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From "Victor Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14062) RpcServer.Listener.doAccept get blocked by LinkedList.remove
Date Sun, 12 Jul 2015 23:28:04 GMT
Victor Xu created HBASE-14062:
---------------------------------

             Summary: RpcServer.Listener.doAccept get blocked by LinkedList.remove
                 Key: HBASE-14062
                 URL: https://issues.apache.org/jira/browse/HBASE-14062
             Project: HBase
          Issue Type: Bug
          Components: IPC/RPC
    Affects Versions: 0.98.12
            Reporter: Victor Xu


We saw these blocked info in our jstack output:
{noformat}
"RpcServer.listener,port=60020" daemon prio=10 tid=0x00007f158097b800 nid=0x2cd05 waiting
for monitor entry [0x0000000046374000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.hadoop.hbase.ipc.RpcServer$Listener.doAccept(RpcServer.java:833)
        - waiting to lock <0x00000002bb094ac8> (a java.util.Collections$SynchronizedList)
        at org.apache.hadoop.hbase.ipc.RpcServer$Listener.run(RpcServer.java:748)
{noformat}

And the owner of the lock is LinkedList.remove:
{noformat}
"RpcServer.reader=9,port=60020" daemon prio=10 tid=0x00007f1580394000 nid=0x2cc19 runnable
[0x0000000043b4c000]
   java.lang.Thread.State: RUNNABLE
        at java.util.LinkedList.remove(LinkedList.java:363)
        at java.util.Collections$SynchronizedCollection.remove(Collections.java:1639)
        - locked <0x00000002bb094ac8> (a java.util.Collections$SynchronizedList)
        at org.apache.hadoop.hbase.ipc.RpcServer.closeConnection(RpcServer.java:1992)
        - locked <0x00000002bb094ac8> (a java.util.Collections$SynchronizedList)
        at org.apache.hadoop.hbase.ipc.RpcServer$Listener.doRead(RpcServer.java:867)
        at org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.doRunLoop(RpcServer.java:645)
        - locked <0x00000002bae09a30> (a org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader)
        at org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.run(RpcServer.java:620)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)
{noformat}
This issue blocked RS once in a while and I had to restart it whenever it happens.
Any suggestions?



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