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Posted to dev@hbase.apache.org by "Guangxu Cheng (JIRA)" <ji...@apache.org> on 2017/03/17 12:26:41 UTC
[jira] [Created] (HBASE-17798) RpcServer.Listener.Reader can abort
due to CancelledKeyException
Guangxu Cheng created HBASE-17798:
-------------------------------------
Summary: 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: 0.98.24, 1.2.4, 1.3.0, 2.0.0
Reporter: Guangxu Cheng
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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