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From Keith Thompson <kthom...@binghamton.edu>
Subject Re: Reduce Hangs at 66%
Date Thu, 03 May 2012 23:33:49 GMT
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_segel@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 <kthomps6@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

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