowded`

Type: bool
Description: Used to ignore brpc error ‘[E1011]The server is overcrowded’ when writing data.
Default value: false

`streaming_load_rpc_max_alive_time_sec`

Description: The lifetime of TabletsChannel. If the channel does not receive any data at this time, the channel will be deleted.
Default value: 1200

`alter_tablet_worker_count`

Description: The number of threads making schema changes
Default value: 3

`ignore_load_tablet_failure`

Type: bool
Description: It is used to decide whether to ignore errors and continue to start be in case of tablet loading failure
Default value: false

When BE starts, a separate thread will be started for each data directory to load the meta information of the tablet header. In the default configuration, if a data directory fails to load a tablet, the startup process will terminate. At the same time, it will be displayed in the be The following error message is seen in the INFO log:

load tablets from header failed, failed tablets size: xxx, path=xxx

Indicates how many tablets failed to load in the data directory. At the same time, the log will also contain specific information about the tablets that failed to load. At this time, manual intervention is required to troubleshoot the cause of the error. After troubleshooting, there are usually two ways to restore:

The tablet information cannot be repaired. If the other copies are normal, you can delete the wrong tablet with the meta_tool tool.
Set ignore_load_tablet_failure to true, BE will ignore these faulty tablets and start normally

`report_disk_state_interval_seconds`

Description: The interval time for the agent to report the disk status to FE
Default value: 60 (s)

`result_buffer_cancelled_interval_time`

Description: Result buffer cancellation time
Default value: 300 (s)

`snapshot_expire_time_sec`

Description: Snapshot file cleaning interval.
Default value:172800 (48 hours)

`compress_rowbatches`

Type: bool
Description: enable to use Snappy compression algorithm for data compression when serializing RowBatch
Default value: true

SinceVersion 1.2

`jvm_max_heap_size`

Type: string
Description: The maximum size of JVM heap memory used by BE, which is the -Xmx parameter of JVM
Default value: 1024M

Log

`sys_log_dir`

Type: string
Description: Storage directory of BE log data
Default value: ${DORIS_HOME}/log

`sys_log_level`

Description: Log Level: INFO < WARNING < ERROR < FATAL
Default value: INFO

`sys_log_roll_mode`

Description: The size of the log split, one log file is split every 1G
Default value: SIZE-MB-1024

`sys_log_roll_num`

Description: Number of log files kept
Default value: 10

`sys_log_verbose_level`

Description: Log display level, used to control the log output at the beginning of VLOG in the code
Default value: 10

`sys_log_verbose_modules`

Description: Log printing module, writing olap will only print the log under the olap module
Default value: 空

`aws_log_level`

Type: int32

Description: log level of AWS SDK,

   Off = 0,
   Fatal = 1,
   Error = 2,
   Warn = 3,
   Info = 4,
   Debug = 5,
   Trace = 6

Default value: 3

`log_buffer_level`

Description: The log flushing strategy is kept in memory by default
Default value: 空

Else

`report_tablet_interval_seconds`

Description: The interval time for the agent to report the olap table to the FE
Default value: 60 (s)

`report_task_interval_seconds`

Description: The interval time for the agent to report the task signature to FE
Default value: 10 (s)

`periodic_counter_update_period_ms`

Description: Update rate counter and sampling counter cycle
Default value: 500 (ms)

`enable_metric_calculator`

Description: If set to true, the metric calculator will run to collect BE-related indicator information, if set to false, it will not run
Default value: true

`enable_system_metrics`

Description: User control to turn on and off system indicators.
Default value: true

`enable_token_check`

Description: Used for forward compatibility, will be removed later.
Default value: true

`max_runnings_transactions_per_txn_map`

Description: Max number of txns for every txn_partition_map in txn manager, this is a self protection to avoid too many txns saving in manager
Default value: 100

`max_download_speed_kbps`

Description: Maximum download speed limit
Default value: 50000 （kb/s）

`download_low_speed_time`

Description: Download time limit
Default value: 300 (s)

`download_low_speed_limit_kbps`

Description: Minimum download speed
Default value: 50 (KB/s)

`doris_cgroups`

Description: Cgroups assigned to doris
Default value: empty

`row_nums_check`

Description: Check row nums for BE/CE and schema change
Default value: true

`priority_queue_remaining_tasks_increased_frequency`

Description: the increased frequency of priority for remaining tasks in BlockingPriorityQueue
Default value: 512

SinceVersion 1.2

`jdbc_drivers_dir`

Description: Default dirs to put jdbc drivers.
Default value: ${DORIS_HOME}/jdbc_drivers

`enable_parse_multi_dimession_array`

Description: Whether parse multidimensional array, if false encountering will return ERROR
Default value: true