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https://issues.apache.org/jira/browse/HDDS-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16658777#comment-16658777
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Lokesh Jain commented on HDDS-422:
----------------------------------
[~arpitagarwal] This is not a must fix. The issue is that readStateMachineData
fails while the leader is writing a chunk file to a state machine data. The
readStateMachineData is called by the leader for appending entries to follower.
On case of failure the append entries are retried and the exception will not
occur after the write chunk has completed.
We can resolve the issue for now as this is expected behaviour.
> ContainerStateMachine.readStateMachineData throws OverlappingFileLockException
> ------------------------------------------------------------------------------
>
> Key: HDDS-422
> URL: https://issues.apache.org/jira/browse/HDDS-422
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Datanode
> Reporter: Lokesh Jain
> Assignee: Lokesh Jain
> Priority: Major
> Labels: Arches-Deferral-Candidate
>
>
> {code:java}
> 2018-09-06 23:11:41,386 ERROR org.apache.ratis.server.impl.LogAppender:
> GRpcLogAppender(d95c60fd-0e23-4237-8135-e05a326b952d_9858 ->
> 954e7a3b-b20e-43a5-8f82-4381872aa7bb_9858) hit IOException while loadin
> g raft log
> org.apache.ratis.server.storage.RaftLogIOException:
> d95c60fd-0e23-4237-8135-e05a326b952d_9858: Failed readStateMachineData for
> (t:39, i:667)SMLOGENTRY, client-CD988394E416, cid=90
> at
> org.apache.ratis.server.storage.RaftLog$EntryWithData.getEntry(RaftLog.java:360)
> at
> org.apache.ratis.server.impl.LogAppender$LogEntryBuffer.getAppendRequest(LogAppender.java:165)
> at
> org.apache.ratis.server.impl.LogAppender.createRequest(LogAppender.java:214)
> at
> org.apache.ratis.grpc.server.GRpcLogAppender.appendLog(GRpcLogAppender.java:148)
> at
> org.apache.ratis.grpc.server.GRpcLogAppender.runAppenderImpl(GRpcLogAppender.java:92)
> at org.apache.ratis.server.impl.LogAppender.runAppender(LogAppender.java:101)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.nio.channels.OverlappingFileLockException
> at sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java:255)
> at sun.nio.ch.SharedFileLockTable.add(FileLockTable.java:152)
> at
> sun.nio.ch.AsynchronousFileChannelImpl.addToFileLockTable(AsynchronousFileChannelImpl.java:178)
> at
> sun.nio.ch.SimpleAsynchronousFileChannelImpl.implLock(SimpleAsynchronousFileChannelImpl.java:185)
> at
> sun.nio.ch.AsynchronousFileChannelImpl.lock(AsynchronousFileChannelImpl.java:118)
> at
> org.apache.hadoop.ozone.container.keyvalue.helpers.ChunkUtils.readData(ChunkUtils.java:176)
> at
> org.apache.hadoop.ozone.container.keyvalue.impl.ChunkManagerImpl.readChunk(ChunkManagerImpl.java:161)
> at
> org.apache.hadoop.ozone.container.keyvalue.KeyValueHandler.handleReadChunk(KeyValueHandler.java:598)
> at
> org.apache.hadoop.ozone.container.keyvalue.KeyValueHandler.handle(KeyValueHandler.java:201)
> at
> org.apache.hadoop.ozone.container.common.impl.HddsDispatcher.dispatch(HddsDispatcher.java:142)
> at
> org.apache.hadoop.ozone.container.common.transport.server.ratis.ContainerStateMachine.dispatchCommand(ContainerStateMachine.java:217)
> at
> org.apache.hadoop.ozone.container.common.transport.server.ratis.ContainerStateMachine.readStateMachineData(ContainerStateMachine.java:289)
> at
> org.apache.hadoop.ozone.container.common.transport.server.ratis.ContainerStateMachine.lambda$readStateMachineData$3(ContainerStateMachine.java:359)
> at
> java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> ... 1 more
> {code}
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