Maxim Ivanov created HDFS-7187:
----------------------------------
Summary: 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
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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
