>Caused by: java.io.IOException: Could not obtain block: blk_-3695352030358969086_130839 file=/user/emeij/icwsm-data-test/01-26-?>SOCIAL_MEDIA.tar.gz > at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1977)
a question for you: Does the exception always complain about "blk_-3695352030358969086_130839" ? if so, you can try to find this block in your data node's local dir, just make sure it does exist... On Thu, Mar 10, 2011 at 3:09 AM, Evert Lammerts <evert.lamme...@sara.nl>wrote: > I didn't mention it but the complete filesystem is reported healthy by > fsck. I'm guessing that the java.io.EOFException indicates a problem caused > by the load of the job. > > Any ideas? > > ________________________________________ > From: Marcos Ortiz [mlor...@uci.cu] > Sent: Wednesday, March 09, 2011 4:31 PM > To: mapreduce-u...@hadoop.apache.org > Cc: Evert Lammerts; 'hdfs-user@hadoop.apache.org'; cdh-u...@cloudera.org > Subject: Re: Could not obtain block > > El 3/9/2011 6:27 AM, Evert Lammerts escribió: > > We see a lot of IOExceptions coming from HDFS during a job that does > nothing but untar 100 files (1 per Mapper, sizes vary between 5GB and 80GB) > that are in HDFS, to HDFS. DataNodes are also showing Exceptions that I > think are related. (See stacktraces below.) > > > > This job should not be able to overload the system I think... I realize > that much data needs to go over the lines, but HDFS should still be > responsive. Any ideas / help is much appreciated! > > > > Some details: > > * Hadoop 0.20.2 (CDH3b4) > > * 5 node cluster plus 1 node for JT/NN (Sun Thumpers) > > * 4 cores/node, 4GB RAM/core > > * CentOS 5.5 > > > > Job output: > > > > java.io.IOException: java.io.IOException: Could not obtain block: > blk_-3695352030358969086_130839 > file=/user/emeij/icwsm-data-test/01-26-SOCIAL_MEDIA.tar.gz > > > Which is the ouput of: > bin/hadoop dfsadmin -report > > Which is the output of: > bin/hadoop fsck /user/emeij/icwsm-data-test/ > > at ilps.DownloadICWSM$UntarMapper.map(DownloadICWSM.java:449) > > at ilps.DownloadICWSM$UntarMapper.map(DownloadICWSM.java:1) > > at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50) > > at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:390) > > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:324) > > at org.apache.hadoop.mapred.Child$4.run(Child.java:240) > > at java.security.AccessController.doPrivileged(Native Method) > > at javax.security.auth.Subject.doAs(Subject.java:396) > > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115) > > at org.apache.hadoop.mapred.Child.main(Child.java:234) > > Caused by: java.io.IOException: Could not obtain block: > blk_-3695352030358969086_130839 > file=/user/emeij/icwsm-data-test/01-26-SOCIAL_MEDIA.tar.gz > > > Which is the ouput of: > bin/hadoop fsck /user/emeij/icwsm-data-test/01-26-SOCIAL_MEDIA.tar.gz > --files -blocks -racks > > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1977) > > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1784) > > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1932) > > at java.io.DataInputStream.read(DataInputStream.java:83) > > at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:55) > > at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:74) > > at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:335) > > at ilps.DownloadICWSM$CopyThread.run(DownloadICWSM.java:149) > > > > > > Example DataNode Exceptions (not that these come from the node at > 192.168.28.211): > > > > 2011-03-08 19:40:40,297 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in receiveBlock > for block blk_-9222067946733189014_3798233 java.io.EOFException: while > trying to read 3067064 bytes > > 2011-03-08 19:40:41,018 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode.clienttrace: src: / > 192.168.28.211:50050, dest: /192.168.28.211:49748, bytes: 0, op: > HDFS_READ, cliID: DFSClient_attempt_201103071120_0030_m_000032_0, offset: 30 > > 72, srvID: DS-568746059-145.100.2.180-50050-1291128670510, blockid: > blk_3596618013242149887_4060598, duration: 2632000 > > 2011-03-08 19:40:41,049 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in receiveBlock > for block blk_-9221028436071074510_2325937 java.io.EOFException: while > trying to read 2206400 bytes > > 2011-03-08 19:40:41,348 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in receiveBlock > for block blk_-9221549395563181322_4024529 java.io.EOFException: while > trying to read 3037288 bytes > > 2011-03-08 19:40:41,357 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in receiveBlock > for block blk_-9221885906633018147_3895876 java.io.EOFException: while > trying to read 1981952 bytes > > 2011-03-08 19:40:41,434 WARN > org.apache.hadoop.hdfs.server.datanode.DataNode: Block > blk_-9221885906633018147_3895876 unfinalized and removed. > > 2011-03-08 19:40:41,434 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: writeBlock > blk_-9221885906633018147_3895876 received exception java.io.EOFException: > while trying to read 1981952 bytes > > 2011-03-08 19:40:41,434 ERROR > org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration( > 192.168.28.211:50050, > storageID=DS-568746059-145.100.2.180-50050-1291128670510, infoPort=50075, > ipcPort=50020):DataXceiver > > java.io.EOFException: while trying to read 1981952 bytes > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readToBuf(BlockReceiver.java:270) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readNextPacket(BlockReceiver.java:357) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:378) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:534) > > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:417) > > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:122) > > 2011-03-08 19:40:41,465 WARN > org.apache.hadoop.hdfs.server.datanode.DataNode: Block > blk_-9221549395563181322_4024529 unfinalized and removed. > > 2011-03-08 19:40:41,466 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: writeBlock > blk_-9221549395563181322_4024529 received exception java.io.EOFException: > while trying to read 3037288 bytes > > 2011-03-08 19:40:41,466 ERROR > org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration( > 192.168.28.211:50050, > storageID=DS-568746059-145.100.2.180-50050-1291128670510, infoPort=50075, > ipcPort=50020):DataXceiver > > java.io.EOFException: while trying to read 3037288 bytes > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readToBuf(BlockReceiver.java:270) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readNextPacket(BlockReceiver.java:357) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:378) > > at > org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:534) > > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:417) > > at > org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:122) > > > > Cheers, > > > > Evert Lammerts > > Consultant eScience& Cloud Services > > SARA Computing& Network Services > > Operations, Support& Development > > > > Phone: +31 20 888 4101 > > Email: evert.lamme...@sara.nl > > http://www.sara.nl > > > > > > > > Then on the DataNode where you have the particular block > (blk_-3695352030358969086_130839 ) > you can visit the web interface > http://192.168.28.211:50075/blockScannerReport to see what's happening > on the node > > Regards > > -- > Marcos Luís Ortíz Valmaseda > Software Engineer > Universidad de las Ciencias Informáticas > Linux User # 418229 > > http://uncubanitolinuxero.blogspot.com > http://www.linkedin.com/in/marcosluis2186 > >
