Are there more blocks on these hot DNs than there are on the cool ones? If you run a major compaction and then run your tests, does it make a difference? St.Ack
On Tue, May 17, 2011 at 8:03 PM, Weihua JIANG <[email protected]> wrote: > -ROOT- and .META. table are not served by these hot region servers. > > I generate the key in random and verified at client by grepping .META. > table and record the mapping from each query to its serving region > server. It shows that each RS serves almost the same number of query > requests. > > For GC hints, can you give me a link? I only found Todd's posts about > GC tuning for write. But, in my case, I only perform query. So, the > one I found seems no help to me. > > Thanks > Weihua > > 2011/5/17 Michael Segel <[email protected]>: >> >> 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$BlockReader >> to read data from DN. >> ' >> What speed disks are you using and how many disks per node? >> (you could be blocked on disk i/o.) >> >> >> -Mike >> >> >> ---------------------------------------- >>> Date: Tue, 17 May 2011 07:33:34 -0700 >>> Subject: Re: How to speedup Hbase query throughput >>> From: [email protected] >>> To: [email protected] >>> >>> Nice analysis. >>> >>> Can you figure the most popular blocks requested? You could figure >>> which files they belong too by grepping the blocks in namenode log. >>> >>> It is odd that you have the sort of a request profile if your loading >>> was even. I'd expect the DN distribution to be even. >>> >>> Sounds like hdfs-347 would help for sure. >>> >>> St.Ack >>> >>> >>> On Tue, May 17, 2011 at 6:57 AM, Weihua JIANG wrote: >>> > No. The key is generated randomly. In theory, it shall distributed to >>> > all the RSs equally. >>> > >>> > Thanks >>> > Weihua >>> > >>> > 2011/5/17 Ted Dunning : >>> >> Are your keys arranged so that you have a problem with a hot region? >>> >> >>> >> On Mon, May 16, 2011 at 11:18 PM, Weihua JIANG wrote: >>> >> >>> >>> I have not applied hdfs-347, but done some other experiments. >>> >>> >>> >>> I increased client thread to 2000 to put enough pressure on cluster. I >>> >>> disabled RS block cache. The total TPS is still low (with Month+User >>> >>> as row key, it is about 1300 for 10 RS+DN and with User+Month it is >>> >>> 700). >>> >>> >>> >>> I used BTrace to log the time spent on each HTable.get on RS. It shows >>> >>> that most of the GETs use 20~50ms and there are many GETs need >>> >>> >1000ms. And almost all these times are spent on DFSClient$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 < >>> >>> [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 >>> >>> >>>>> >>> >>> >>>> >>> >>> >>> >>> >>> >> >>> >>> > >>> >>> >>> >> >>> > >> >
