Apache Livy简介
![[Spark]使用Spark的REST服务Livy](https://livy.incubator.apache.org/assets/themes/apache/img/logo.png "[Spark]使用Spark的REST服务Livy"){kind=logo} |
Apache Livy是由Cloudera Labs贡献的基于Apache Spark的开源REST服务，它不仅以REST的方式代替了Spark传统的处理交互方式，同时也提供企业应用中不可忽视的多用户，安全，以及容错的支持。其功能如下： |
- 拥有可用于多Spark作业或多客户端长时间运行的SparkContext；
- 同时管理多个SparkContext，并在集群（YARN / Mesos）而不是Livy服务器上运行它们，以实现良好的容错性和并发性；
- 可以通过预先编译好的JAR、代码片段或是java/scala客户端API将Spark作业提交到远端的Spark集群上执行。
建立测试环境
使用Livy的REST API
创建交互式会话
curl -X POST -d '{"kind": "spark"}' -H "Content-Type: application/json" http://10.211.55.101:8998/sessions { "id":0, "appId":null, "owner":null, "proxyUser":null, "state":"starting", "kind":"spark", "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ "stdout: ", " stderr: " ] }
成功创建会话0，kind指定为spark，如果之后提交的代码中没有指定kind，则使用此处的会话默认kind。
查询交互式会话列表
curl http://10.211.55.101:8998/sessions { "from":0, "total":1, "sessions":[ { "id":0, "appId":null, "owner":null, "proxyUser":null, "state":"idle", "kind":"spark", "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ "2018-07-18 03:19:16 INFO BlockManager:54 - Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy", "2018-07-18 03:19:16 INFO BlockManagerMaster:54 - Registering BlockManager BlockManagerId(driver, node1, 37891, None)", "2018-07-18 03:19:16 INFO BlockManagerMasterEndpoint:54 - Registering block manager node1:37891 with 366.3 MB RAM, BlockManagerId(driver, node1, 37891, None)", "2018-07-18 03:19:16 INFO BlockManagerMaster:54 - Registered BlockManager BlockManagerId(driver, node1, 37891, None)", "2018-07-18 03:19:16 INFO BlockManager:54 - Initialized BlockManager: BlockManagerId(driver, node1, 37891, None)", "2018-07-18 03:19:16 INFO ContextHandler:781 - Started o.s.j.s.ServletContextHandler@6bc3c1d4{/metrics/json,null,AVAILABLE,@Spark}", "2018-07-18 03:19:17 INFO EventLoggingListener:54 - Logging events to hdfs://node1/user/spark/applicationHistory/local-1531883956147", "2018-07-18 03:19:17 INFO SparkEntries:53 - Spark context finished initialization in 1925ms", "2018-07-18 03:19:17 INFO SparkEntries:87 - Created Spark session (with Hive support).", " stderr: " ] } ] }
提交scala代码片段
curl -X POST -H 'Content-Type: application/json' -d '{"code":"123+321"}' http://10.211.55.101:8998/sessions/0/statements { "id":0, "code":"123+321", "state":"waiting", "output":null, "progress":0 }
查询结果
curl http://10.211.55.101:8998/sessions/0/statements/0 { "id":0, "code":"123+321", "state":"available", "output":{ "status":"ok", "execution_count":0, "data":{ "text/plain":"res0: Int = 444" } }, "progress":1 }
提交sql代码片段
curl http://10.211.55.101:8998/sessions/0/statements -X POST -H 'Content-Type: application/json' -d '{"code":"show tables","kind":"sql"}' { "id":1, "code":"show tables", "state":"waiting", "output":null, "progress":0 }
查询结果
curl http://10.211.55.101:8998/sessions/0/statements/1 { "id":1, "code":"show tables", "state":"available", "output":{ "status":"ok", "execution_count":1, "data":{ "application/json":{ "schema":{ "type":"struct", "fields":[ { "name":"database", "type":"string", "nullable":false, "metadata":{ } }, { "name":"tableName", "type":"string", "nullable":false, "metadata":{ } }, { "name":"isTemporary", "type":"boolean", "nullable":false, "metadata":{ } } ] }, "data":[ [ "default", "emp", false ], [ "default", "emp2", false ], [ "default", "emp3", false ], [ "default", "t1", false ], [ "default", "t2", false ], [ "default", "t4", false ], [ "default", "tv", false ], [ "default", "yqu1", false ], [ "default", "yqu2", false ] ] } } }, "progress":1 }
测试下来，发现暂时不支持一次提交多条sql；
提交批处理请求
hadoop fs -put /home/vagrant/HelloSparkHive/build/libs/hello-spark-hive-0.1.0.jar /tmp/ curl -H "Content-Type: application/json" -X POST -d '{ "conf": {"spark.master":"local [2]"}, "file":"/tmp/hello-spark-hive-0.1.0.jar", "className":"com.yqu.sparkhive.HelloSparkHiveDriver", "args":["yqu9"] }' http://10.211.55.101:8998/batches { "id":3, "state":"running", "appId":null, "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ "stdout: ", " stderr: " ] }
查询批处理会话列表
curl http://10.211.55.101:8998/batches { "from":0, "total":2, "sessions":[ { "id":1, "state":"dead", "appId":null, "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ " at org.apache.spark.util.Utils$.doFetchFile(Utils.scala:692)", " at org.apache.spark.deploy.DependencyUtils$.downloadFile(DependencyUtils.scala:131)", " at org.apache.spark.deploy.SparkSubmit$$anonfun$prepareSubmitEnvironment$7.apply(SparkSubmit.scala:401)", " at org.apache.spark.deploy.SparkSubmit$$anonfun$prepareSubmitEnvironment$7.apply(SparkSubmit.scala:401)", " at scala.Option.map(Option.scala:146)", " at org.apache.spark.deploy.SparkSubmit$.prepareSubmitEnvironment(SparkSubmit.scala:400)", " at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:170)", " at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:136)", " at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)", " stderr: " ] }, { "id":3, "state":"running", "appId":null, "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ "2018-07-18 03:48:45 INFO MapOutputTrackerMasterEndpoint:54 - MapOutputTrackerMasterEndpoint stopped!", "2018-07-18 03:48:45 INFO MemoryStore:54 - MemoryStore cleared", "2018-07-18 03:48:45 INFO BlockManager:54 - BlockManager stopped", "2018-07-18 03:48:45 INFO BlockManagerMaster:54 - BlockManagerMaster stopped", "2018-07-18 03:48:45 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint:54 - OutputCommitCoordinator stopped!", "2018-07-18 03:48:45 INFO SparkContext:54 - Successfully stopped SparkContext", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Shutdown hook called", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Deleting directory /tmp/spark-ffa75451-735a-4edc-9572-32d1a07ba748", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Deleting directory /tmp/spark-7567b293-c81e-4516-a644-531e9fc584d1", " stderr: " ] } ] }
曾经尝试过使用file:///home/vagrant/HelloSparkHive/build/libs/hello-spark-hive-0.1.0.jar，但是报错："requirement failed: Local path /home/vagrant/HelloSparkHive/build/libs/hello-spark-hive-0.1.0.jar cannot be added to user sessions."，有可能不支持本地jar文件。
查询特定批处理会话信息
curl http://10.211.55.101:8998/batches/3 { "id":3, "state":"success", "appId":null, "appInfo":{ "driverLogUrl":null, "sparkUiUrl":null }, "log":[ "2018-07-18 03:48:45 INFO MapOutputTrackerMasterEndpoint:54 - MapOutputTrackerMasterEndpoint stopped!", "2018-07-18 03:48:45 INFO MemoryStore:54 - MemoryStore cleared", "2018-07-18 03:48:45 INFO BlockManager:54 - BlockManager stopped", "2018-07-18 03:48:45 INFO BlockManagerMaster:54 - BlockManagerMaster stopped", "2018-07-18 03:48:45 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint:54 - OutputCommitCoordinator stopped!", "2018-07-18 03:48:45 INFO SparkContext:54 - Successfully stopped SparkContext", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Shutdown hook called", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Deleting directory /tmp/spark-ffa75451-735a-4edc-9572-32d1a07ba748", "2018-07-18 03:48:45 INFO ShutdownHookManager:54 - Deleting directory /tmp/spark-7567b293-c81e-4516-a644-531e9fc584d1", " stderr: " ] }
查询特定批处理会话状态
curl http://10.211.55.101:8998/batches/3/state { "id":3, "state":"success" }
查看WEB UI
删除回话
curl -X DELETE http://10.211.55.101:8998/sessions/0 { "msg":"deleted" } curl -X DELETE http://10.211.55.101:8998/batches/3 { "msg":"deleted" }