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https://issues.apache.org/jira/browse/HADOOP-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608115#action_12608115
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Owen O'Malley commented on HADOOP-3638:
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I'd suggest setting an upper bound on the size of the cache and treat it as LRU
cache.
> Cache the iFile index files in memory to reduce seeks during map output
> serving
> -------------------------------------------------------------------------------
>
> Key: HADOOP-3638
> URL: https://issues.apache.org/jira/browse/HADOOP-3638
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.17.0
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Fix For: 0.19.0
>
>
> The iFile index files can be cached in memory to reduce seeks during map
> output serving.
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