Andrey Klochkov created MAPREDUCE-4467:
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Summary: IndexCache failures due to missing synchronization
Key: MAPREDUCE-4467
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4467
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: nodemanager
Affects Versions: 0.23.2
Reporter: Andrey Klochkov
TestMRJobs.testSleepJob fails randomly due to synchronization error in
IndexCache:
{code}
2012-07-20 19:32:34,627 ERROR [New I/O server worker #2-1]
mapred.ShuffleHandler (ShuffleHandler.java:exceptionCaught(528)) - Shuffle
error:
java.lang.IllegalMonitorStateException
at java.lang.Object.wait(Native Method)
at
org.apache.hadoop.mapred.IndexCache.getIndexInformation(IndexCache.java:74)
at
org.apache.hadoop.mapred.ShuffleHandler$Shuffle.sendMapOutput(ShuffleHandler.java:471)
at
org.apache.hadoop.mapred.ShuffleHandler$Shuffle.messageReceived(ShuffleHandler.java:397)
at
org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:148)
at
org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:116)
at
org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:302)
at
org.jboss.netty.handler.codec.replay.ReplayingDecoder.unfoldAndfireMessageReceived(ReplayingDecoder.java:522)
at
org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:506)
at
org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:443)
at
org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)
at
org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)
at
org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
{code}
A related issue is MAPREDUCE-4384. The change introduced there removed
"synchronized" keyword and hence "info.wait()" call fails. Tbis needs to be
wrapped into a "synchronized" block.
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