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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11277) RPCServer threads can wedge under high load
Date Fri, 30 May 2014 18:25:01 GMT
Andrew Purtell created HBASE-11277:
--------------------------------------

             Summary: RPCServer threads can wedge under high load
                 Key: HBASE-11277
                 URL: https://issues.apache.org/jira/browse/HBASE-11277
             Project: HBase
          Issue Type: Bug
            Reporter: Andrew Purtell


This is with 0.98.0 in an insecure setup with 7u55 and 7u60. Under high load, RPCServer threads
can wedge, fail to make progess, and consume 100% CPU time on a core indefinitely. 

Dumping threads, all threads are in BLOCKED or IN_NATIVE state. The IN_NATIVE threads are
mostly in EPollArrayWrapper.epollWait or FileDispatcherImpl.read0. The number of threads found
in FileDispatcherImpl.read0 correspond to the number of runaway threads expected based on
looking at 'top' output. These look like:

{noformat}
Thread 64758: (state = IN_NATIVE)
 - sun.nio.ch.FileDispatcherImpl.read0(java.io.FileDescriptor, long, int) @bci=0 (Compiled
frame; information may be imprecise)
 - sun.nio.ch.SocketDispatcher.read(java.io.FileDescriptor, long, int) @bci=4, line=39 (Compiled
frame)
 - sun.nio.ch.IOUtil.readIntoNativeBuffer(java.io.FileDescriptor, java.nio.ByteBuffer, long,
sun.nio.ch.NativeDispatcher) @bci=114, line=223 (Compil
ed frame)
 - sun.nio.ch.IOUtil.read(java.io.FileDescriptor, java.nio.ByteBuffer, long, sun.nio.ch.NativeDispatcher)
@bci=48, line=197 (Compiled frame)
 - sun.nio.ch.SocketChannelImpl.read(java.nio.ByteBuffer) @bci=234, line=379 (Compiled frame)
 - org.apache.hadoop.hbase.ipc.RpcServer.channelRead(java.nio.channels.ReadableByteChannel,
java.nio.ByteBuffer) @bci=12, line=2224 (Compiled frame)
 - org.apache.hadoop.hbase.ipc.RpcServer$Connection.readAndProcess() @bci=509, line=1488 (Compiled
frame)
 - org.apache.hadoop.hbase.ipc.RpcServer$Listener.doRead(java.nio.channels.SelectionKey) @bci=23,
line=790 (Compiled frame)
 - org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.doRunLoop() @bci=97, line=581 (Compiled
frame)
 - org.apache.hadoop.hbase.ipc.RpcServer$Listener$Reader.run() @bci=1, line=556 (Interpreted
frame)
 - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker)
@bci=95, line=1145 (Interpreted frame)
 - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=615 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)
{noformat}



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