Keith What is the the output for ulimit -n? Your value for number of open files is probably too low.
Raj >________________________________ > From: Keith Thompson <kthom...@binghamton.edu> >To: common-user@hadoop.apache.org >Sent: Thursday, May 3, 2012 4:33 PM >Subject: Re: Reduce Hangs at 66% > >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 > > >
