Details
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Bug
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Status: Closed
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Critical
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Resolution: Fixed
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0.23.0
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None
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Reviewed
Description
While running GridMixV3, one of the jobs got stuck for 15 hrs. After clicking on the Job-page, found one of its reduces to be stuck. Looking at syslog of the stuck reducer, found this:
Task-logs' head:
2011-09-19 17:57:22,002 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). 2011-09-19 17:57:22,002 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: ReduceTask metrics system started
Task-logs' tail:
2011-09-19 18:06:49,818 INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink as <DATANODE1> 2011-09-19 18:06:49,818 WARN org.apache.hadoop.hdfs.DFSClient: Error Recovery for block BP-1405370709-<NAMENODE>-1316452621953:blk_-7004355226367468317_79871 in pipeline <DATANODE2>, <DATANODE1>: bad datanode <DATANODE1> 2011-09-19 18:06:49,818 DEBUG org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtocol: lastAckedSeqno = 26870 2011-09-19 18:06:49,820 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <NAMENODE> from gridperf sending #454 2011-09-19 18:06:49,826 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <<NAMENODE> from gridperf got value #454 2011-09-19 18:06:49,827 DEBUG org.apache.hadoop.ipc.RPC: Call: getAdditionalDatanode 8 2011-09-19 18:06:49,827 DEBUG org.apache.hadoop.hdfs.DFSClient: Connecting to datanode <DATANODE2> 2011-09-19 18:06:49,827 DEBUG org.apache.hadoop.hdfs.DFSClient: Send buf size 131071 2011-09-19 18:06:49,833 WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer Exception java.io.EOFException: Premature EOF: no length prefix available at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:158) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:860) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:838) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:929) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:740) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:415) 2011-09-19 18:06:49,837 WARN org.apache.hadoop.mapred.YarnChild: Exception running child : java.io.EOFException: Premature EOF: no length prefix available at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:158) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:860) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:838) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:929) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:740) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:415) 2011-09-19 18:06:49,837 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <APPMASTER> from job_1316452677984_0862 sending #455 2011-09-19 18:06:49,839 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <APPMASTER> from job_1316452677984_0862 got value #455 2011-09-19 18:06:49,840 DEBUG org.apache.hadoop.ipc.RPC: Call: statusUpdate 3 2011-09-19 18:06:49,840 INFO org.apache.hadoop.mapred.Task: Runnning cleanup for the task 2011-09-19 18:06:49,840 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <NAMENODE> from gridperf sending #456 2011-09-19 18:06:49,858 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <NAMENODE> from gridperf got value #456 2011-09-19 18:06:49,858 DEBUG org.apache.hadoop.ipc.RPC: Call: delete 18 2011-09-19 18:06:49,858 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <APPMASTER> from job_1316452677984_0862 sending #457 2011-09-19 18:06:49,859 DEBUG org.apache.hadoop.ipc.Client: IPC Client (26613121) connection to <APPMASTER> from job_1316452677984_0862 got value #457 2011-09-19 18:06:49,859 DEBUG org.apache.hadoop.ipc.RPC: Call: reportDiagnosticInfo 1 2011-09-19 18:06:49,859 DEBUG org.apache.hadoop.metrics2.impl.MetricsSystemImpl: refCount=1 2011-09-19 18:06:49,859 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping ReduceTask metrics system... 2011-09-19 18:06:49,859 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping metrics source UgiMetrics 2011-09-19 18:06:49,859 DEBUG org.apache.hadoop.metrics2.impl.MetricsSystemImpl: class org.apache.hadoop.metrics2.lib.MetricsSourceBuilder$1 2011-09-19 18:06:49,860 DEBUG org.apache.hadoop.metrics2.util.MBeans: Unregistering Hadoop:service=ReduceTask,name=UgiMetrics 2011-09-19 18:06:49,860 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping metrics source JvmMetrics 2011-09-19 18:06:49,860 DEBUG org.apache.hadoop.metrics2.impl.MetricsSystemImpl: class org.apache.hadoop.metrics2.source.JvmMetrics 2011-09-19 18:06:49,860 DEBUG org.apache.hadoop.metrics2.util.MBeans: Unregistering Hadoop:service=ReduceTask,name=JvmMetrics 2011-09-19 18:06:49,860 DEBUG org.apache.hadoop.metrics2.util.MBeans: Unregistering Hadoop:service=ReduceTask,name=MetricsSystem,sub=Stats 2011-09-19 18:06:49,860 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: ReduceTask metrics system stopped. 2011-09-19 18:06:49,860 DEBUG org.apache.hadoop.metrics2.util.MBeans: Unregistering Hadoop:service=ReduceTask,name=MetricsSystem,sub=Control 2011-09-19 18:06:49,860 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: ReduceTask metrics system shutdown complete.
Which means that tasks is supposed to have stopped within 20 secs, whereas the process itself is stuck for more than 15 hours. From AM log, also found that this task was sending its update regularly. ps -ef | grep java was also showing that process is still alive.