[
https://issues.apache.org/jira/browse/MAPREDUCE-6622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15170289#comment-15170289
]
Hudson commented on MAPREDUCE-6622:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9380 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9380/])
MAPREDUCE-6622. Add capability to set JHS job cache to a task-based (rkanter:
rev 0f72da7e281376f4fcbfbf3fb33f5d7fedcdb1aa)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JHAdminConfig.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobHistory.java
* hadoop-mapreduce-project/CHANGES.txt
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/CachedHistoryStorage.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
> Add capability to set JHS job cache to a task-based limit
> ---------------------------------------------------------
>
> Key: MAPREDUCE-6622
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6622
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobhistoryserver
> Affects Versions: 2.7.2
> Reporter: Ray Chiang
> Assignee: Ray Chiang
> Labels: supportability
> Fix For: 2.9.0
>
> Attachments: MAPREDUCE-6622.001.patch, MAPREDUCE-6622.002.patch,
> MAPREDUCE-6622.003.patch, MAPREDUCE-6622.004.patch, MAPREDUCE-6622.005.patch,
> MAPREDUCE-6622.006.patch, MAPREDUCE-6622.007.patch, MAPREDUCE-6622.008.patch,
> MAPREDUCE-6622.009.patch, MAPREDUCE-6622.010.patch, MAPREDUCE-6622.011.patch,
> MAPREDUCE-6622.012.patch, MAPREDUCE-6622.013.patch, MAPREDUCE-6622.014.patch
>
>
> When setting the property mapreduce.jobhistory.loadedjobs.cache.size the jobs
> can be of varying size. This is generally not a problem when the jobs sizes
> are uniform or small, but when the job sizes can be very large (say greater
> than 250k tasks), then the JHS heap size can grow tremendously.
> In cases, where multiple jobs are very large, then the JHS can lock up and
> spend all its time in GC. However, since the cache is holding on to all the
> jobs, not much heap space can be freed up.
> By setting a property that sets a cap on the number of tasks allowed in the
> cache and since the total number of tasks loaded is directly proportional to
> the amount of heap used, this should help prevent the JHS from locking up.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
