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https://issues.apache.org/jira/browse/HBASE-17798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15935215#comment-15935215
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Hudson commented on HBASE-17798:
--------------------------------
SUCCESS: Integrated in Jenkins build HBase-Trunk_matrix #2714 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/2714/])
HBASE-17798 RpcServer.Listener.Reader can abort due to (tedyu: rev
1cfd22bf43c9b64afae35d9bf16f764d0da80cab)
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/SimpleRpcServer.java
> RpcServer.Listener.Reader can abort due to CancelledKeyException
> ----------------------------------------------------------------
>
> Key: HBASE-17798
> URL: https://issues.apache.org/jira/browse/HBASE-17798
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0, 1.3.0, 1.2.4, 0.98.24
> Reporter: Guangxu Cheng
> Assignee: Guangxu Cheng
> Fix For: 1.4.0, 2.0
>
> Attachments: 17798-master-v2.patch, connections.png,
> HBASE-17798-0.98-v1.patch, HBASE-17798-0.98-v2.patch,
> HBASE-17798-branch-1-v1.patch, HBASE-17798-branch-1-v2.patch,
> HBASE-17798-master-v1.patch, HBASE-17798-master-v2.patch
>
>
> In our production cluster(0.98), some of the requests were unacceptable
> because RpcServer.Listener.Reader were aborted.
> getReader() will return the next reader to deal with request.
> The implementation of getReader() as below：
> {code:title=RpcServer.java|borderStyle=solid}
> // The method that will return the next reader to work with
> // Simplistic implementation of round robin for now
> Reader getReader() {
> currentReader = (currentReader + 1) % readers.length;
> return readers[currentReader];
> }
> {code}
> If one of the readers abort, then it will lead to fall on the reader's
> request will never be dealt with.
> Why does RpcServer.Listener.Reader abort?We add the debug log to get it.
> After a while, we got the following exception:
> {code}
> 2017-03-10 08:05:13,247 ERROR [RpcServer.reader=3,port=60020] ipc.RpcServer:
> RpcServer.listener,port=60020: unexpectedly error in Reader(Throwable)
> java.nio.channels.CancelledKeyException
> at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73)
> at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:87)
> at java.nio.channels.SelectionKey.isReadable(SelectionKey.java:289)
> at
> org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.doRunLoop(RpcServer.java:592)
> at
> org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.run(RpcServer.java:566)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> So, when deal with the request in reader, we should handle
> CanceledKeyException.
> ----------
> versions 1.x and 2.0 will log and retrun when dealing with the
> InterruptedException in Reader#doRunLoop after HBASE-10521. It will lead to
> the same problem.
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