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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1965) Handle map output buffers better
Date Thu, 29 Nov 2007 05:48:43 GMT

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

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

    Status: Open  (was: Patch Available)

> Handle map output buffers better
> --------------------------------
>
>                 Key: HADOOP-1965
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1965
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Devaraj Das
>            Assignee: Amar Kamat
>             Fix For: 0.16.0
>
>         Attachments: 1965_single_proc_150mb_gziped.jpeg, 1965_single_proc_150mb_gziped.pdf,
1965_single_proc_150mb_gziped_breakup.png, HADOOP-1965-1.patch, HADOOP-1965-Benchmark.patch,
HADOOP-1965-Benchmark.patch, HADOOP-1965-Benchmark.patch, HADOOP-1965-Benchmark.patch
>
>
> 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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