Xiao Chen created HDFS-12369:
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Summary: Edit log corruption due to hard lease recovery of
not-closed file
Key: HDFS-12369
URL: https://issues.apache.org/jira/browse/HDFS-12369
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Xiao Chen
Assignee: Xiao Chen
HDFS-6257 and HDFS-7707 worked hard to prevent corruption from combinations of
client operations.
Recently, we have observed NN not able to start with the following exception:
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2017-08-17 14:32:18,418 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode:
Failed to start namenode.
java.io.FileNotFoundException: File does not exist:
/home/Events/CancellationSurvey_MySQL/2015/12/31/.part-00000.9nlJ3M
at
org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:66)
at
org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:56)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:429)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:232)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:141)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:897)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:750)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:318)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1125)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:789)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:614)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:676)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:844)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:823)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1547)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1615)
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Quoting a nicely analysed edits:
{quote}
In the edits logged about 1 hour later, we see this failing OP_CLOSE. The
sequence in the edits shows the file going through:
OPEN
ADD_BLOCK
CLOSE
ADD_BLOCK # perhaps this was an append
DELETE
(about 1 hour later) CLOSE
It is interesting that there was no CLOSE logged before the delete.
{quote}
Grepping that file name, it turns out the close was triggered by lease reaching
hard limit.
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2017-08-16 15:05:45,927 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
Recovering [Lease. Holder: DFSClient_NONMAPREDUCE_-1997177597_28, pending
creates: 75],
src=/home/Events/CancellationSurvey_MySQL/2015/12/31/.part-00000.9nlJ3M
2017-08-16 15:05:45,927 WARN org.apache.hadoop.hdfs.StateChange: BLOCK*
internalReleaseLease: All existing blocks are COMPLETE, lease removed, file
/home/Events/CancellationSurvey_MySQL/2015/12/31/.part-00000.9nlJ3M closed.
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