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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1965) Handle map output buffers better
Date Tue, 23 Oct 2007 09:19:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amar Kamat updated HADOOP-1965:
-------------------------------

    Attachment: 1965_single_proc_150mb_gziped.jpeg

Jpeg version of the pdf file attached earlier.

> Handle map output buffers better
> --------------------------------
>
>                 Key: HADOOP-1965
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1965
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Devaraj Das
>            Assignee: Amar Kamat
>         Attachments: 1965_single_proc_150mb_gziped.jpeg, 1965_single_proc_150mb_gziped.pdf,
1965_single_proc_150mb_gziped_breakup.png
>
>
> Today, the map task stops calling the map method while sort/spill is using the (single
instance of) map output buffer. One improvement that can be done to improve performance of
the map task is to have another buffer for writing the map outputs to, while sort/spill is
using the first buffer.

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