HugeGraph 配置
1 概述
配置文件的目录为 hugegraph-release/conf,所有关于服务和图本身的配置都在此目录下。
主要的配置文件包括:gremlin-server.yaml、rest-server.properties 和 hugegraph.properties
HugeGraphServer 内部集成了 GremlinServer 和 RestServer,而 gremlin-server.yaml 和 rest-server.properties 就是用来配置这两个 Server 的。
- GremlinServer:GremlinServer 接受用户的 gremlin 语句,解析后转而调用 Core 的代码。
- RestServer:提供 RESTful API,根据不同的 HTTP 请求,调用对应的 Core API,如果用户请求体是 gremlin 语句,则会转发给 GremlinServer,实现对图数据的操作。
下面对这三个配置文件逐一介绍。
2 gremlin-server.yaml
gremlin-server.yaml 文件默认的内容如下:
# host and port of gremlin server, need to be consistent with host and port in rest-server.properties
#host: 127.0.0.1
#port: 8182
# Gremlin 查询中的超时时间(以毫秒为单位)
evaluationTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WsAndHttpChannelizer
# 不要在此处设置图形,此功能将在支持动态添加图形后再进行处理
graphs: {
}
scriptEngines: {
gremlin-groovy: {
staticImports: [
org.opencypher.gremlin.process.traversal.CustomPredicates.*',
org.opencypher.gremlin.traversal.CustomFunctions.*
],
plugins: {
org.apache.hugegraph.plugin.HugeGraphGremlinPlugin: {},
org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {
classImports: [
java.lang.Math,
org.apache.hugegraph.backend.id.IdGenerator,
org.apache.hugegraph.type.define.Directions,
org.apache.hugegraph.type.define.NodeRole,
org.apache.hugegraph.traversal.algorithm.CollectionPathsTraverser,
org.apache.hugegraph.traversal.algorithm.CountTraverser,
org.apache.hugegraph.traversal.algorithm.CustomizedCrosspointsTraverser,
org.apache.hugegraph.traversal.algorithm.CustomizePathsTraverser,
org.apache.hugegraph.traversal.algorithm.FusiformSimilarityTraverser,
org.apache.hugegraph.traversal.algorithm.HugeTraverser,
org.apache.hugegraph.traversal.algorithm.JaccardSimilarTraverser,
org.apache.hugegraph.traversal.algorithm.KneighborTraverser,
org.apache.hugegraph.traversal.algorithm.KoutTraverser,
org.apache.hugegraph.traversal.algorithm.MultiNodeShortestPathTraverser,
org.apache.hugegraph.traversal.algorithm.NeighborRankTraverser,
org.apache.hugegraph.traversal.algorithm.PathsTraverser,
org.apache.hugegraph.traversal.algorithm.PersonalRankTraverser,
org.apache.hugegraph.traversal.algorithm.SameNeighborTraverser,
org.apache.hugegraph.traversal.algorithm.ShortestPathTraverser,
org.apache.hugegraph.traversal.algorithm.SingleSourceShortestPathTraverser,
org.apache.hugegraph.traversal.algorithm.SubGraphTraverser,
org.apache.hugegraph.traversal.algorithm.TemplatePathsTraverser,
org.apache.hugegraph.traversal.algorithm.steps.EdgeStep,
org.apache.hugegraph.traversal.algorithm.steps.RepeatEdgeStep,
org.apache.hugegraph.traversal.algorithm.steps.WeightedEdgeStep,
org.apache.hugegraph.traversal.optimize.ConditionP,
org.apache.hugegraph.traversal.optimize.Text,
org.apache.hugegraph.traversal.optimize.TraversalUtil,
org.apache.hugegraph.util.DateUtil,
org.opencypher.gremlin.traversal.CustomFunctions,
org.opencypher.gremlin.traversal.CustomPredicate
],
methodImports: [
java.lang.Math#*,
org.opencypher.gremlin.traversal.CustomPredicate#*,
org.opencypher.gremlin.traversal.CustomFunctions#*
]
},
org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {
files: [scripts/empty-sample.groovy]
}
}
}
}
serializers:
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1,
config: {
serializeResultToString: false,
ioRegistries: [org.apache.hugegraph.io.HugeGraphIoRegistry]
}
}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0,
config: {
serializeResultToString: false,
ioRegistries: [org.apache.hugegraph.io.HugeGraphIoRegistry]
}
}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV2d0,
config: {
serializeResultToString: false,
ioRegistries: [org.apache.hugegraph.io.HugeGraphIoRegistry]
}
}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0,
config: {
serializeResultToString: false,
ioRegistries: [org.apache.hugegraph.io.HugeGraphIoRegistry]
}
}
metrics: {
consoleReporter: {enabled: false, interval: 180000},
csvReporter: {enabled: false, interval: 180000, fileName: ./metrics/gremlin-server-metrics.csv},
jmxReporter: {enabled: false},
slf4jReporter: {enabled: false, interval: 180000},
gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},
graphiteReporter: {enabled: false, interval: 180000}
}
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferLowWaterMark: 32768
writeBufferHighWaterMark: 65536
ssl: {
enabled: false
}
上面的配置项很多,但目前只需要关注如下几个配置项:channelizer 和 graphs。
- graphs:GremlinServer 启动时需要打开的图,该项是一个 map 结构,key 是图的名字,value 是该图的配置文件路径;
- channelizer:GremlinServer 与客户端有两种通信方式,分别是 WebSocket 和 HTTP(默认)。如果选择 WebSocket, 用户可以通过 Gremlin-Console 快速体验 HugeGraph 的特性,但是不支持大规模数据导入, 推荐使用 HTTP 的通信方式,HugeGraph 的外围组件都是基于 HTTP 实现的;
默认 GremlinServer 是服务在 localhost:8182,如果需要修改,配置 host、port 即可
- host:部署 GremlinServer 机器的机器名或 IP,目前 HugeGraphServer 不支持分布式部署,且 GremlinServer 不直接暴露给用户;
- port:部署 GremlinServer 机器的端口;
同时需要在 rest-server.properties 中增加对应的配置项 gremlinserver.url=http://host:port
3 rest-server.properties
rest-server.properties 文件的默认内容如下:
# bind url
restserver.url=http://127.0.0.1:8080
# gremlin server url, need to be consistent with host and port in gremlin-server.yaml
#gremlinserver.url=http://127.0.0.1:8182
# graphs list with pair NAME:CONF_PATH
graphs=[hugegraph:conf/hugegraph.properties]
# authentication
#auth.authenticator=
#auth.admin_token=
#auth.user_tokens=[]
server.id=server-1
server.role=master
- restserver.url:RestServer 提供服务的 url,根据实际环境修改;
- graphs:RestServer 启动时也需要打开图,该项为 map 结构,key 是图的名字,value 是该图的配置文件路径;
注意:gremlin-server.yaml 和 rest-server.properties 都包含 graphs 配置项,而
init-store
命令是根据 gremlin-server.yaml 的 graphs 下的图进行初始化的。配置项 gremlinserver.url 是 GremlinServer 为 RestServer 提供服务的 url,该配置项默认为 http://localhost:8182,如需修改,需要和 gremlin-server.yaml 中的 host 和 port 相匹配;
4 hugegraph.properties
hugegraph.properties 是一类文件,因为如果系统存在多个图,则会有多个相似的文件。该文件用来配置与图存储和查询相关的参数,文件的默认内容如下:
# gremlin entrence to create graph
gremlin.graph=org.apache.hugegraph.HugeFactory
# cache config
#schema.cache_capacity=100000
# vertex-cache default is 1000w, 10min expired
#vertex.cache_capacity=10000000
#vertex.cache_expire=600
# edge-cache default is 100w, 10min expired
#edge.cache_capacity=1000000
#edge.cache_expire=600
# schema illegal name template
#schema.illegal_name_regex=\s+|~.*
#vertex.default_label=vertex
backend=rocksdb
serializer=binary
store=hugegraph
raft.mode=false
raft.safe_read=false
raft.use_snapshot=false
raft.endpoint=127.0.0.1:8281
raft.group_peers=127.0.0.1:8281,127.0.0.1:8282,127.0.0.1:8283
raft.path=./raft-log
raft.use_replicator_pipeline=true
raft.election_timeout=10000
raft.snapshot_interval=3600
raft.backend_threads=48
raft.read_index_threads=8
raft.queue_size=16384
raft.queue_publish_timeout=60
raft.apply_batch=1
raft.rpc_threads=80
raft.rpc_connect_timeout=5000
raft.rpc_timeout=60000
# if use 'ikanalyzer', need download jar from 'https://github.com/apache/hugegraph-doc/raw/ik_binary/dist/server/ikanalyzer-2012_u6.jar' to lib directory
search.text_analyzer=jieba
search.text_analyzer_mode=INDEX
# rocksdb backend config
#rocksdb.data_path=/path/to/disk
#rocksdb.wal_path=/path/to/disk
# cassandra backend config
cassandra.host=localhost
cassandra.port=9042
cassandra.username=
cassandra.password=
#cassandra.connect_timeout=5
#cassandra.read_timeout=20
#cassandra.keyspace.strategy=SimpleStrategy
#cassandra.keyspace.replication=3
# hbase backend config
#hbase.hosts=localhost
#hbase.port=2181
#hbase.znode_parent=/hbase
#hbase.threads_max=64
# mysql backend config
#jdbc.driver=com.mysql.jdbc.Driver
#jdbc.url=jdbc:mysql://127.0.0.1:3306
#jdbc.username=root
#jdbc.password=
#jdbc.reconnect_max_times=3
#jdbc.reconnect_interval=3
#jdbc.ssl_mode=false
# postgresql & cockroachdb backend config
#jdbc.driver=org.postgresql.Driver
#jdbc.url=jdbc:postgresql://localhost:5432/
#jdbc.username=postgres
#jdbc.password=
# palo backend config
#palo.host=127.0.0.1
#palo.poll_interval=10
#palo.temp_dir=./palo-data
#palo.file_limit_size=32
重点关注未注释的几项:
- gremlin.graph:GremlinServer 的启动入口,用户不要修改此项;
- backend:使用的后端存储,可选值有 memory、cassandra、scylladb、mysql、hbase、postgresql 和 rocksdb;
- serializer:主要为内部使用,用于将 schema、vertex 和 edge 序列化到后端,对应的可选值为 text、cassandra、scylladb 和 binary;(注:rocksdb 后端值需是 binary,其他后端 backend 与 serializer 值需保持一致,如 hbase 后端该值为 hbase)
- store:图存储到后端使用的数据库名,在 cassandra 和 scylladb 中就是 keyspace 名,此项的值与 GremlinServer 和 RestServer 中的图名并无关系,但是出于直观考虑,建议仍然使用相同的名字;
- cassandra.host:backend 为 cassandra 或 scylladb 时此项才有意义,cassandra/scylladb 集群的 seeds;
- cassandra.port:backend 为 cassandra 或 scylladb 时此项才有意义,cassandra/scylladb 集群的 native port;
- rocksdb.data_path:backend 为 rocksdb 时此项才有意义,rocksdb 的数据目录
- rocksdb.wal_path:backend 为 rocksdb 时此项才有意义,rocksdb 的日志目录
- admin.token: 通过一个 token 来获取服务器的配置信息,例如:http://localhost:8080/graphs/hugegraph/conf?token=162f7848-0b6d-4faf-b557-3a0797869c55
5 多图配置
我们的系统是可以存在多个图的,并且各个图的后端可以不一样,比如图 hugegraph_rocksdb
和 hugegraph_mysql
,其中 hugegraph_rocksdb
以 RocksDB
作为后端,hugegraph_mysql
以 MySQL
作为后端。
配置方法也很简单:
[可选]:修改 rest-server.properties
通过修改 rest-server.properties
中的 graphs
配置项来设置图的配置文件目录。默认配置为 graphs=./conf/graphs
,如果想要修改为其它目录则调整 graphs
配置项,比如调整为 graphs=/etc/hugegraph/graphs
,示例如下:
graphs=./conf/graphs
在 conf/graphs
路径下基于 hugegraph.properties
修改得到 hugegraph_mysql_backend.properties
和 hugegraph_rocksdb_backend.properties
hugegraph_mysql_backend.properties
修改的部分如下:
backend=mysql
serializer=mysql
store=hugegraph_mysql
# mysql backend config
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306
jdbc.username=root
jdbc.password=123456
jdbc.reconnect_max_times=3
jdbc.reconnect_interval=3
jdbc.ssl_mode=false
hugegraph_rocksdb_backend.properties
修改的部分如下:
backend=rocksdb
serializer=binary
store=hugegraph_rocksdb
停止 Server,初始化执行 init-store.sh(为新的图创建数据库),重新启动 Server
$ ./bin/stop-hugegraph.sh
$ ./bin/init-store.sh
Initializing HugeGraph Store...
2023-06-11 14:16:14 [main] [INFO] o.a.h.u.ConfigUtil - Scanning option 'graphs' directory './conf/graphs'
2023-06-11 14:16:14 [main] [INFO] o.a.h.c.InitStore - Init graph with config file: ./conf/graphs/hugegraph_rocksdb_backend.properties
...
2023-06-11 14:16:15 [main] [INFO] o.a.h.StandardHugeGraph - Graph 'hugegraph_rocksdb' has been initialized
2023-06-11 14:16:15 [main] [INFO] o.a.h.c.InitStore - Init graph with config file: ./conf/graphs/hugegraph_mysql_backend.properties
...
2023-06-11 14:16:16 [main] [INFO] o.a.h.StandardHugeGraph - Graph 'hugegraph_mysql' has been initialized
2023-06-11 14:16:16 [main] [INFO] o.a.h.StandardHugeGraph - Close graph standardhugegraph[hugegraph_rocksdb]
...
2023-06-11 14:16:16 [main] [INFO] o.a.h.HugeFactory - HugeFactory shutdown
2023-06-11 14:16:16 [hugegraph-shutdown] [INFO] o.a.h.HugeFactory - HugeGraph is shutting down
Initialization finished.
$ ./bin/start-hugegraph.sh
Starting HugeGraphServer...
Connecting to HugeGraphServer (http://127.0.0.1:8080/graphs)...OK
Started [pid 21614]
查看创建的图:
curl http://127.0.0.1:8080/graphs/
{"graphs":["hugegraph_rocksdb","hugegraph_mysql"]}
查看某个图的信息:
curl http://127.0.0.1:8080/graphs/hugegraph_mysql_backend
{"name":"hugegraph_mysql","backend":"mysql"}
curl http://127.0.0.1:8080/graphs/hugegraph_rocksdb_backend
{"name":"hugegraph_rocksdb","backend":"rocksdb"}
Last modified November 1, 2023: doc: optimize description about preload, init-store and others (#293) (62101543)