I decided to do a quick check on the attempt processing one of oozie's hive actions:   org.apache.hadoop.mapred.YarnChild 10.0.0.9 33024 attempt_1431965085423_0015_m_000000_0 2   ...and collected a quick stack trace which shows the hive client does indeed run inproc with the JVM running the attempt:   "main" prio=10 tid=0x00007f4dbc027800 nid=0xac2c in Object.wait() [0x00007f4dc5c2b000]    java.lang.Thread.State: WAITING (on object monitor)     at java.lang.Object.wait(Native Method)     - waiting on <0x00000000fe43fa48> (a org.apache.hadoop.ipc.Client$Call)     at java.lang.Object.wait(Object.java:503)     at org.apache.hadoop.ipc.Client.call(Client.java:1454)     - locked <0x00000000fe43fa48> (a org.apache.hadoop.ipc.Client$Call)     at org.apache.hadoop.ipc.Client.call(Client.java:1399)     at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)     at com.sun.proxy.$Proxy32.getJobReport(Unknown Source)     at org.apache.hadoop.mapreduce.v2.api.impl.pb.client.MRClientProtocolPBClientImpl.getJobReport(MRClientProtocolPBClientImpl.java:133)     at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:606)     at org.apache.hadoop.mapred.ClientServiceDelegate.invoke(ClientServiceDelegate.java:323)     - locked <0x00000000ff3bafd0> (a org.apache.hadoop.mapred.ClientServiceDelegate)     at org.apache.hadoop.mapred.ClientServiceDelegate.getJobStatus(ClientServiceDelegate.java:422)     at org.apache.hadoop.mapred.YARNRunner.getJobStatus(YARNRunner.java:575)     at org.apache.hadoop.mapreduce.Cluster.getJob(Cluster.java:183)     at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:603)     at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:601)     at java.security.AccessController.doPrivileged(Native Method)     at javax.security.auth.Subject.doAs(Subject.java:415)     at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)     at org.apache.hadoop.mapred.JobClient.getJobUsingCluster(JobClient.java:601)     at org.apache.hadoop.mapred.JobClient.getJobInner(JobClient.java:611)     at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:636)     at org.apache.hadoop.hive.ql.exec.mr.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:288)     at org.apache.hadoop.hive.ql.exec.mr.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:547)     at org.apache.hadoop.hive.ql.exec.mr.ExecDriver.execute(ExecDriver.java:435)     at org.apache.hadoop.hive.ql.exec.mr.MapRedTask.execute(MapRedTask.java:137)     at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:160)     at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:85)     at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1604)     at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1364)     at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1177)     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1004)     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:994)     at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:247)     at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:199)     at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:410)     at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:345)     at org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:443)     at org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:459)     at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:739)     at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)     at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:616)     at org.apache.oozie.action.hadoop.HiveMain.runHive(HiveMain.java:323)     at org.apache.oozie.action.hadoop.HiveMain.run(HiveMain.java:284)     at org.apache.oozie.action.hadoop.LauncherMain.run(LauncherMain.java:39)     at org.apache.oozie.action.hadoop.HiveMain.main(HiveMain.java:66)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:606)     at org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:226)     at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)     at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:450)     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)     at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)     at java.security.AccessController.doPrivileged(Native Method)     at javax.security.auth.Subject.doAs(Subject.java:415)     at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)     at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)   Thanks ... 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I was mostly just curious so thank you for the reply. I always thought Hue submitted Oozie jobs to Oozie's REST endpoint...   I was just curious to know where the hive client runs in the context of an oozie hive action since I never saw hive start on the workernode where oozie's launcher (map attempt) was executing.   No biggie.   Thanks     ... View more