Ted Yu wrote:
From Raj earlier:
I have seen this error from time to time and it has been either due to space
or
missing directories or disk errors.
Space issue was caused by the fact that the I had mounted /de/sdc on
/hadoop-dsk
and the mount had failed. And in another case I had
accidentally deleted hadoop.tmp.dir in a node and whenever the reduce job
was
scheduled on that node that attempt would fail.
On Wed, Dec 8, 2010 at 8:21 PM, Adarsh Sharma <[email protected]>wrote:
Raj V wrote:
Go through the jobtracker, find the relevant node that handled
attempt_201012061426_0001_m_000292_0 and figure out
if there are FS or permssion problems.
Raj
________________________________
From: Adarsh Sharma <[email protected]>
To: [email protected]
Sent: Wed, December 8, 2010 7:48:47 PM
Subject: Re: Reduce Error
Ted Yu wrote:
Any chance mapred.local.dir is under /tmp and part of it got cleaned up ?
On Wed, Dec 8, 2010 at 4:17 AM, Adarsh Sharma <[email protected]
wrote:
Dear all,
Did anyone encounter the below error while running job in Hadoop. It
occurs
in the reduce phase of the job.
attempt_201012061426_0001_m_000292_0:
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find
any
valid local directory for
taskTracker/jobcache/job_201012061426_0001/attempt_201012061426_0001_m_000292_0/output/file.out
t
It states that it is not able to locate a file that is created in
mapred.local.dir of Hadoop.
Thanks in Advance for any sort of information regarding this.
Best Regards
Adarsh Sharma
Hi Ted,
My mapred.local.dir is in /home/hadoop directory. I also check it with in
/hdd2-2 directory where we have lots of space.
Would mapred.map.tasks affects.
I checked with default and also with 80 maps and 16 reduces as I have 8
slaves.
<property>
<name>mapred.local.dir</name>
<value>/home/hadoop/mapred/local</value>
<description>The local directory where MapReduce stores intermediate
data files. May be a comma-separated list of directories on different
devices in order to spread disk i/o.
Directories that do not exist are ignored.
</description>
</property>
<property>
<name>mapred.system.dir</name>
<value>/home/hadoop/mapred/system</value>
<description>The shared directory where MapReduce stores control files.
</description>
</property>
Any further information u want.
Thanks & Regards
Adarsh Sharma
Sir I read the tasktracker logs several times but not able to find any
reason as they are not very useful. I attached with the mail of tasktracker.
However I listed main portion.
2010-12-06 15:27:04,228 INFO org.apache.hadoop.mapred.JobTracker: Adding
task 'attempt_201012061426_0001_m_000000_1' to tip
task_201012061426_0001_m_000000, for tracker 'tracker_ws37-user-lin:
127.0.0.1/127.0.0.1:60583'
2010-12-06 15:27:04,228 INFO org.apache.hadoop.mapred.JobInProgress:
Choosing rack-local task task_201012061426_0001_m_000000
2010-12-06 15:27:04,229 INFO org.apache.hadoop.mapred.JobTracker: Removed
completed task 'attempt_201012061426_0001_m_000000_0' from
'tracker_ws37-user-lin:127.0.0.1/127.0.0.1:60583'
2010-12-06 15:27:07,235 INFO org.apache.hadoop.mapred.TaskInProgress: Error
from attempt_201012061426_0001_m_000328_0: java.io.IOException: Spill failed
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:860)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:541)
at
org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
at
org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:30)
at
org.apache.hadoop.examples.WordCount$TokenizerMapper.map(WordCount.java:19)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:621)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not
find any valid local directory for
taskTracker/jobcache/job_201012061426_0001/attempt_201012061426_0001_m_000328_0/output/spill16.out
at
org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:343)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:124)
at
org.apache.hadoop.mapred.MapOutputFile.getSpillFileForWrite(MapOutputFile.java:107)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1221)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.access$1800(MapTask.java:686)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer$SpillThread.run(MapTask.java:1173)
2010-12-06 15:27:07,236 INFO org.apache.hadoop.mapred.TaskInProgress: Error
from attempt_201012061426_0001_m_000000_1: Error initializing
attempt_201012061426_0001_m_000000_1:
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find any
valid local directory for taskTracker/jobcache/job_201012061426_0001/job.xml
at
org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:343)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:124)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:750)
at
org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:1664)
at org.apache.hadoop.mapred.TaskTracker.access$1200(TaskTracker.java:97)
at
org.apache.hadoop.mapred.TaskTracker$TaskLauncher.run(TaskTracker.java:1629)
Thanks & Regards
Adarsh Sharma
Thanks to all for your replies but I fix this issue by setting the below
property to /hdd-1/tmp
This error occurs due to less space in mapred.child.tmp directory.
<property>
<name>mapred.child.tmp</name>
<value>./tmp</value>
<description> To set the value of tmp directory for map and reduce tasks.
If the value is an absolute path, it is directly assigned. Otherwise,
it is
prepended with task's working directory. The java tasks are executed with
option -Djava.io.tmpdir='the absolute path of the tmp dir'. Pipes and
streaming are set with environment variable,
TMPDIR='the absolute path of the tmp dir'
</description>
</property>
With Best Regards
Adarsh Sharma
