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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11802) DomainSocketWatcher#watcherThread can encounter IllegalStateException in finally block when calling sendCallback
Date Wed, 08 Apr 2015 15:25:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485380#comment-14485380
] 

Eric Payne commented on HADOOP-11802:
-------------------------------------

Sorry, I just noticed that the following was the first exception in the series:
{noformat}
2015-04-02 11:48:09,866 [DataXceiver for client unix:/home/gs/var/run/hdfs/dn_socket [Waiting
for operation #1]] ERROR datanode.DataNode: gsta70851.tan.ygrid.yahoo.com:1004:DataXceiver
error processing REQUEST_SHORT_CIRCUIT_SHM operation  src: unix:/home/gs/var/run/hdfs/dn_socket
dst: <local>
java.net.SocketException: write(2) error: Broken pipe
        at org.apache.hadoop.net.unix.DomainSocket.writeArray0(Native Method)
        at org.apache.hadoop.net.unix.DomainSocket.access$300(DomainSocket.java:45)
        at org.apache.hadoop.net.unix.DomainSocket$DomainOutputStream.write(DomainSocket.java:601)
        at com.google.protobuf.CodedOutputStream.refreshBuffer(CodedOutputStream.java:833)
        at com.google.protobuf.CodedOutputStream.flush(CodedOutputStream.java:843)
        at com.google.protobuf.AbstractMessageLite.writeDelimitedTo(AbstractMessageLite.java:91)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.sendShmSuccessResponse(DataXceiver.java:380)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.requestShortCircuitShm(DataXceiver.java:418)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opRequestShortCircuitShm(Receiver.java:214)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:95)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:235)
{noformat}


> DomainSocketWatcher#watcherThread can encounter IllegalStateException in finally block
when calling sendCallback
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11802
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11802
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>
> In the main finally block of the {{DomainSocketWatcher#watcherThread}}, the call to {{sendCallback}}
can encounter an {{IllegalStateException}}, and leave some cleanup tasks undone.
> {code}
>       } finally {
>         lock.lock();
>         try {
>           kick(); // allow the handler for notificationSockets[0] to read a byte
>           for (Entry entry : entries.values()) {
>             // We do not remove from entries as we iterate, because that can
>             // cause a ConcurrentModificationException.
>             sendCallback("close", entries, fdSet, entry.getDomainSocket().fd);
>           }
>           entries.clear();
>           fdSet.close();
>         } finally {
>           lock.unlock();
>         }
>       }
> {code}
> The exception causes {{watcherThread}} to skip the calls to {{entries.clear()}} and {{fdSet.close()}}.
> {code}
> 2015-04-02 11:48:09,941 [DataXceiver for client unix:/home/gs/var/run/hdfs/dn_socket
[Waiting for operation #1]] INFO DataNode.clienttrace: cliID: DFSClient_NONMAPREDUCE_-807148576_1,
src: 127.0.0.1, dest: 127.0.0.1, op: REQUEST_SHORT_CIRCUIT_SHM, shmId: n/a, srvID: e6b6cdd7-1bf8-415f-a412-32d8493554df,
success: false
> 2015-04-02 11:48:09,941 [Thread-14] ERROR unix.DomainSocketWatcher: Thread[Thread-14,5,main]
terminating on unexpected exception
> java.lang.IllegalStateException: failed to remove b845649551b6b1eab5c17f630e42489d
>         at com.google.common.base.Preconditions.checkState(Preconditions.java:145)
>         at org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.removeShm(ShortCircuitRegistry.java:119)
>         at org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry$RegisteredShm.handle(ShortCircuitRegistry.java:102)
>         at org.apache.hadoop.net.unix.DomainSocketWatcher.sendCallback(DomainSocketWatcher.java:402)
>         at org.apache.hadoop.net.unix.DomainSocketWatcher.access$1100(DomainSocketWatcher.java:52)
>         at org.apache.hadoop.net.unix.DomainSocketWatcher$2.run(DomainSocketWatcher.java:522)
>         at java.lang.Thread.run(Thread.java:722)
> {code}
> Please note that this is not a duplicate of HADOOP-11333, HADOOP-11604, or HADOOP-10404.
The cluster installation is running code with all of these fixes.



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