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https://issues.apache.org/jira/browse/MAPREDUCE-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039167#comment-13039167
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Hudson commented on MAPREDUCE-2494:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk #690 (See
[https://builds.apache.org/hudson/job/Hadoop-Mapreduce-trunk/690/])
MAPREDUCE-2494. Order distributed cache deletions by LRU.
Contributed by Robert Joseph Evans
cdouglas :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1127386
Files :
*
/hadoop/mapreduce/trunk/src/java/org/apache/hadoop/mapreduce/filecache/TrackerDistributedCacheManager.java
* /hadoop/mapreduce/trunk/CHANGES.txt
*
/hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapreduce/filecache/TestTrackerDistributedCacheManager.java
*
/hadoop/mapreduce/trunk/src/java/org/apache/hadoop/mapreduce/server/tasktracker/TTConfig.java
> Make the distributed cache delete entires using LRU priority
> ------------------------------------------------------------
>
> Key: MAPREDUCE-2494
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2494
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: distributed-cache
> Affects Versions: 0.21.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2494-V1.patch, MAPREDUCE-2494-V2.patch
>
>
> Currently the distributed cache will wait until a cache directory is above a
> preconfigured threshold. At which point it will delete all entries that are
> not currently being used. It seems like we would get far fewer cache misses
> if we kept some of them around, even when they are not being used. We should
> add in a configurable percentage for a goal of how much of the cache should
> remain clear when not in use, and select objects to delete based off of how
> recently they were used, and possibly also how large they are/how difficult
> is it to download them again.
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