Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
MapReduce >> mail # user >> Re: Hadoop jobtracker OOME fix applied and no OOME but JT hanged


Copy link to this message
-
Re: Hadoop jobtracker OOME fix applied and no OOME but JT hanged
It's possible that you're seeing a different problem now.  I know of at
least one bug that can cause the JobTracker to hang for extensive periods
of time.  It's caused by holding a lock while writing user history to HDFS.
 MAPREDUCE-5606 tracks this bug, and it actually might be a duplicate of
MAPREDUCE-1144.

https://issues.apache.org/jira/browse/MAPREDUCE-5606

https://issues.apache.org/jira/browse/MAPREDUCE-1144

See MAPREDUCE-5606 for a full description of the symptoms.  If you run
jstack on your JobTracker process, and the thread dump looks similar, then
you'll be able to tell if this is the problem.  MAPREDUCE-5606 also
describes a workaround that you can apply in mapred-site.xml.

Chris Nauroth
Hortonworks
http://hortonworks.com/

On Fri, Nov 15, 2013 at 1:57 PM, Ted Yu <[EMAIL PROTECTED]> wrote:

> From the command line, can you run 'jmap -heap' ?
>
> http://download.oracle.com/javase/1.5.0/docs/tooldocs/share/jmap.html
>
>
> On Fri, Nov 15, 2013 at 10:50 AM, Viswanathan J <
> [EMAIL PROTECTED]> wrote:
>
>> Hi guys,
>>
>> I had JT OOME in hadoop version 1.2.1 and applied the patch based on the
>> fix given by Apache contributors for jira issue mapreduce-5508.
>>
>> After applying that fix the heap size gradually increases but after one
>> week jobtracker completely hangs and slowdown but didn't get JT OOME. No
>> error in JT logs.
>>
>> Without this fix weekly once JT heap size increases and got OOME.
>>
>> Please help its our production environment.
>>
>> Thanks,
>>
>
>

--
CONFIDENTIALITY NOTICE
NOTICE: This message is intended for the use of the individual or entity to
which it is addressed and may contain information that is confidential,
privileged and exempt from disclosure under applicable law. If the reader
of this message is not the intended recipient, you are hereby notified that
any printing, copying, dissemination, distribution, disclosure or
forwarding of this communication is strictly prohibited. If you have
received this communication in error, please contact the sender immediately
and delete it from your system. Thank You.