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From "Lin Yiqun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10181) TestHFlush frequently fails due to theadInterrupt
Date Fri, 18 Mar 2016 03:07:33 GMT
Lin Yiqun created HDFS-10181:
--------------------------------

             Summary: TestHFlush frequently fails due to theadInterrupt
                 Key: HDFS-10181
                 URL: https://issues.apache.org/jira/browse/HDFS-10181
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun


The test {{TestFLush}} frequently fails in recent patchs. I looked for the failed log records.
I found there were two reason lead this test {{TestFLush#testHFlushInterrupted}} to be failed.
And this method failure is the main reason that {{TestFLush}} not pass test. The two failed
reasons is below:
{code}
Tests run: 14, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 30.325 sec <<< FAILURE!
- in org.apache.hadoop.hdfs.TestHFlush
testHFlushInterrupted(org.apache.hadoop.hdfs.TestHFlush)  Time elapsed: 0.864 sec  <<<
ERROR!
java.io.IOException: The stream is closed
	at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:118)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	at java.io.DataOutputStream.flush(DataOutputStream.java:123)
	at java.io.FilterOutputStream.close(FilterOutputStream.java:158)
	at org.apache.hadoop.hdfs.DataStreamer.closeStream(DataStreamer.java:877)
	at org.apache.hadoop.hdfs.DataStreamer.closeInternal(DataStreamer.java:726)
	at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:721)
{code}

{code}
testHFlushInterrupted(org.apache.hadoop.hdfs.TestHFlush)  Time elapsed: 0.862 sec  <<<
ERROR!
java.nio.channels.ClosedByInterruptException: null
	at java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:202)
	at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:501)
	at org.apache.hadoop.net.SocketOutputStream$Writer.performIO(SocketOutputStream.java:63)
	at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:142)
	at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:159)
	at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:117)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	at java.io.DataOutputStream.flush(DataOutputStream.java:123)
	at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:653)
{code}

I analysed them, can be simplify described as below:

* The IOException happens when the stream is closed but the stream write operation continues.
* The ClosedByInterruptException happens when stream do hfulsh operations and thread interrupt
happens.

So we should catch these exceptions in stream {{hflush}} and {{write}} operations.



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