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From Michael Segel <michael_se...@hotmail.com>
Subject RE: How to speedup Hbase query throughput
Date Tue, 17 May 2011 14:47:42 GMT

Sorry to jump in on the tail end.

What do you mean to say that they key is generated randomly?

I mean are you using a key and then applying a SHA-1 hash?

Which node is serving your -ROOT- and META tables?

Have you applied the GC hints recommended by Todd L in his blog?


Also you said:
'
And almost all these times are spent on DFSClient$BlockReader
to read data from DN.
'
What speed disks are you using and how many disks per node?
(you could be blocked on disk i/o.)


-Mike


----------------------------------------
> Date: Tue, 17 May 2011 07:33:34 -0700
> Subject: Re: How to speedup Hbase query throughput
> From: stack@duboce.net
> To: user@hbase.apache.org
>
> Nice analysis.
>
> Can you figure the most popular blocks requested? You could figure
> which files they belong too by grepping the blocks in namenode log.
>
> It is odd that you have the sort of a request profile if your loading
> was even. I'd expect the DN distribution to be even.
>
> Sounds like hdfs-347 would help for sure.
>
> St.Ack
>
>
> On Tue, May 17, 2011 at 6:57 AM, Weihua JIANG  wrote:
> > No. The key is generated randomly. In theory, it shall distributed to
> > all the RSs equally.
> >
> > Thanks
> > Weihua
> >
> > 2011/5/17 Ted Dunning :
> >> Are your keys arranged so that you have a problem with a hot region?
> >>
> >> On Mon, May 16, 2011 at 11:18 PM, Weihua JIANG wrote:
> >>
> >>> I have not applied hdfs-347, but done some other experiments.
> >>>
> >>> I increased client thread to 2000 to put enough pressure on cluster. I
> >>> disabled RS block cache. The total TPS is still low (with Month+User
> >>> as row key, it is about 1300 for 10 RS+DN and with User+Month it is
> >>> 700).
> >>>
> >>> I used BTrace to log the time spent on each HTable.get on RS. It shows
> >>> that most of the GETs use 20~50ms and there are many GETs need
> >>> >1000ms. And almost all these times are spent on DFSClient$BlockReader
> >>> to read data from DN. But, the network usage is not high (<100Mb/s, we
> >>> have a giganet), so network is not a problem.
> >>>
> >>> Since for each DFS block read, there is a socket connection created. I
> >>> use netstat to caculate the TCP connections on 50010 port (DN listen
> >>> port) for each RS+DN server. It shows that there are always one or two
> >>> DNs have high such connection number (>200) while other DNs have low
> >>> number (<20). And the high connection DNs have high disk I/O usage
> >>> (about 100%) while other DNs have low disk I/O.  This phenoma lasts
> >>> for days and the hot machine is always the hot one.
> >>>
> >>> The high connection number mainly comes from local region server
> >>> request (~80%).
> >>>
> >>> According to the source code of DFSClient, it prefers to use local DN
> >>> to fetch block. But, why certain machine is so popular? All my servers
> >>> have almost the same configuration.
> >>>
> >>> 2011/4/29 Stack :
> >>> > Yes, you could try applying hdfs-347 to your hdfs as J-D suggests.
 Do
> >>> > your numbers change if you run your client from more than one machine?
> >>> > St.Ack
> >>> >
> >>> > On Thu, Apr 28, 2011 at 2:56 PM, Jean-Daniel Cryans 
> >>> wrote:
> >>> >> Seems to be a case of HDFS-347.
> >>> >>
> >>> >> J-D
> >>> >>
> >>> >> On Thu, Apr 28, 2011 at 12:55 AM, Weihua JIANG 
> >>> wrote:
> >>> >>> After solving HBASE-3561, I successfully run hprof for RS and
DN.
> >>> >>> Since block cache is useless in my case, I disabled it. I rerun
my
> >>> >>> test with 14 RS+DNs and 1 client with 200 threads. But, the
throughput
> >>> >>> is still only about 700. No scalability shown in this case.
> >>> >>>
> >>> >>> Below is the hot spots in RS:
> >>> >>> CPU SAMPLES BEGIN (total = 1469756) Thu Apr 28 15:43:35 2011
> >>> >>> rank   self  accum   count trace method
> >>> >>>   1 44.33% 44.33%  651504 300612 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   2 19.88% 64.21%  292221 301351 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   3  8.88% 73.09%  130582 300554 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   4  4.43% 77.52%   65106 301248 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   5  4.43% 81.95%   65104 301249 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   6  4.43% 86.38%   65100 301247 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   7  4.43% 90.81%   65061 301266 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   8  4.32% 95.13%   63465 301565 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   9  2.31% 97.43%   33894 301555 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>  10  1.76% 99.19%   25841 301588 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>  11  0.48% 99.67%    7025 301443sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>  12  0.02% 99.69%     341 301568 sun.nio.ch.NativeThread.current
> >>> >>>  13  0.01% 99.71%     187 301535
> >>> >>> org.apache.hadoop.hbase.io.hfile.HFile$Reader.indexSize
> >>> >>>  14  0.01% 99.72%     186 301538
> >>> >>> org.apache.hadoop.hbase.io.hfile.HFile$Reader.indexSize
> >>> >>>  15  0.01% 99.73%     170 301625
> >>> org.apache.hadoop.util.DataChecksum.update
> >>> >>>  16  0.01% 99.74%     164 301579 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>  17  0.01% 99.75%     149 300938 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>
> >>> >>> TRACE 300612:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
> >>> >>>
> >>>  org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:305)
> >>> >>>
> >>>  java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> >>> >>>
> >>>  java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> >>> >>>        java.lang.Thread.run(Thread.java:619)
> >>> >>> TRACE 301351:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
> >>> >>>        java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> >>> >>>        java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
> >>> >>>        java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> >>> >>>        java.io.DataInputStream.read(DataInputStream.java:132)
> >>> >>>        org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:102)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.DFSClient$BlockReader.readChunk(DFSClient.java:1389)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:237)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.fill(FSInputChecker.java:176)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:193)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:158)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.DFSClient$BlockReader.read(DFSClient.java:1243)
> >>> >>> TRACE 300554:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1107)
> >>> >>> TRACE 301248:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.hbase.ipc.HBaseServer$Responder.run(HBaseServer.java:588)
> >>> >>> TRACE 301249:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
> >>> >>>
> >>>  org.apache.hadoop.hbase.ipc.HBaseServer$Listener.run(HBaseServer.java:414)
> >>> >>> TRACE 301247:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:498)
> >>> >>>
> >>>  org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:192)
> >>> >>>
> >>>  org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
> >>> >>>
> >>>  org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:708)
> >>> >>>
> >>>  org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> >>> >>> TRACE 301266:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
> >>> >>>        java.io.DataInputStream.readFully(DataInputStream.java:178)
> >>> >>>        java.io.DataInputStream.readLong(DataInputStream.java:399)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.protocol.DataTransferProtocol$PipelineAck.readFields(DataTransferProtocol.java:120)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2638)
> >>> >>> TRACE 301565:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
> >>> >>>        java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> >>> >>>        java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
> >>> >>>        java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> >>> >>>        java.io.DataInputStream.read(DataInputStream.java:132)
> >>> >>>        org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:102)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.DFSClient$BlockReader.readChunk(DFSClient.java:1389)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:237)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:189)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:158)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.DFSClient$BlockReader.read(DFSClient.java:1249)
> >>> >>>
> >>>  org.apache.hadoop.fs.FSInputChecker.readFully(FSInputChecker.java:384)
> >>> >>>
> >>> >>>
> >>> >>> And the hot spot of DN is:
> >>> >>> CPU SAMPLES BEGIN (total = 1123925) Thu Apr 28 15:43:49 2011
> >>> >>> rank   self  accum   count trace method
> >>> >>>   1 12.38% 12.38%  139155 301547 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   2 12.38% 24.76%  139154 301548 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   3 10.76% 35.53%  120969 300368 java.net.PlainSocketImpl.socketAccept
> >>> >>>   4 10.74% 46.27%  120753 301213 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   5 10.74% 57.01%  120744 301381 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   6 10.74% 67.76%  120744 301384 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   7 10.74% 78.50%  120743 301386 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>   8 10.68% 89.18%  120019 301383
> >>> sun.nio.ch.ServerSocketChannelImpl.accept0
> >>> >>>   9  8.11% 97.29%   91174 301475 sun.nio.ch.FileChannelImpl.transferTo0
> >>> >>>  10  1.44% 98.73%   16172 301479 java.io.FileInputStream.readBytes
> >>> >>>  11  0.40% 99.13%    4496 301477 java.io.FileInputStream.readBytes
> >>> >>>  12  0.23% 99.35%    2531 301497 sun.nio.ch.EPollArrayWrapper.epollWait
> >>> >>>  13  0.17% 99.53%    1958 301461 java.io.FileInputStream.readBytes
> >>> >>>  14  0.04% 99.57%     458 301468 java.io.UnixFileSystem.delete0
> >>> >>>  15  0.03% 99.59%     289 301520 java.lang.Thread.start0
> >>> >>>  16  0.02% 99.62%     278 301471
> >>> org.apache.hadoop.util.DataChecksum.update
> >>> >>>  17  0.02% 99.64%     204 301562
> >>> java.io.UnixFileSystem.getBooleanAttributes0
> >>> >>>  18  0.01% 99.65%     117 301587 sun.nio.ch.EPollArrayWrapper.epollCtl
> >>> >>>  19  0.01% 99.66%     113 301493 sun.nio.ch.FileDispatcher.write0
> >>> >>>
> >>> >>> TRACE 301547:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
> >>> >>>        java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> >>> >>>        java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
> >>> >>>        java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> >>> >>>        java.io.DataInputStream.read(DataInputStream.java:132)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readToBuf(BlockReceiver.java:267)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readNextPacket(BlockReceiver.java:314)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:378)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:534)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:417)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:122)
> >>> >>> TRACE 301548:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
> >>> >>>        java.io.DataInputStream.readFully(DataInputStream.java:178)
> >>> >>>        java.io.DataInputStream.readLong(DataInputStream.java:399)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.protocol.DataTransferProtocol$PipelineAck.readFields(DataTransferProtocol.java:120)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockReceiver$PacketResponder.run(BlockReceiver.java:894)
> >>> >>>        java.lang.Thread.run(Thread.java:619)
> >>> >>> TRACE 300368:
> >>> >>>
> >>>  java.net.PlainSocketImpl.socketAccept(PlainSocketImpl.java:Unknown line)
> >>> >>>        java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390)
> >>> >>>        java.net.ServerSocket.implAccept(ServerSocket.java:453)
> >>> >>>        java.net.ServerSocket.accept(ServerSocket.java:421)
> >>> >>>
> >>>  sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:34)
> >>> >>>
> >>>  sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369)
> >>> >>>
> >>>  sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341)
> >>> >>>        java.lang.Thread.run(Thread.java:619)
> >>> >>> TRACE 301213:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>
> >>>  org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:498)
> >>> >>>
> >>>  org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:192)
> >>> >>>
> >>>  org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
> >>> >>>
> >>>  org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:708)
> >>> >>>
> >>>  org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> >>> >>> TRACE 301381:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
> >>> >>>
> >>>  org.apache.hadoop.ipc.Server$Listener$Reader.run(Server.java:352)
> >>> >>> TRACE 301384:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>        org.apache.hadoop.ipc.Server$Responder.run(Server.java:636)
> >>> >>> TRACE 301386:
> >>> >>>
> >>>  sun.nio.ch.EPollArrayWrapper.epollWait(EPollArrayWrapper.java:Unknown line)
> >>> >>>        sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> >>> >>>        sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> >>> >>>        sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> >>> >>>        sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
> >>> >>>        org.apache.hadoop.ipc.Server$Listener.run(Server.java:468)
> >>> >>> TRACE 301383:
> >>> >>>
> >>>  sun.nio.ch.ServerSocketChannelImpl.accept0(ServerSocketChannelImpl.java:Unknown
> >>> >>> line)
> >>> >>>
> >>>  sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:145)
> >>> >>>
> >>>  sun.nio.ch.ServerSocketAdaptor.accept(ServerSocketAdaptor.java:84)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiverServer.run(DataXceiverServer.java:130)
> >>> >>>        java.lang.Thread.run(Thread.java:619)
> >>> >>> TRACE 301475:
> >>> >>>
> >>>  sun.nio.ch.FileChannelImpl.transferTo0(FileChannelImpl.java:Unknown line)
> >>> >>>
> >>>  sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:415)
> >>> >>>        sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:516)
> >>> >>>
> >>>  org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:199)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:350)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:436)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:214)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:114)
> >>> >>> TRACE 301479:
> >>> >>>        java.io.FileInputStream.readBytes(FileInputStream.java:Unknown
> >>> line)
> >>> >>>        java.io.FileInputStream.read(FileInputStream.java:199)
> >>> >>>        java.io.FilterInputStream.read(FilterInputStream.java:116)
> >>> >>>        java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> >>> >>>        java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
> >>> >>>        java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> >>> >>>        java.io.DataInputStream.readFully(DataInputStream.java:178)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:271)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:436)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:214)
> >>> >>>
> >>>  org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:114)
> >>> >>>
> >>> >>> Thanks
> >>> >>> Weihua
> >>> >>>
> >>> >>> 2011/4/28 Weihua JIANG :
> >>> >>>> I am using CDH3U0. It is HBase 0.90.1, I think.
> >>> >>>>
> >>> >>>> Thanks
> >>> >>>> Weihua
> >>> >>>>
> >>> >>>> 2011/4/28 Stack :
> >>> >>>>> On Tue, Apr 26, 2011 at 6:02 PM, Weihua JIANG <
> >>> weihua.jiang@gmail.com> wrote:
> >>> >>>>>> I tried to enable HPROF on RS, but failed. If I
added the HPROF
> >>> agent
> >>> >>>>>> in hbase-env.sh, RS startup reports an error said
HPROF can't be
> >>> >>>>>> loaded twice. But, I am sure I only enabled it
once. I don't know
> >>> >>>>>> where the problem is.
> >>> >>>>>>
> >>> >>>>>
> >>> >>>>> This sounds like 'HBASE-3561  OPTS arguments are duplicated'
 Are you
> >>> >>>>> running 0.90.2?
> >>> >>>>>
> >>> >>>>> St.Ack
> >>> >>>>>
> >>> >>>>
> >>> >>>
> >>> >>
> >>> >
> >>>
> >>
> >
 		 	   		  
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