Unfortunately I cannot find mapred.chils.opts in this version:
<property>
<name>mapreduce.map.java.opts</name>
<value>-Xmx1024m -XX:-UseGCOverheadLimit</value>
<description>Heap-size for child jvms of maps.</description>
</property>
I’m assuming this is the blighter. Is there a way to measure from the dataset
and the query at what size I need to set this limit?
Much Appreciated,
Gary C
From: Edward Capriolo [mailto:[email protected]]
Sent: Wednesday, December 30, 2015 9:08 AM
To: [email protected]
Subject: Re: Seeing strange limit
In the old days mapred.chils.opts was the one. Knowing the query and the
dataset helps as well.
On Wednesday, December 30, 2015, Gary Clark
<[email protected]<mailto:[email protected]>> wrote:
<value>-Xmx1024m -XX:-UseGCOverheadLimit</value>
I think this is the limit I need to tweak.
From: Gary Clark
[mailto:[email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>]
Sent: Wednesday, December 30, 2015 8:59 AM
To: [email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>
Subject: RE: Seeing strange limit
Thanks, currently have the below:
export HADOOP_PORTMAP_OPTS="-Xmx512m $HADOOP_PORTMAP_OPTS"
# The following applies to multiple commands (fs, dfs, fsck, distcp etc)
export HADOOP_CLIENT_OPTS="-Xmx512m $HADOOP_CLIENT_OPTS"
and HADOOP_HEAPSIZE=4096
I’m assuming just raising the above would work.
Much Appreciated,
Gary C
From: Edward Capriolo
[mailto:[email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>]
Sent: Wednesday, December 30, 2015 8:55 AM
To: [email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>
Subject: Re: Seeing strange limit
This message means the garbage collector runs but is unable to free memory
after trying for a while.
This can happen for a lot of reasons. With hive it usually happens when a query
has a lot of intermediate data.
For example imaging a few months ago count (distinct(ip)) returned 20k.
Everything works, then your data changes and suddenly you have issues.
Try tuning mostly raising your xmx.
On Wednesday, December 30, 2015, Gary Clark
<[email protected]<javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
Hello,
I have a multi-node cluster (hadoop 2.6.0) and am seeing the below message
causing the hive workflow to fail:
Looking at the hadoop logs I see the below:
45417 [main] ERROR org.apache.hadoop.hive.ql.Driver - FAILED: Execution Error,
return code -101 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask. GC overhead
limit exceeded
I have been running for months without problems. When I removed a large amount
of the files from the directory which I was running a query on the query
succeeded. It looks like I’m hitting a limit not sure how to remedy this.
Has anybody else seen this problem?
Thanks,
Gary C
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