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https://issues.apache.org/jira/browse/HDFS-7187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maxim Ivanov resolved HDFS-7187.
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Resolution: Duplicate
Duplicate of https://issues.apache.org/jira/browse/HADOOP-10404
> DomainSocketWatcher thread crashes causing datanode to leak connection threads
> ------------------------------------------------------------------------------
>
> Key: HDFS-7187
> URL: https://issues.apache.org/jira/browse/HDFS-7187
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.3.0
> Reporter: Maxim Ivanov
>
> It seems that DomainSocketWatcher crashes, which makes all those short
> circuit threads to wait forever:
> {code}
> Exception in thread "Thread-22" java.util.ConcurrentModificationException
> at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1115)
> at java.util.TreeMap$ValueIterator.next(TreeMap.java:1160)
> at
> org.apache.hadoop.net.unix.DomainSocketWatcher$1.run(DomainSocketWatcher.java:465)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> In the meantime DataXceiver threads look like this (their number grows up to
> connection threads limit):
> {code}
> "DataXceiver for client unix:/var/run/hadoop-hdfs/datanode50010.socket
> [Waiting for operation #1]" daemon prio=10 tid=0x00007fb3c14d3800 nid=0x997e
> waiting on condition [0x00007fb2a1d25000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x0000000744d1d600> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
> at
> java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
> at
> java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
> at
> org.apache.hadoop.net.unix.DomainSocketWatcher.add(DomainSocketWatcher.java:286)
> at
> org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.createNewMemorySegment(ShortCircuitRegistry.java:283)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.requestShortCircuitShm(DataXceiver.java:386)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opRequestShortCircuitShm(Receiver.java:172)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:92)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:229)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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