Yiqun Lin created HDFS-11044:
--------------------------------
Summary: TestRollingUpgrade fails intermittently
Key: HDFS-11044
URL: https://issues.apache.org/jira/browse/HDFS-11044
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Yiqun Lin
Assignee: Yiqun Lin
The test {{TestRollingUpgrade#testRollback}} fails intermittently in
trunk(https://builds.apache.org/job/PreCommit-HDFS-Build/17250/testReport/).
The stack info:
{code}
java.lang.AssertionError: Test resulted in an unexpected exit
at
org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1949)
at
org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1936)
at
org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1929)
at
org.apache.hadoop.hdfs.TestRollingUpgrade.testRollback(TestRollingUpgrade.java:351)
{code}
I looked into that, it seems there is some IOException happenning in writing
files to nn storages(Can see jenkins report). And then this exception will be
remenbered in {{ExitUtil.firstExitException}}. Finally when we do the cluster's
shutdown operations, this exception will be threw.
The exception info:
{code}
2016-10-21 12:54:02,300 [main] FATAL hdfs.MiniDFSCluster
(MiniDFSCluster.java:shutdown(1946)) - Test resulted in an unexpected exit
org.apache.hadoop.util.ExitUtil$ExitException: java.io.IOException: All the
storage failed while writing properties to VERSION file
at
org.apache.hadoop.hdfs.server.namenode.NNStorage.writeAll(NNStorage.java:1151)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.updateStorageVersion(FSImage.java:999)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:850)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:240)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:149)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:838)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:819)
at
org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:293)
at
org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:427)
{code}
The IOException is beacause that all the sotrage dir have be removed. IMO, one
of the reason is that when we writing some properties or write transactionId
to storage failed that lead the existing sotrage to be removed.
Since that in test {{TestRollingUpgrade#testRollback}} it will do many times
for restarting namenode operations, I'm not if it's normal here. But one way
the I am sure to fix this: We can use {{checkExitOnShutdown(false)}} to skip
the ExitException check. And this have been done in
{{TestRollingUpgrade#testRollingUpgradeWithQJM}}.
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