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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6141) History server leveldb recovery store
Date Tue, 27 Jan 2015 14:31:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293601#comment-14293601
] 

Hudson commented on MAPREDUCE-6141:
-----------------------------------

SUCCESS: Integrated in Hadoop-Hdfs-trunk #2018 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/2018/])
MAPREDUCE-6141. History server leveldb recovery store. Contributed by Jason Lowe (jlowe: rev
56b7ec71a69820ae12b4b9e2eb04b7368f721dbf)
* hadoop-mapreduce-project/CHANGES.txt
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/HistoryServerLeveldbStateStoreService.java
* 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-core/src/main/resources/mapred-default.xml
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestHistoryServerLeveldbStateStoreService.java
* hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/pom.xml


> History server leveldb recovery store
> -------------------------------------
>
>                 Key: MAPREDUCE-6141
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6141
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>             Fix For: 2.7.0
>
>         Attachments: MAPREDUCE-6141.patch, MAPREDUCE-6141v2.patch, MAPREDUCE-6141v2.patch
>
>
> It would be nice to have a leveldb option to the job history server recovery store. 
Leveldb would provide some benefits over the existing filesystem store such as better support
for atomic operations, fewer I/O ops per state update, and far fewer total files on the filesystem.



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