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https://issues.apache.org/jira/browse/MAPREDUCE-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Joseph Evans updated MAPREDUCE-2494:
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Status: Open (was: Patch Available)
In a different conversation with Chris he mentioned that sleeps in the tests
are bad, and that if they have to be there then they should be tied together
with some constant values. I am reworking the tests to deal with constant
values.
> 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
> Attachments: MAPREDUCE-2494-V1.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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