Sergey Shelukhin created HDFS-14498:
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Summary: LeaseManager can loop forever on the file for which
create has failed
Key: HDFS-14498
URL: https://issues.apache.org/jira/browse/HDFS-14498
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.9.0
Reporter: Sergey Shelukhin
The logs from file creation are long gone due to infinite lease logging,
however it presumably failed... the client who was trying to write this file is
definitely long dead.
The version includes HDFS-4882.
We get this log pattern repeating infinitely:
{noformat}
2019-05-16 14:00:16,893 INFO
[org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@b27557f]
org.apache.hadoop.hdfs.server.namenode.LeaseManager: [Lease. Holder:
DFSClient_NONMAPREDUCE_-20898906_61, pending creates: 1] has expired hard limit
2019-05-16 14:00:16,893 INFO
[org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@b27557f]
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Recovering [Lease.
Holder: DFSClient_NONMAPREDUCE_-20898906_61, pending creates: 1], src=<snip>
2019-05-16 14:00:16,893 WARN
[org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@b27557f]
org.apache.hadoop.hdfs.StateChange: DIR* NameSystem.internalReleaseLease:
Failed to release lease for file <snip>. Committed blocks are waiting to be
minimally replicated. Try again later.
2019-05-16 14:00:16,893 WARN
[org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor@b27557f]
org.apache.hadoop.hdfs.server.namenode.LeaseManager: Cannot release the path
<snip> in the lease [Lease. Holder: DFSClient_NONMAPREDUCE_-20898906_61,
pending creates: 1]. It will be retried.
org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException: DIR*
NameSystem.internalReleaseLease: Failed to release lease for file <snip>.
Committed blocks are waiting to be minimally replicated. Try again later.
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.internalReleaseLease(FSNamesystem.java:3357)
at
org.apache.hadoop.hdfs.server.namenode.LeaseManager.checkLeases(LeaseManager.java:573)
at
org.apache.hadoop.hdfs.server.namenode.LeaseManager$Monitor.run(LeaseManager.java:509)
at java.lang.Thread.run(Thread.java:745)
$ grep -c "Recovering.*DFSClient_NONMAPREDUCE_-20898906_61, pending creates:
1" hdfs_nn*
hdfs_nn.log:1068035
hdfs_nn.log.2019-05-16-14:1516179
hdfs_nn.log.2019-05-16-15:1538350
{noformat}
Aside from an actual bug fix, it might make sense to make LeaseManager not log
so much, in case if there are more bugs like this...
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