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From Rahul Ravindran <rahu...@yahoo.com>
Subject IOException with HDFS-Sink:flushOrSync
Date Tue, 07 May 2013 15:42:50 GMT
Hi,
   We have noticed this a few times now where we appear to have an IOException from HDFS
and this stops draining the channel until the flume process is restarted. Below are the logs:
namenode-v01-00b is the active namenode (namenode-v01-00a is standby). We are using Quorum
Journal Manager for our Namenode HA, but there was no Namenode failover which was initiated.
If this is an expected error, should flume handle it and gracefully retry (thereby not requiring
a restart)?
Thanks,
~Rahul.

7 May 2013 06:35:02,494 WARN  [hdfs-hdfs-sink4-call-runner-2] (org.apache.flume.sink.hdfs.BucketWriter.append:378)
 - Caught IOException writing to HDFSWriter (IOException flush:java.io.IOException: Failed
on local exception: java.nio.channels.ClosedByInterruptException; Host Details : local host
is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
). Closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp)
and rethrowing exception.
07 May 2013 06:35:02,494 WARN  [hdfs-hdfs-sink4-call-runner-2] (org.apache.flume.sink.hdfs.BucketWriter.append:384)
 - Caught IOException while closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp).
Exception follows.
java.io.IOException: IOException flush:java.io.IOException: Failed on local exception: java.nio.channels.ClosedByInterruptException;
Host Details : local host is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
  at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1617)
  at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1499)
  at org.apache.hadoop.hdfs.DFSOutputStream.sync(DFSOutputStream.java:1484)
  at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:116)
  at org.apache.flume.sink.hdfs.HDFSDataStream.sync(HDFSDataStream.java:95)
  at org.apache.flume.sink.hdfs.BucketWriter.doFlush(BucketWriter.java:345)
  at org.apache.flume.sink.hdfs.BucketWriter.access$500(BucketWriter.java:53)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:310)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.runPrivileged(BucketWriter.java:143)
  at org.apache.flume.sink.hdfs.BucketWriter.flush(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:396)
  at org.apache.flume.sink.hdfs.HDFSEventSink$2.call(HDFSEventSink.java:729)
  at org.apache.flume.sink.hdfs.HDFSEventSink$2.call(HDFSEventSink.java:727)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)
07 May 2013 06:35:02,495 WARN  [SinkRunner-PollingRunner-DefaultSinkProcessor] (org.apache.flume.sink.hdfs.HDFSEventSink.process:456)
 - HDFS IO error
java.io.IOException: IOException flush:java.io.IOException: Failed on local exception: java.nio.channels.ClosedByInterruptException;
Host Details : local host is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
  at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1617)
  at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1499)
  at org.apache.hadoop.hdfs.DFSOutputStream.sync(DFSOutputStream.java:1484)
  at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:116)
  at org.apache.flume.sink.hdfs.HDFSDataStream.sync(HDFSDataStream.java:95)
  at org.apache.flume.sink.hdfs.BucketWriter.doFlush(BucketWriter.java:345)
  at org.apache.flume.sink.hdfs.BucketWriter.access$500(BucketWriter.java:53)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:310)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.runPrivileged(BucketWriter.java:143)
  at org.apache.flume.sink.hdfs.BucketWriter.flush(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:396)
  at org.apache.flume.sink.hdfs.HDFSEventSink$2.call(HDFSEventSink.java:729)
  at org.apache.flume.sink.hdfs.HDFSEventSink$2.call(HDFSEventSink.java:727)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)
07 May 2013 06:35:05,350 WARN  [hdfs-hdfs-sink1-call-runner-5] (org.apache.flume.sink.hdfs.BucketWriter.append:378)
 - Caught IOException writing to HDFSWriter (IOException flush:java.io.IOException: Failed
on local exception: java.nio.channels.ClosedByInterruptException; Host Details : local host
is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00b.a.com":8020;
). Closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-1//event.1367891734999.tmp)
and rethrowing exception.
07 May 2013 06:35:05,351 WARN  [hdfs-hdfs-sink1-call-runner-5] (org.apache.flume.sink.hdfs.BucketWriter.append:384)
 - Caught IOException while closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-1//event.1367891734999.tmp).
Exception follows.
java.io.IOException: IOException flush:java.io.IOException: Failed on local exception: java.nio.channels.ClosedByInterruptException;
Host Details : local host is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00b.a.com":8020;
  at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1617)
  at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1499)
  at org.apache.hadoop.hdfs.DFSOutputStream.sync(DFSOutputStream.java:1484)
  at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:116)
  at org.apache.flume.sink.hdfs.HDFSDataStream.sync(HDFSDataStream.java:95)
  at org.apache.flume.sink.hdfs.BucketWriter.doFlush(BucketWriter.java:345)
  at org.apache.flume.sink.hdfs.BucketWriter.access$500(BucketWriter.java:53)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:310)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.runPrivileged(BucketWriter.java:143)
  at org.apache.flume.sink.hdfs.BucketWriter.flush(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.HDFSEventSink$3.call(HDFSEventSink.java:743)
  at org.apache.flume.sink.hdfs.HDFSEventSink$3.call(HDFSEventSink.java:741)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)
07 May 2013 06:35:05,352 WARN  [SinkRunner-PollingRunner-DefaultSinkProcessor] (org.apache.flume.sink.hdfs.HDFSEventSink.process:456)
 - HDFS IO error
java.io.IOException: IOException flush:java.io.IOException: Failed on local exception: java.nio.channels.ClosedByInterruptException;
Host Details : local host is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00b.a.com":8020;
  at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1617)
  at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1499)
  at org.apache.hadoop.hdfs.DFSOutputStream.sync(DFSOutputStream.java:1484)
  at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:116)
  at org.apache.flume.sink.hdfs.HDFSDataStream.sync(HDFSDataStream.java:95)
  at org.apache.flume.sink.hdfs.BucketWriter.doFlush(BucketWriter.java:345)
  at org.apache.flume.sink.hdfs.BucketWriter.access$500(BucketWriter.java:53)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:310)
  at org.apache.flume.sink.hdfs.BucketWriter$4.run(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.BucketWriter.runPrivileged(BucketWriter.java:143)
  at org.apache.flume.sink.hdfs.BucketWriter.flush(BucketWriter.java:308)
  at org.apache.flume.sink.hdfs.HDFSEventSink$3.call(HDFSEventSink.java:743)
  at org.apache.flume.sink.hdfs.HDFSEventSink$3.call(HDFSEventSink.java:741)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)
07 May 2013 06:35:07,497 WARN  [hdfs-hdfs-sink4-call-runner-8] (org.apache.flume.sink.hdfs.BucketWriter.append:378)
 - Caught IOException writing to HDFSWriter (IOException flush:java.io.IOException: Failed
on local exception: java.nio.channels.ClosedByInterruptException; Host Details : local host
is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
). Closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp)
and rethrowing exception.
07 May 2013 06:35:07,497 WARN  [hdfs-hdfs-sink4-call-runner-8] (org.apache.flume.sink.hdfs.BucketWriter.append:384)
 - Caught IOException while closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp).
Exception follows.
java.io.IOException: IOException flush:java.io.IOException: Failed on local exception: java.nio.channels.ClosedByInterruptException;
Host Details : local host is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
  at org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:1617)
  at org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:1499)
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