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https://issues.apache.org/jira/browse/HADOOP-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630495#action_12630495
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Devaraj Das commented on HADOOP-3638:
-------------------------------------
That makes sense. But should we be bothered about the degenerate case of having
to write index files on disk when the memory limit for the index files is
exhausted.
> 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: Jothi Padmanabhan
> Fix For: 0.19.0
>
> Attachments: hadoop-3638-v1.patch, hadoop-3638-v2.patch
>
>
> The iFile index files can be cached in memory to reduce seeks during map
> output serving.
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