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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3638) Cache the iFile index files in memory to reduce seeks during map output serving
Date Fri, 12 Sep 2008 05:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630489#action_12630489
] 

Arun C Murthy commented on HADOOP-3638:
---------------------------------------

In addition, it might make sense to just cache the indexes in memory on the map, we don't
need to write them to disk at all... a simple map from filename -> IndexTable should suffice.
We only need to write the final one to disk. Thoughts?

> 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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