I am not sure about ulimits, but I can answer the rest. It's a Cloudera distribution of Hadoop 0.20.2. The HDFS has 9 TB free. In the reduce step, I am taking keys in the form of (gridID, date), each with a value of 1. The reduce step just sums the 1's as the final output value for the key (It's counting how many people were in the gridID on a certain day).
I have been running other more complicated jobs with no problem, so I'm not sure why this one is being peculiar. This is the code I used to execute the program from the command line (the source is a file on the hdfs): hadoop jar <jarfile> <driver> <source> /thompson/outputDensity/density1 The program then executes the map and gets to 66% of the reduce, then stops responding. The cause of the error seems to be: Error from attempt_201202240659_6432_r_000000_1: java.io.IOException: > The temporary job-output directory > hdfs://analytix1:9000/thompson/outputDensity/density1/_temporary > doesn't exist! I don't understand what the _temporary is. I am assuming it's something Hadoop creates automatically. On Thu, May 3, 2012 at 5:02 AM, Michel Segel <michael_se...@hotmail.com>wrote: > Well... > Lots of information but still missing some of the basics... > > Which release and version? > What are your ulimits set to? > How much free disk space do you have? > What are you attempting to do? > > Stuff like that. > > > > Sent from a remote device. Please excuse any typos... > > Mike Segel > > On May 2, 2012, at 4:49 PM, Keith Thompson <kthom...@binghamton.edu> > wrote: > > > I am running a task which gets to 66% of the Reduce step and then hangs > > indefinitely. Here is the log file (I apologize if I am putting too much > > here but I am not exactly sure what is relevant): > > > > 2012-05-02 16:42:52,975 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (REDUCE) 'attempt_201202240659_6433_r_000000_0' to tip > > task_201202240659_6433_r_000000, for tracker > > 'tracker_analytix7:localhost.localdomain/127.0.0.1:56515' > > 2012-05-02 16:42:53,584 INFO org.apache.hadoop.mapred.JobInProgress: > > Task 'attempt_201202240659_6433_m_000001_0' has completed > > task_201202240659_6433_m_000001 successfully. > > 2012-05-02 17:00:47,546 INFO org.apache.hadoop.mapred.TaskInProgress: > > Error from attempt_201202240659_6432_r_000000_0: Task > > attempt_201202240659_6432_r_000000_0 failed to report status for 1800 > > seconds. Killing! > > 2012-05-02 17:00:47,546 INFO org.apache.hadoop.mapred.JobTracker: > > Removing task 'attempt_201202240659_6432_r_000000_0' > > 2012-05-02 17:00:47,546 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (TASK_CLEANUP) 'attempt_201202240659_6432_r_000000_0' to > > tip task_201202240659_6432_r_000000, for tracker > > 'tracker_analytix4:localhost.localdomain/127.0.0.1:44204' > > 2012-05-02 17:00:48,763 INFO org.apache.hadoop.mapred.JobTracker: > > Removing task 'attempt_201202240659_6432_r_000000_0' > > 2012-05-02 17:00:48,957 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (REDUCE) 'attempt_201202240659_6432_r_000000_1' to tip > > task_201202240659_6432_r_000000, for tracker > > 'tracker_analytix5:localhost.localdomain/127.0.0.1:59117' > > 2012-05-02 17:00:56,559 INFO org.apache.hadoop.mapred.TaskInProgress: > > Error from attempt_201202240659_6432_r_000000_1: java.io.IOException: > > The temporary job-output directory > > hdfs://analytix1:9000/thompson/outputDensity/density1/_temporary > > doesn't exist! > > at > org.apache.hadoop.mapred.FileOutputCommitter.getWorkPath(FileOutputCommitter.java:250) > > at > org.apache.hadoop.mapred.FileOutputFormat.getTaskOutputPath(FileOutputFormat.java:240) > > at > org.apache.hadoop.mapred.TextOutputFormat.getRecordWriter(TextOutputFormat.java:116) > > at > org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:438) > > at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416) > > at org.apache.hadoop.mapred.Child$4.run(Child.java:268) > > 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:262) > > > > 2012-05-02 17:00:59,903 INFO org.apache.hadoop.mapred.JobTracker: > > Removing task 'attempt_201202240659_6432_r_000000_1' > > 2012-05-02 17:00:59,906 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (REDUCE) 'attempt_201202240659_6432_r_000000_2' to tip > > task_201202240659_6432_r_000000, for tracker > > 'tracker_analytix3:localhost.localdomain/127.0.0.1:39980' > > 2012-05-02 17:01:07,200 INFO org.apache.hadoop.mapred.TaskInProgress: > > Error from attempt_201202240659_6432_r_000000_2: java.io.IOException: > > The temporary job-output directory > > hdfs://analytix1:9000/thompson/outputDensity/density1/_temporary > > doesn't exist! > > at > org.apache.hadoop.mapred.FileOutputCommitter.getWorkPath(FileOutputCommitter.java:250) > > at > org.apache.hadoop.mapred.FileOutputFormat.getTaskOutputPath(FileOutputFormat.java:240) > > at > org.apache.hadoop.mapred.TextOutputFormat.getRecordWriter(TextOutputFormat.java:116) > > at > org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:438) > > at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416) > > at org.apache.hadoop.mapred.Child$4.run(Child.java:268) > > 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:262) > > > > 2012-05-02 17:01:10,239 INFO org.apache.hadoop.mapred.JobTracker: > > Removing task 'attempt_201202240659_6432_r_000000_2' > > 2012-05-02 17:01:10,283 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (REDUCE) 'attempt_201202240659_6432_r_000000_3' to tip > > task_201202240659_6432_r_000000, for tracker > > 'tracker_analytix2:localhost.localdomain/127.0.0.1:33297' > > 2012-05-02 17:01:18,188 INFO org.apache.hadoop.mapred.TaskInProgress: > > Error from attempt_201202240659_6432_r_000000_3: java.io.IOException: > > The temporary job-output directory > > hdfs://analytix1:9000/thompson/outputDensity/density1/_temporary > > doesn't exist! > > at > org.apache.hadoop.mapred.FileOutputCommitter.getWorkPath(FileOutputCommitter.java:250) > > at > org.apache.hadoop.mapred.FileOutputFormat.getTaskOutputPath(FileOutputFormat.java:240) > > at > org.apache.hadoop.mapred.TextOutputFormat.getRecordWriter(TextOutputFormat.java:116) > > at > org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:438) > > at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416) > > at org.apache.hadoop.mapred.Child$4.run(Child.java:268) > > at java.security.AccessController.doPrivileged(Native Method) > > at javax.security.auth.Subject.doAs(Subject.java:396) > > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115) > > at org.apache.hadoop.mapred.Child.main(Child.java:262) > > > > 2012-05-02 17:01:21,228 INFO org.apache.hadoop.mapred.TaskInProgress: > > TaskInProgress task_201202240659_6432_r_000000 has failed 4 times. > > 2012-05-02 17:01:21,228 INFO org.apache.hadoop.mapred.JobInProgress: > > Aborting job job_201202240659_6432 > > 2012-05-02 17:01:21,228 INFO org.apache.hadoop.mapred.JobInProgress: > > Killing job 'job_201202240659_6432' > > 2012-05-02 17:01:21,228 INFO org.apache.hadoop.mapred.JobTracker: > > Adding task (JOB_CLEANUP) 'attempt_201202240659_6432_m_000002_0' to > > tip task_201202240659_6432_m_000002, for tracker > > 'tracker_analytix2:localhost.localdomain/127.0.0.1:33297' > > 2012-05-02 17:01:21,228 INFO org.apache.hadoop.mapred.JobTracker: > > Removing task 'attempt_201202240659_6432_r_000000_3' > > 2012-05-02 17:01:22,443 INFO org.apache.hadoop.mapred.JobInProgress: > > Task 'attempt_201202240659_6432_m_000002_0' has completed > > task_201202240659_6432_m_000002 successfully. > > 2012-05-02 17:01:22,443 INFO > > org.apache.hadoop.mapred.JobInProgress$JobSummary: > > > jobId=job_201202240659_6432,submitTime=1335990629637,launchTime=1335990629702,firstMapTaskLaunchTime=1335990631252,firstReduceTaskLaunchTime=1335990633988,firstJobSetupTaskLaunchTime=1335990629727,firstJobCleanupTaskLaunchTime=1335992481228,finishTime=1335992482443,numMaps=2,numSlotsPerMap=1,numReduces=1,numSlotsPerReduce=1,user=thompson,queue=default,status=FAILED,mapSlotSeconds=7,reduceSlotsSeconds=32,clusterMapCapacity=138,clusterReduceCapacity=138 > > 2012-05-02 17:01:22,446 WARN org.apache.hadoop.hdfs.DFSClient: > > DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: > > org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease > > on > /thompson/outputDensity/density1/_logs/history/analytix1_1330084785363_job_201202240659_6432_thompson_TwitterDensity > > File does not exist. Holder DFSClient_1931891231 does not have any > > open files. > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1542) > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1533) > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1449) > > at > org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:649) > > at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source) > > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > > at java.lang.reflect.Method.invoke(Method.java:597) > > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557) > > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1415) > > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1411) > > at java.security.AccessController.doPrivileged(Native Method) > > at javax.security.auth.Subject.doAs(Subject.java:396) > > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115) > > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1409) > > > > at org.apache.hadoop.ipc.Client.call(Client.java:1104) > > at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:226) > > at $Proxy4.addBlock(Unknown Source) > > at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source) > > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > > at java.lang.reflect.Method.invoke(Method.java:597) > > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) > > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59) > > at $Proxy4.addBlock(Unknown Source) > > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3185) > > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3055) > > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$1900(DFSClient.java:2305) > > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2500) > > > > 2012-05-02 17:01:22,446 WARN org.apache.hadoop.hdfs.DFSClient: Error > > Recovery for block null bad datanode[0] nodes == null > > 2012-05-02 17:01:22,446 WARN org.apache.hadoop.hdfs.DFSClient: Could > > not get block locations. Source file > > > "/thompson/outputDensity/density1/_logs/history/analytix1_1330084785363_job_201202240659_6432_thompson_TwitterDensity" > > - Aborting... > > 2012-05-02 17:01:22,446 INFO org.apache.hadoop.mapred.JobHistory: > > Moving > file:/var/log/hadoop/history/analytix1_1330084785363_job_201202240659_6432_thompson_TwitterDensity > > to file:/var/log/hadoop/history/done > > 2012-05-02 17:01:22,447 ERROR org.apache.hadoop.hdfs.DFSClient: > > Exception closing file > > > /thompson/outputDensity/density1/_logs/history/analytix1_1330084785363_job_201202240659_6432_thompson_TwitterDensity > > : org.apache.hadoop.ipc.RemoteException: > > org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease > > on > /thompson/outputDensity/density1/_logs/history/analytix1_1330084785363_job_201202240659_6432_thompson_TwitterDensity > > File does not exist. Holder DFSClient_1931891231 does not have any > > open files. > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1542) > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1533) > > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1449) > > at > org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:649) > > at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source) > > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > > at java.lang.reflect.Method.invoke(Method.java:597) > > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557) > > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1415) > > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1411) > > at java.security.AccessController.doPrivileged(Native Method) > > at javax.security.auth.Subject.doAs(Subject.java:396) > > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115) > > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1409) > > > > > > Can anyone explain to me what is causing the problem? > > > > -- > > *Keith Thompson* > -- *Keith Thompson* Graduate Research Associate, Xerox Corporation SUNY Research Foundation Dept. of Systems Science and Industrial Engineering Binghamton University Binghamton, NY 13902
