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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3638) Cache the iFile index files in memory to reduce seeks during map output serving
Date Thu, 11 Sep 2008 11:43:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jothi Padmanabhan updated HADOOP-3638:
--------------------------------------

    Attachment: hadoop-3638-v2.patch

Incorporating Sharad's offline comments
1. Introduce a writeLong in IFileOutputStream instead of layering it over FSDataoutputStream
2. Clean up the getIndexInformation method
3. Use a separate external comparator method for the LRU instead of implementing it inside
IndexInformation
4. Remove the redundant indexIn variable in TaskTracker

> 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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