zhaoyunjiong created HDFS-7429:
----------------------------------
Summary: DomainSocketWatcher.doPoll0 stuck
Key: HDFS-7429
URL: https://issues.apache.org/jira/browse/HDFS-7429
Project: Hadoop HDFS
Issue Type: Bug
Reporter: zhaoyunjiong
I found some of our DataNodes will run "exceeds the limit of concurrent
xciever", the limit is 4K.
After check the stack, I suspect that DomainSocketWatcher.doPoll0 stuck:
{quote}
"DataXceiver for client unix:/var/run/hadoop-hdfs/dn [Waiting for operation
#1]" daemon prio=10 tid=0x00007f55c5576000 nid=0x385d waiting on condition
[0x00007f558d5d4000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0000000740df9c90> (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:413)
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:232)
--
"DataXceiver for client unix:/var/run/hadoop-hdfs/dn [Waiting for operation
#1]" daemon prio=10 tid=0x00007f55c5575000 nid=0x37b3 runnable
[0x00007f558d3d2000]
java.lang.Thread.State: RUNNABLE
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:589)
at
org.apache.hadoop.net.unix.DomainSocketWatcher.kick(DomainSocketWatcher.java:350)
at
org.apache.hadoop.net.unix.DomainSocketWatcher.add(DomainSocketWatcher.java:303)
at
org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.createNewMemorySegment(ShortCircuitRegistry.java:283)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.requestShortCircuitShm(DataXceiver.java:413)
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:232)
"DataXceiver for client unix:/var/run/hadoop-hdfs/dn [Waiting for operation
#1]" daemon prio=10 tid=0x00007f55c5574000 nid=0x377a waiting on condition
[0x00007f558d7d6000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0000000740df9cb0> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at
org.apache.hadoop.net.unix.DomainSocketWatcher.add(DomainSocketWatcher.java:306)
at
org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.createNewMemorySegment(ShortCircuitRegistry.java:283)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.requestShortCircuitShm(DataXceiver.java:413)
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:232)
at java.lang.Thread.run(Thread.java:745)
"Thread-163852" daemon prio=10 tid=0x00007f55c811c800 nid=0x6757 runnable
[0x00007f55aef6e000]
java.lang.Thread.State: RUNNABLE
at org.apache.hadoop.net.unix.DomainSocketWatcher.doPoll0(Native Method)
at
org.apache.hadoop.net.unix.DomainSocketWatcher.access$800(DomainSocketWatcher.java:52)
at
org.apache.hadoop.net.unix.DomainSocketWatcher$1.run(DomainSocketWatcher.java:457)
at java.lang.Thread.run(Thread.java:745)
{quote}
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