Common Config Manual

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Common Configuration
- Effective
- Configuration File

Common Configuration

IoTDB common files for ConfigNode and DataNode are under conf.

iotdb-common.properties：IoTDB common configurations.

Effective

Different configuration parameters take effect in the following three ways:

Only allowed to be modified in first start up: Can’t be modified after first start, otherwise the ConfigNode/DataNode cannot start.
After restarting system: Can be modified after the ConfigNode/DataNode first start, but take effect after restart.
hot-load: Can be modified while the ConfigNode/DataNode is running, and trigger through sending the command(sql) load configuration to the IoTDB server by client or session.

Configuration File

Replication Configuration

config_node_consensus_protocol_class

Name	config_node_consensus_protocol_class
Description	Consensus protocol of ConfigNode replicas, only support RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.ratis.RatisConsensus
Effective	Only allowed to be modified in first start up

schema_replication_factor

Name	schema_replication_factor
Description	Schema replication num
Type	int32
Default	1
Effective	Take effect on new created Databases after restarting system

schema_region_consensus_protocol_class

Name	schema_region_consensus_protocol_class
Description	Consensus protocol of schema replicas, SimpleConsensus could only be used in 1 replica，larger than 1 replicas could only use RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.ratis.RatisConsensus
Effective	Only allowed to be modified in first start up

data_replication_factor

Name	data_replication_factor
Description	Data replication num
Type	int32
Default	1
Effective	Take effect on new created Databases after restarting system

data_region_consensus_protocol_class

Name	data_region_consensus_protocol_class
Description	Consensus protocol of data replicas, SimpleConsensus could only be used in 1 replica，larger than 1 replicas could use IoTConsensus or RatisConsensus
Type	String
Default	org.apache.iotdb.consensus.simple.SimpleConsensus
Effective	Only allowed to be modified in first start up

Load balancing Configuration

series_partition_slot_num

Name	series_slot_num
Description	Slot num of series partition
Type	int32
Default	10000
Effective	Only allowed to be modified in first start up

series_partition_executor_class

Name	series_partition_executor_class
Description	Series partition hash function
Type	String
Default	org.apache.iotdb.commons.partition.executor.hash.BKDRHashExecutor
Effective	Only allowed to be modified in first start up

schema_region_per_data_node

Name	schema_region_per_data_node
Description	The maximum number of SchemaRegion expected to be managed by each DataNode
Type	double
Default	1.0
Effective	After restarting system

data_region_group_extension_policy

Name	data_region_group_extension_policy
Description	The extension policy of DataRegionGroup
Type	string
Default	AUTO
Effective	After restarting system

data_region_group_per_database

Name	data_region_group_per_database
Description	The number of DataRegionGroups that each Database has when using the CUSTOM-DataRegionGroup extension policy
Type	int
Default	1
Effective	After restarting system

data_region_per_processor

Name	data_region_per_processor
Description	The maximum number of DataRegion expected to be managed by each processor
Type	double
Default	1.0
Effective	After restarting system

least_data_region_group_num

Name	least_data_region_group_num
Description	The least number of DataRegionGroup for each Database
Type	int
Default	5
Effective	After restarting system

enable_data_partition_inherit_policy

Name	enable_data_partition_inherit_policy
Description	Whether to enable the DataPartition inherit policy
Type	Boolean
Default	false
Effective	After restarting system

leader_distribution_policy

Name	leader_distribution_policy
Description	The policy of cluster RegionGroups’ leader distribution
Type	String
Default	MIN_COST_FLOW
Effective	After restarting system

enable_auto_leader_balance_for_ratis

Name	enable_auto_leader_balance_for_ratis_consensus
Description	Whether to enable auto leader balance for Ratis consensus protocol
Type	Boolean
Default	false
Effective	After restarting system

enable_auto_leader_balance_for_iot_consensus

Name	enable_auto_leader_balance_for_iot_consensus
Description	Whether to enable auto leader balance for IoTConsensus protocol
Type	Boolean
Default	true
Effective	After restarting system

Cluster Management

time_partition_interval

Name	time_partition_interval
Description	Time partition interval of data when ConfigNode allocate data
Type	Long
Unit	ms
Default	604800000
Effective	Only allowed to be modified in first start up

heartbeat_interval_in_ms

Name	heartbeat_interval_in_ms
Description	Heartbeat interval in the cluster nodes
Type	Long
Unit	ms
Default	1000
Effective	After restarting system

disk_space_warning_threshold

Name	disk_space_warning_threshold
Description	Disk remaining threshold
Type	double(percentage)
Default	0.05
Effective	After restarting system

Memory Control Configuration

enable_mem_control

Name	enable_mem_control
Description	enable memory control to avoid OOM
Type	Boolean
Default	true
Effective	After restarting system

storage_query_schema_consensus_free_memory_proportion

Name	storage_query_schema_consensus_free_memory_proportion
Description	Memory Allocation Ratio: StorageEngine, QueryEngine, SchemaEngine, Consensus and Free Memory
Type	Ratio
Default	3:3:1:1:2
Effective	After restarting system

schema_memory_allocate_proportion

Name	schema_memory_allocate_proportion
Description	Schema Memory Allocation Ratio: SchemaRegion, SchemaCache, PartitionCache and LastCache
Type	Ratio
Default	5:3:1:1
Effective	After restarting system

storage_engine_memory_proportion

Name	storage_engine_memory_proportion
Description	Memory allocation ratio in StorageEngine: Write, Compaction
Type	Ratio
Default	8:2
Effective	After restarting system

write_memory_proportion

Name	write_memory_proportion
Description	Memory allocation ratio in writing: Memtable, TimePartitionInfo
Type	Ratio
Default	19:1
Effective	After restarting system

concurrent_writing_time_partition

Name	concurrent_writing_time_partition
Description	This config decides how many time partitions in a database can be inserted concurrently For example, your partitionInterval is 86400 and you want to insert data in 5 different days,
Type	int32
Default	1
Effective	After restarting system

primitive_array_size

Name	primitive_array_size
Description	primitive array size (length of each array) in array pool
Type	Int32
Default	64
Effective	After restart system

chunk_metadata_size_proportion

Name	chunk_metadata_size_proportion
Description	size proportion for chunk metadata maintains in memory when writing tsfile
Type	Double
Default	0.1
Effective	After restart system

flush_proportion

Name	flush_proportion
Description	Ratio of write memory for invoking flush disk, 0.4 by default If you have extremely high write load (like batch=1000), it can be set lower than the default value like 0.2
Type	Double
Default	0.4
Effective	After restart system

buffered_arrays_memory_proportion

Name	buffered_arrays_memory_proportion
Description	Ratio of write memory allocated for buffered arrays
Type	Double
Default	0.6
Effective	After restart system

reject_proportion

Name	reject_proportion
Description	Ratio of write memory for rejecting insertion
Type	Double
Default	0.8
Effective	After restart system

write_memory_variation_report_proportion

Name	write_memory_variation_report_proportion
Description	if memory cost of data region increased more than proportion of allocated memory for write, report to system
Type	Double
Default	0.001
Effective	After restarting system

check_period_when_insert_blocked

Name	check_period_when_insert_blocked
Description	when an inserting is rejected, waiting period (in ms) to check system again
Type	Int32
Default	50
Effective	After restart system

io_task_queue_size_for_flushing

Name	io_task_queue_size_for_flushing
Description	size of ioTaskQueue. The default value is 10
Type	Int32
Default	10
Effective	After restart system

enable_query_memory_estimation

Name	enable_query_memory_estimation
Description	If true, we will estimate each query’s possible memory footprint before executing it and deny it if its estimated memory exceeds current free memory
Type	bool
Default	true
Effective	hot-load

partition_cache_size

Name	partition_cache_size
Description	The max num of partition info record cached on DataNode.
Type	Int32
Default	1000
Effective	After restarting system

Schema Engine Configuration

mlog_buffer_size

Name	mlog_buffer_size
Description	size of log buffer in each metadata operation plan(in byte)
Type	int32
Default	1048576
Effective	After restart system

sync_mlog_period_in_ms

Name	sync_mlog_period_in_ms
Description	The cycle when metadata log is periodically forced to be written to disk(in milliseconds). If force_mlog_period_in_ms = 0 it means force metadata log to be written to disk after each refreshment
Type	Int64
Default	100
Effective	After restarting system

tag_attribute_flush_interval

Name	tag_attribute_flush_interval
Description	interval num for tag and attribute records when force flushing to disk. When a certain amount of tag and attribute records is reached, they will be force flushed to disk. It is possible to lose at most tag_attribute_flush_interval records
Type	int32
Default	1000
Effective	Only allowed to be modified in first start up

tag_attribute_total_size

Name	tag_attribute_total_size
Description	The maximum persistence size of tags and attributes of each time series.
Type	int32
Default	700
Effective	Only allowed to be modified in first start up

schema_region_device_node_cache_size

Name	schema_region_device_node_cache_size
Description	The max num of device node, used for speeding up device query, cached in schemaRegion.
Type	Int32
Default	10000
Effective	After restarting system

max_measurement_num_of_internal_request

Name	max_measurement_num_of_internal_request
Description	When there’s too many measurements in one create timeseries plan, the plan will be split to several sub plan, with measurement num no more than this param.
Type	Int32
Default	10000
Effective	After restarting system

Configurations for creating schema automatically

enable_auto_create_schema

Name	enable_auto_create_schema
Description	whether auto create the time series when a non-existed time series data comes
Type	true or false
Default	true
Effective	After restarting system

default_storage_group_level

Name	default_storage_group_level
Description	Database level when creating schema automatically is enabled. For example, if we receives a data point from root.sg0.d1.s2, we will set root.sg0 as the database if database level is 1. (root is level 0)
Type	integer
Default	1
Effective	After restarting system

boolean_string_infer_type

Name	boolean_string_infer_type
Description	To which type the values “true” and “false” should be reslved
Type	BOOLEAN or TEXT
Default	BOOLEAN
Effective	After restarting system

integer_string_infer_type

Name	integer_string_infer_type
Description	To which type an integer string like “67” in a query should be resolved
Type	INT32, INT64, DOUBLE, FLOAT or TEXT
Default	DOUBLE
Effective	After restarting system

floating_string_infer_type

Name	floating_string_infer_type
Description	To which type a floating number string like “6.7” in a query should be resolved
Type	DOUBLE, FLOAT or TEXT
Default	FLOAT
Effective	After restarting system

nan_string_infer_type

Name	nan_string_infer_type
Description	To which type the value NaN in a query should be resolved
Type	DOUBLE, FLOAT or TEXT
Default	FLOAT
Effective	After restarting system

Query Configurations

read_consistency_level

Name	mpp_data_exchange_core_pool_size
Description	The read consistency level, 1. strong(Default, read from the leader replica) 2. weak(Read from a random replica)
Type	string
Default	strong
Effective	After restarting system

meta_data_cache_enable

Name	meta_data_cache_enable
Description	Whether to cache meta data(BloomFilter, ChunkMetadata and TimeSeriesMetadata) or not.
Type	Boolean
Default	true
Effective	After restarting system

chunk_timeseriesmeta_free_memory_proportion

Name	chunk_timeseriesmeta_free_memory_proportion
Description	Read memory Allocation Ratio: BloomFilterCache : ChunkCache : TimeSeriesMetadataCache : Coordinator : Operators : DataExchange : timeIndex in TsFileResourceList : others.
Default	1 : 100 : 200 : 300 : 400
Effective	After restarting system

enable_last_cache

Name	enable_last_cache
Description	Whether to enable LAST cache.
Type	Boolean
Default	true
Effective	After restarting system

max_deduplicated_path_num

Name	max_deduplicated_path_num
Description	allowed max numbers of deduplicated path in one query.
Type	Int32
Default	1000
Effective	After restarting system

mpp_data_exchange_core_pool_size

Name	mpp_data_exchange_core_pool_size
Description	Core size of ThreadPool of MPP data exchange
Type	int32
Default	10
Effective	After restarting system

mpp_data_exchange_max_pool_size

Name	mpp_data_exchange_max_pool_size
Description	Max size of ThreadPool of MPP data exchange
Type	int32
Default	10
Effective	After restarting system

mpp_data_exchange_keep_alive_time_in_ms

Name	mpp_data_exchange_keep_alive_time_in_ms
Description	Max waiting time for MPP data exchange
Type	long
Default	1000
Effective	After restarting system

driver_task_execution_time_slice_in_ms

Name	driver_task_execution_time_slice_in_ms
Description	Maximum execution time of a DriverTask
Type	int32
Default	100
Effective	After restarting system

max_tsblock_size_in_bytes

Name	max_tsblock_size_in_bytes
Description	Maximum capacity of a TsBlock
Type	int32
Default	1024 * 1024 (1 MB)
Effective	After restarting system

max_tsblock_line_numbers

Name	max_tsblock_line_numbers
Description	Maximum number of lines in a single TsBlock
Type	int32
Default	1000
Effective	After restarting system

slow_query_threshold

Name	slow_query_threshold
Description	Time cost(ms) threshold for slow query.
Type	Int32
Default	5000
Effective	Trigger

query_timeout_threshold

Name	query_timeout_threshold
Description	The max executing time of query. unit: ms
Type	Int32
Default	60000
Effective	After restarting system

max_allowed_concurrent_queries

Name	max_allowed_concurrent_queries
Description	The maximum allowed concurrently executing queries.
Type	Int32
Default	1000
Effective	After restarting system

query_thread_count

Name	query_thread_count
Description	How many threads can concurrently execute query statement. When <= 0, use CPU core number.
Type	Int32
Default	CPU core number
Effective	After restarting system

batch_size

Name	batch_size
Description	The amount of data iterate each time in server (the number of data strips, that is, the number of different timestamps.)
Type	Int32
Default	100000
Effective	After restarting system

Storage Engine Configuration

default_ttl_in_ms

Name	default_ttl_in_ms
Description	Default ttl when each database created
Type	Long
Default	Infinity
Effective	After restarting system

max_waiting_time_when_insert_blocked

Name	max_waiting_time_when_insert_blocked
Description	When the waiting time(in ms) of an inserting exceeds this, throw an exception
Type	Int32
Default	10000
Effective	After restarting system

enable_discard_out_of_order_data

Name	enable_discard_out_of_order_data
Description	whether to discard out of order data
Type	Boolean
Default	false
Effective	After restarting system

handle_system_error

Name	handle_system_error
Description	What will the system do when unrecoverable error occurs
Type	String
Default	CHANGE_TO_READ_ONLY
Effective	After restarting system

memtable_size_threshold

Name	memtable_size_threshold
Description	max memtable size
Type	Long
Default	1073741824
Effective	when enable_mem_control is false & After restarting system

write_memory_variation_report_proportion

Name	write_memory_variation_report_proportion
Description	if memory cost of data region increased more than proportion of allocated memory for write, report to system
Type	Double
Default	0.001
Effective	After restarting system

enable_timed_flush_seq_memtable

Name	enable_timed_flush_seq_memtable
Description	whether to enable timed flush sequence memtable
Type	Boolean
Default	true
Effective	hot-load

seq_memtable_flush_interval_in_ms

Name	seq_memtable_flush_interval_in_ms
Description	if a memTable’s created time is older than current time minus this, the memtable will be flushed to disk
Type	int32
Default	10800000
Effective	hot-load

seq_memtable_flush_check_interval_in_ms

Name	seq_memtable_flush_check_interval_in_ms
Description	the interval to check whether sequence memtables need flushing
Type	int32
Default	600000
Effective	hot-load

enable_timed_flush_unseq_memtable

Name	enable_timed_flush_unseq_memtable
Description	whether to enable timed flush unsequence memtable
Type	Boolean
Default	false
Effective	hot-load

unseq_memtable_flush_interval_in_ms

Name	unseq_memtable_flush_interval_in_ms
Description	if a memTable’s created time is older than current time minus this, the memtable will be flushed to disk
Type	int32
Default	10800000
Effective	hot-load

unseq_memtable_flush_check_interval_in_ms

Name	unseq_memtable_flush_check_interval_in_ms
Description	the interval to check whether unsequence memtables need flushing
Type	int32
Default	600000
Effective	hot-load

tvlist_sort_algorithm

Name	tvlist_sort_algorithm
Description	the sort algorithm used in the memtable’s TVList
Type	String
Default	TIM
Effective	After restarting system

avg_series_point_number_threshold

Name	avg_series_point_number_threshold
Description	max average number of point of each series in memtable
Type	int32
Default	100000
Effective	After restarting system

flush_thread_count

Name	flush_thread_count
Description	The thread number used to perform the operation when IoTDB writes data in memory to disk. If the value is less than or equal to 0, then the number of CPU cores installed on the machine is used. The default is 0.
Type	int32
Default	0
Effective	After restarting system

enable_partial_insert

Name	enable_partial_insert
Description	Whether continue to write other measurements if some measurements are failed in one insertion.
Type	Boolean
Default	true
Effective	After restarting system

recovery_log_interval_in_ms

Name	recovery_log_interval_in_ms
Description	the interval to log recover progress of each region when starting iotdb
Type	Int32
Default	5000
Effective	After restarting system

upgrade_thread_count

Name	upgrade_thread_count
Description	When there exists old version(v2) TsFile, how many thread will be set up to perform upgrade tasks
Type	Int32
Default	1
Effective	After restarting system

insert_multi_tablet_enable_multithreading_column_threshold

Name	insert_multi_tablet_enable_multithreading_column_threshold
Description	When the insert plan column count reaches the specified threshold, multi-threading is enabled.
Type	int32
Default	10
Effective	After restarting system

Compaction Configurations

enable_seq_space_compaction

Name	enable_seq_space_compaction
Description	enable the compaction between sequence files
Type	Boolean
Default	true
Effective	After restart system

enable_unseq_space_compaction

Name	enable_unseq_space_compaction
Description	enable the compaction between unsequence files
Type	Boolean
Default	false
Effective	After restart system

enable_cross_space_compaction

Name	enable_cross_space_compaction
Description	enable the compaction between sequence files and unsequence files
Type	Boolean
Default	true
Effective	After restart system

cross_selector

Name	cross_selector
Description	the task selector type of cross space compaction
Type	String
Default	rewrite
Effective	After restart system

cross_performer

Name	cross_performer
Description	the task performer type of cross space compaction. The options are read_point and fast, read_point is the default and fast is still under test
Type	String
Default	read_point
Effective	After restart system

inner_seq_selector

Name	inner_seq_selector
Description	the task selector type of inner sequence space compaction
Type	String
Default	size_tiered
Effective	After restart system

inner_seq_performer

Name	inner_seq_peformer
Description	the task performer type of inner sequence space compaction. The options are read_chunk and fast, read_chunk is the default and fast is still under test
Type	String
Default	read_chunk
Effective	After restart system

inner_unseq_selector

Name	inner_unseq_selector
Description	the task selector type of inner unsequence space compaction
Type	String
Default	size_tiered
Effective	After restart system

inner_unseq_performer

Name	inner_unseq_peformer
Description	the task performer type of inner unsequence space compaction. The options are read_point and fast, read_point is the default and fast is still under test
Type	String
Default	read_point
Effective	After restart system

compaction_priority

Name	compaction_priority
Description	Priority of compaction task. When it is BALANCE, system executes all types of compaction equally; when it is INNER_CROSS, system takes precedence over executing inner space compaction task; when it is CROSS_INNER, system takes precedence over executing cross space compaction task
Type	String
Default	BALANCE
Effective	After restart system

target_compaction_file_size

Name	target_compaction_file_size
Description	The target file is in inner space compaction
Type	Int64
Default	1073741824
Effective	After restart system

target_chunk_size

Name	target_chunk_size
Description	The target size of compacted chunk
Type	Int64
Default	1048576
Effective	After restart system

target_chunk_point_num

Name	target_chunk_point_num
Description	The target point number of compacted chunk
Type	int32
Default	100000
Effective	After restart system

chunk_size_lower_bound_in_compaction

Name	chunk_size_lower_bound_in_compaction
Description	A source chunk will be deserialized in compaction when its size is less than this value
Type	Int64
Default	10240
Effective	After restart system

chunk_point_num_lower_bound_in_compaction

Name	chunk_point_num_lower_bound_in_compaction
Description	A source chunk will be deserialized in compaction when its point num is less than this value
Type	int32
Default	1000
Effective	After restart system

max_inner_compaction_candidate_file_num

Name	max_inner_compaction_candidate_file_num
Description	The max num of files encounter in inner space compaction
Type	int32
Default	30
Effective	After restart system

max_cross_compaction_file_num

Name	max_cross_compaction_candidate_file_num
Description	The max num of files encounter in cross space compaction
Type	int32
Default	1000
Effective	After restart system

max_cross_compaction_file_size

Name	max_cross_compaction_candidate_file_size
Description	The max size of files encounter in cross space compaction
Type	Int64
Default	5368709120
Effective	After restart system

cross_compaction_file_selection_time_budget

Name	cross_compaction_file_selection_time_budget
Description	Time budget for cross space compaction file selection
Type	int32
Default	30000
Effective	After restart system

compaction_thread_count

Name	compaction_thread_count
Description	thread num to execute compaction
Type	int32
Default	10
Effective	After restart system

compaction_schedule_interval_in_ms

Name	compaction_schedule_interval_in_ms
Description	interval of scheduling compaction
Type	Int64
Default	60000
Effective	After restart system

compaction_submission_interval_in_ms

Name	compaction_submission_interval_in_ms
Description	interval of submitting compaction task
Type	Int64
Default	60000
Effective	After restart system

compaction_write_throughput_mb_per_sec

Name	compaction_write_throughput_mb_per_sec
Description	The write rate of all compaction tasks in MB/s
Type	int32
Default	16
Effective	After restart system

sub_compaction_thread_count

Name	sub_compaction_thread_count
Description	the number of sub-compaction threads to accelerate cross space compaction
Type	Int32
Default	4
Effective	After restart system

enable_compaction_validation

Name	enable_compaction_validation
Description	Enable the check of sequence tsfile time range after compaction
Type	Boolean
Default	true
Effective	After restart system

candidate_compaction_task_queue_size

Name	candidate_compaction_task_queue_size
Description	The size of candidate compaction task queue
Type	Int32
Default	50
Effective	After restart system

Write Ahead Log Configuration

wal_mode

Name	wal_mode
Description	The write mode of wal. For DISABLE mode, the system will disable wal. For SYNC mode, the system will submit wal synchronously, write request will not return until its wal is fsynced to the disk successfully. For ASYNC mode, the system will submit wal asynchronously, write request will return immediately no matter its wal is fsynced to the disk successfully.
Type	String
Default	ASYNC
Effective	After restart system

max_wal_nodes_num

Name	max_wal_nodes_num
Description	Max number of wal nodes, each node corresponds to one wal directory. The default value 0 means the number is determined by the system.
Type	int32
Default	0
Effective	After restart system

fsync_wal_delay_in_ms

Name	fsync_wal_delay_in_ms
Description	Duration a wal flush operation will wait before calling fsync
Type	int32
Default	3
Effective	hot-load

wal_buffer_size_in_byte

Name	wal_buffer_size_in_byte
Description	Buffer size of each wal node
Type	int32
Default	16777216
Effective	After restart system

wal_buffer_queue_capacity

Name	wal_buffer_queue_capacity
Description	Blocking queue capacity of each wal buffer
Type	int32
Default	50
Effective	After restart system

wal_file_size_threshold_in_byte

Name	wal_file_size_threshold_in_byte
Description	Size threshold of each wal file
Type	int32
Default	10485760
Effective	hot-load

wal_min_effective_info_ratio

Name	wal_min_effective_info_ratio
Description	Minimum ratio of effective information in wal files
Type	double
Default	0.1
Effective	hot-load

wal_memtable_snapshot_threshold_in_byte

Name	wal_memtable_snapshot_threshold_in_byte
Description	MemTable size threshold for triggering MemTable snapshot in wal
Type	int64
Default	8388608
Effective	hot-load

max_wal_memtable_snapshot_num

Name	max_wal_memtable_snapshot_num
Description	MemTable’s max snapshot number in wal
Type	int32
Default	1
Effective	hot-load

delete_wal_files_period_in_ms

Name	delete_wal_files_period_in_ms
Description	The period when outdated wal files are periodically deleted
Type	int64
Default	20000
Effective	hot-load

TsFile Configurations

group_size_in_byte

Name	group_size_in_byte
Description	The data size written to the disk per time
Type	int32
Default	134217728
Effective	hot-load

page_size_in_byte

Name	page_size_in_byte
Description	The maximum size of a single page written in memory when each column in memory is written (in bytes)
Type	int32
Default	65536
Effective	hot-load

max_number_of_points_in_page

Name	max_number_of_points_in_page
Description	The maximum number of data points (timestamps - valued groups) contained in a page
Type	int32
Default	10000
Effective	hot-load

pattern_matching_threshold

Name	pattern_matching_threshold
Description	Max matching time of regex pattern
Type	int32
Default	1000000
Effective	hot-load

max_degree_of_index_node

Name	max_degree_of_index_node
Description	The maximum degree of the metadata index tree (that is, the max number of each node’s children)
Type	int32
Default	256
Effective	Only allowed to be modified in first start up

max_string_length

Name	max_string_length
Description	The maximum length of a single string (number of character)
Type	int32
Default	128
Effective	hot-load

time_encoder

Name	time_encoder
Description	Encoding type of time column
Type	Enum String: “TS_2DIFF”,“PLAIN”,“RLE”
Default	TS_2DIFF
Effective	hot-load

value_encoder

Name	value_encoder
Description	Encoding type of value column
Type	Enum String: “TS_2DIFF”,“PLAIN”,“RLE”
Default	PLAIN
Effective	hot-load

float_precision

Name	float_precision
Description	The precision of the floating point number.(The number of digits after the decimal point)
Type	int32
Default	The default is 2 digits. Note: The 32-bit floating point number has a decimal precision of 7 bits, and the 64-bit floating point number has a decimal precision of 15 bits. If the setting is out of the range, it will have no practical significance.
Effective	hot-load

compressor

Name	compressor
Description	Data compression method
Type	Enum String : “UNCOMPRESSED”, “SNAPPY”, “LZ4”
Default	SNAPPY
Effective	hot-load

bloomFilterErrorRate

Name	bloomFilterErrorRate
Description	The false positive rate of bloom filter in each TsFile. Bloom filter checks whether a given time series is in the tsfile before loading metadata. This can improve the performance of loading metadata and skip the tsfile that doesn’t contain specified time series. If you want to learn more about its mechanism, you can refer to: wiki page of bloom filteropen in new window.
Type	float, (0, 1)
Default	0.05
Effective	After restarting system

freq_snr

Name	freq_snr
Description	Signal-noise-ratio (SNR) of lossy FREQ encoding
Type	Double
Default	40.0
Effective	hot-load

freq_block_size

Name	freq_block_size
Description	Block size of FREQ encoding. In other words, the number of data points in a time-frequency transformation. To speed up the encoding, it is recommended to be the power of 2.
Type	int32
Default	1024
Effective	hot-load

Authorization Configuration

authorizer_provider_class

Name	authorizer_provider_class
Description	the class name of the authorization service
Type	String
Default	org.apache.iotdb.commons.auth.authorizer.LocalFileAuthorizer
Effective	After restarting system
Other available values	org.apache.iotdb.commons.auth.authorizer.OpenIdAuthorizer

openID_url

Name	openID_url
Description	the openID server if OpenIdAuthorizer is enabled
Type	String (a http url)
Default	no
Effective	After restarting system

admin_name

Name	admin_name
Description	The username of admin
Type	String
Default	root
Effective	Only allowed to be modified in first start up

admin_password

Name	admin_password
Description	The password of admin
Type	String
Default	root
Effective	Only allowed to be modified in first start up

iotdb_server_encrypt_decrypt_provider

Name	iotdb_server_encrypt_decrypt_provider
Description	The Class for user password encryption
Type	String
Default	org.apache.iotdb.commons.security.encrypt.MessageDigestEncrypt
Effective	Only allowed to be modified in first start up

iotdb_server_encrypt_decrypt_provider_parameter

Name	iotdb_server_encrypt_decrypt_provider_parameter
Description	Parameters used to initialize the user password encryption class
Type	String
Default	空
Effective	After restarting system

author_cache_size

Name	author_cache_size
Description	Cache size of user and role
Type	int32
Default	1000
Effective	After restarting system

author_cache_expire_time

Name	author_cache_expire_time
Description	Cache expire time of user and role, Unit: minutes
Type	int32
Default	30
Effective	After restarting system

UDF Configuration

udf_initial_byte_array_length_for_memory_control

Name	udf_initial_byte_array_length_for_memory_control
Description	Used to estimate the memory usage of text fields in a UDF query. It is recommended to set this value to be slightly larger than the average length of all texts.
Type	int32
Default	48
Effective	After restarting system

udf_memory_budget_in_mb

Name	udf_memory_budget_in_mb
Description	How much memory may be used in ONE UDF query (in MB). The upper limit is 20% of allocated memory for read.
Type	Float
Default	30.0
Effective	After restarting system

udf_reader_transformer_collector_memory_proportion

Name	udf_reader_transformer_collector_memory_proportion
Description	UDF memory allocation ratio for reader, transformer and collector. The parameter form is a : b : c, where a, b, and c are integers.
Type	String
Default	1:1:1
Effective	After restarting system

udf_root_dir

Name	udf_root_dir
Description	Root directory of UDF
Type	String
Default	ext/udf(Windows:ext\udf)
Effective	After restarting system

udf_lib_dir

Name	udf_lib_dir
Description	UDF log and jar file dir
Type	String
Default	ext/udf（Windows：ext\udf）
Effective	After restarting system

Trigger Configuration

trigger_lib_dir

Name	trigger_lib_dir
Description	Trigger JAR file dir
Type	String
Default	ext/trigger
Effective	After restarting system

stateful_trigger_retry_num_when_not_found

Name	stateful_trigger_retry_num_when_not_found
Description	How many times we will retry to found an instance of stateful trigger on DataNodes
Type	Int32
Default	3
Effective	After restarting system

SELECT-INTO

select_into_insert_tablet_plan_row_limit

Name	select_into_insert_tablet_plan_row_limit
Description	The maximum number of rows that can be processed in insert-tablet-plan when executing select-into statements. When <= 0, use 10000.
Type	int32
Default	10000
Effective	hot-load

into_operation_execution_thread_count

Name	into_operation_execution_thread_count
Description	The number of threads in the thread pool that execute insert-tablet tasks
Type	int32
Default	2
Effective	After restarting system

Continuous Query

continuous_query_execution_thread

Name	continuous_query_execution_thread
Description	How many threads will be set up to perform continuous queries
Type	int32
Default	max(1, the / 2)
Effective	After restarting system

continuous_query_min_every_interval

Name	continuous_query_min_every_interval
Description	Minimum every interval to perform continuous query.
Type	duration
Default	1s
Effective	After restarting system

PIPE Configuration

ip_white_list

Name	ip_white_list
Description	Set the white list of IP addresses of the sender of the synchronization, which is expressed in the form of network segments, and multiple network segments are separated by commas. When the sender synchronizes data to the receiver, the receiver allows synchronization only when the IP address of the sender is within the network segment set in the white list. If the whitelist is empty, the receiver does not allow any sender to synchronize data. By default, the receiver rejects the synchronization request of all IP addresses except 127.0.0.1. When configuring this parameter, please ensure that all DataNode addresses on the sender are set.
Type	String
Default	127.0.0.1/32
Effective	hot-load

max_number_of_sync_file_retry

Name	max_number_of_sync_file_retry
Description	The maximum number of retries when the sender fails to synchronize files to the receiver.
Type	int32
Default	5
Effective	hot-load

RatisConsensus Configuration

config_node_ratis_log_appender_buffer_size_max

Name	config_node_ratis_log_appender_buffer_size_max
Description	confignode max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

schema_region_ratis_log_appender_buffer_size_max

Name	schema_region_ratis_log_appender_buffer_size_max
Description	schema region max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

data_region_ratis_log_appender_buffer_size_max

Name	data_region_ratis_log_appender_buffer_size_max
Description	data region max payload size for a single log-sync-RPC from leader to follower
Type	int32
Default	4MB
Effective	After restarting system

config_node_ratis_snapshot_trigger_threshold

Name	config_node_ratis_snapshot_trigger_threshold
Description	confignode trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

schema_region_ratis_snapshot_trigger_threshold

Name	schema_region_ratis_snapshot_trigger_threshold
Description	schema region trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

data_region_ratis_snapshot_trigger_threshold

Name	data_region_ratis_snapshot_trigger_threshold
Description	data region trigger a snapshot when snapshot_trigger_threshold logs are written
Type	int32
Default	400,000
Effective	After restarting system

config_node_ratis_log_unsafe_flush_enable

Name	config_node_ratis_log_unsafe_flush_enable
Description	confignode allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

schema_region_ratis_log_unsafe_flush_enable

Name	schema_region_ratis_log_unsafe_flush_enable
Description	schema region allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

data_region_ratis_log_unsafe_flush_enable

Name	data_region_ratis_log_unsafe_flush_enable
Description	data region allows flushing Raft Log asynchronously
Type	boolean
Default	false
Effective	After restarting system

config_node_ratis_log_segment_size_max_in_byte

Name	config_node_ratis_log_segment_size_max_in_byte
Description	confignode max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

schema_region_ratis_log_segment_size_max_in_byte

Name	schema_region_ratis_log_segment_size_max_in_byte
Description	schema region max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

data_region_ratis_log_segment_size_max_in_byte

Name	data_region_ratis_log_segment_size_max_in_byte
Description	data region max capacity of a single Log segment file
Type	int32
Default	24MB
Effective	After restarting system

config_node_ratis_grpc_flow_control_window

Name	config_node_ratis_grpc_flow_control_window
Description	confignode flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

schema_region_ratis_grpc_flow_control_window

Name	schema_region_ratis_grpc_flow_control_window
Description	schema region flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

data_region_ratis_grpc_flow_control_window

Name	data_region_ratis_grpc_flow_control_window
Description	data region flow control window for ratis grpc log appender
Type	int32
Default	4MB
Effective	After restarting system

config_node_ratis_rpc_leader_election_timeout_min_ms

Name	config_node_ratis_rpc_leader_election_timeout_min_ms
Description	confignode min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

schema_region_ratis_rpc_leader_election_timeout_min_ms

Name	schema_region_ratis_rpc_leader_election_timeout_min_ms
Description	schema region min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

data_region_ratis_rpc_leader_election_timeout_min_ms

Name	data_region_ratis_rpc_leader_election_timeout_min_ms
Description	data region min election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

config_node_ratis_rpc_leader_election_timeout_max_ms

Name	config_node_ratis_rpc_leader_election_timeout_max_ms
Description	confignode max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

schema_region_ratis_rpc_leader_election_timeout_max_ms

Name	schema_region_ratis_rpc_leader_election_timeout_max_ms
Description	schema region max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

data_region_ratis_rpc_leader_election_timeout_max_ms

Name	data_region_ratis_rpc_leader_election_timeout_max_ms
Description	data region max election timeout for leader election
Type	int32
Default	2000ms
Effective	After restarting system

config_node_ratis_request_timeout_ms

Name	config_node_ratis_request_timeout_ms
Description	confignode ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

schema_region_ratis_request_timeout_ms

Name	schema_region_ratis_request_timeout_ms
Description	schema region ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

data_region_ratis_request_timeout_ms

Name	data_region_ratis_request_timeout_ms
Description	data region ratis client retry threshold
Type	int32
Default	10s
Effective	After restarting system

config_node_ratis_max_retry_attempts

Name	config_node_ratis_max_retry_attempts
Description	confignode ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

config_node_ratis_initial_sleep_time_ms

Name	config_node_ratis_initial_sleep_time_ms
Description	confignode ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

config_node_ratis_max_sleep_time_ms

Name	config_node_ratis_max_sleep_time_ms
Description	confignode ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

schema_region_ratis_max_retry_attempts

Name	schema_region_ratis_max_retry_attempts
Description	schema region ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

schema_region_ratis_initial_sleep_time_ms

Name	schema_region_ratis_initial_sleep_time_ms
Description	schema region ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

schema_region_ratis_max_sleep_time_ms

Name	schema_region_ratis_max_sleep_time_ms
Description	schema region ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

data_region_ratis_max_retry_attempts

Name	data_region_ratis_max_retry_attempts
Description	data region ratis client max retry attempts
Type	int32
Default	10
Effective	After restarting system

data_region_ratis_initial_sleep_time_ms

Name	data_region_ratis_initial_sleep_time_ms
Description	data region ratis client retry initial sleep time
Type	int32
Default	100ms
Effective	After restarting system

data_region_ratis_max_sleep_time_ms

Name	data_region_ratis_max_sleep_time_ms
Description	data region ratis client retry max sleep time
Type	int32
Default	10s
Effective	After restarting system

config_node_ratis_preserve_logs_num_when_purge

Name	config_node_ratis_preserve_logs_num_when_purge
Description	confignode preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

schema_region_ratis_preserve_logs_num_when_purge

Name	schema_region_ratis_preserve_logs_num_when_purge
Description	schema region preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

data_region_ratis_preserve_logs_num_when_purge

Name	data_region_ratis_preserve_logs_num_when_purge
Description	data region preserves certain logs when take snapshot and purge
Type	int32
Default	1000
Effective	After restarting system

Procedure Configuration

procedure_core_worker_thread_count

Name	procedure_core_worker_thread_count
Description	The number of worker thread count
Type	int32
Default	4
Effective	After restarting system

procedure_completed_clean_interval

Name	procedure_completed_clean_interval
Description	Time interval of completed procedure cleaner work in
Type	int32
Unit	second
Default	30
Effective	After restarting system

procedure_completed_evict_ttl

Name	procedure_completed_evict_ttl
Description	The ttl of completed procedure
Type	int32
Unit	second
Default	800
Effective	After restarting system

MQTT Broker Configuration

enable_mqtt_service

Name	enable_mqtt_service。
Description	Whether to enable the MQTT service
Type	Boolean
Default	False
Effective	hot-load

mqtt_host

Name	mqtt_host
Description	The host to which the MQTT service is bound
Type	String
Default	0.0.0.0
Effective	hot-load

mqtt_port

Name	mqtt_port
Description	The port to which the MQTT service is bound
Type	int32
Default	1883
Effective	hot-load

mqtt_handler_pool_size

Name	mqtt_handler_pool_size
Description	The size of the handler pool used to process MQTT messages
Type	int32
Default	1
Effective	hot-load

mqtt_payload_formatter

Name	mqtt_payload_formatter
Description	MQTT message payload formatter
Type	String
Default	JSON
Effective	hot-load

mqtt_max_message_size

Name	mqtt_max_message_size
Description	Maximum length of MQTT message in bytes
Type	int32
Default	1048576
Effective	hot-load

REST Service Configuration

enable_rest_service

Name	enable_rest_service
Description	Whether to enable the Rest service
Type	Boolean
Default	false
Effective	After restarting system

rest_service_port

Name	rest_service_port
Description	The Rest service listens to the port number
Type	int32
Default	18080
Effective	After restarting system

enable_swagger

Name	enable_swagger
Description	Whether to enable swagger to display rest interface information
Type	Boolean
Default	false
Effective	After restarting system

rest_query_default_row_size_limit

Name	rest_query_default_row_size_limit
Description	The maximum number of rows in a result set that can be returned by a query
Type	int32
Default	10000
Effective	After restarting system

cache_expire

Name	cache_expire
Description	Expiration time for caching customer login information
Type	int32
Default	28800
Effective	After restarting system

cache_max_num

Name	cache_max_num
Description	The maximum number of users stored in the cache
Type	int32
Default	100
Effective	After restarting system

cache_init_num

Name	cache_init_num
Description	Initial cache capacity
Type	int32
Default	10
Effective	After restarting system

enable_https

Name	cache_init_num
Description	REST Service Specifies whether to enable SSL configuration
Type	Boolean
Default	false
Effective	After restarting system

key_store_path

Name	key_store_path
Description	keyStore path (optional)
Type	String
Default	“”
Effective	After restarting system

key_store_pwd

Name	key_store_pwd
Description	keyStore Password (optional)
Type	String
Default	“”
Effective	After restarting system

trust_store_path

Name	trust_store_path
Description	keyStore Password (optional)
Type	String
Default	“”
Effective	After restarting system

trust_store_pwd

Name	trust_store_pwd
Description	trustStore Password (Optional)
Type	String
Default	“”
Effective	After restarting system

idle_timeout

Name	idle_timeout
Description	SSL timeout duration, expressed in seconds
Type	int32
Default	5000
Effective	After restarting system

InfluxDB RPC Service Configuration

enable_influxdb_rpc_service

Name	enable_influxdb_rpc_service
Description	Whether to enable InfluxDB RPC service
Type	Boolean
Default	true
Effective	After restarting system

influxdb_rpc_port

Name	influxdb_rpc_port
Description	The port used by InfluxDB RPC service
Type	int32
Default	8086
Effective	After restarting system

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