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 <weihua.ji...@gmail.com>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 <st...@duboce.net>: > > 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 <jdcry...@apache.org> > wrote: > >> Seems to be a case of HDFS-347. > >> > >> J-D > >> > >> On Thu, Apr 28, 2011 at 12:55 AM, Weihua JIANG <weihua.ji...@gmail.com> > 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 <weihua.ji...@gmail.com>: > >>>> I am using CDH3U0. It is HBase 0.90.1, I think. > >>>> > >>>> Thanks > >>>> Weihua > >>>> > >>>> 2011/4/28 Stack <st...@duboce.net>: > >>>>> On Tue, Apr 26, 2011 at 6:02 PM, Weihua JIANG < > weihua.ji...@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 > >>>>> > >>>> > >>> > >> > > >
