hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2494) Make the distributed cache delete entires using LRU priority
Date Fri, 13 May 2011 15:52:47 GMT
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


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.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message