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https://issues.apache.org/jira/browse/HBASE-14062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14625860#comment-14625860
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Victor Xu commented on HBASE-14062:
-----------------------------------
Yes, you are right. Different threads held the same lock in different jstack
outputs:
{noformat}
jstack.log-"RpcServer.reader=9,port=60020" daemon prio=10
tid=0x00007f1580394000 nid=0x2cc19 runnable [0x0000000043b4c000]
jstack.log- java.lang.Thread.State: RUNNABLE
jstack.log- at java.util.LinkedList.remove(LinkedList.java:363)
jstack.log- at
java.util.Collections$SynchronizedCollection.remove(Collections.java:1639)
jstack.log: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
jstack.log- at
org.apache.hadoop.hbase.ipc.RpcServer.closeConnection(RpcServer.java:1992)
jstack.log: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
--
jstack.log.1-"RpcServer.reader=0,port=60020" daemon prio=10
tid=0x00007f1580263000 nid=0x2cc10 runnable [0x0000000043243000]
jstack.log.1- java.lang.Thread.State: RUNNABLE
jstack.log.1- at java.util.LinkedList.remove(LinkedList.java:363)
jstack.log.1- at
java.util.Collections$SynchronizedCollection.remove(Collections.java:1639)
jstack.log.1: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
jstack.log.1- at
org.apache.hadoop.hbase.ipc.RpcServer.closeConnection(RpcServer.java:1992)
jstack.log.1: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
--
jstack.log.2-"RpcServer.reader=6,port=60020" daemon prio=10
tid=0x00007f1580342800 nid=0x2cc16 runnable [0x0000000043849000]
jstack.log.2- java.lang.Thread.State: RUNNABLE
jstack.log.2- at java.util.LinkedList.remove(LinkedList.java:363)
jstack.log.2- at
java.util.Collections$SynchronizedCollection.remove(Collections.java:1639)
jstack.log.2: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
jstack.log.2- at
org.apache.hadoop.hbase.ipc.RpcServer.closeConnection(RpcServer.java:1992)
jstack.log.2: - locked <0x00000002bb094ac8> (a
java.util.Collections$SynchronizedList)
{noformat}
> RpcServer.Listener.doAccept get blocked by LinkedList.remove
> ------------------------------------------------------------
>
> Key: HBASE-14062
> URL: https://issues.apache.org/jira/browse/HBASE-14062
> Project: HBase
> Issue Type: Bug
> Components: IPC/RPC
> Affects Versions: 0.98.12
> Reporter: Victor Xu
> Attachments: hbase.log, jstack.log
>
>
> We saw these blocked info in our jstack output:
> {noformat}
> "RpcServer.listener,port=60020" daemon prio=10 tid=0x00007f158097b800
> nid=0x2cd05 waiting for monitor entry [0x0000000046374000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.hbase.ipc.RpcServer$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. It seems like a bug. Any suggestions?
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