No. The key is generated randomly. In theory, it shall distributed to all the RSs equally.
Thanks Weihua 2011/5/17 Ted Dunning <[email protected]>: > 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 <[email protected]>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 <[email protected]>: >> > 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 <[email protected]> >> wrote: >> >> Seems to be a case of HDFS-347. >> >> >> >> J-D >> >> >> >> On Thu, Apr 28, 2011 at 12:55 AM, Weihua JIANG <[email protected]> >> 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 <[email protected]>: >> >>>> I am using CDH3U0. It is HBase 0.90.1, I think. >> >>>> >> >>>> Thanks >> >>>> Weihua >> >>>> >> >>>> 2011/4/28 Stack <[email protected]>: >> >>>>> On Tue, Apr 26, 2011 at 6:02 PM, Weihua JIANG < >> [email protected]> 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 >> >>>>> >> >>>> >> >>> >> >> >> > >> >
