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From "Subramaniam Krishnan (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HADOOP-3387) Custom Splitter for handling many small files
Date Thu, 15 May 2008 06:29:55 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Subramaniam Krishnan reopened HADOOP-3387:
------------------------------------------


> Custom Splitter for handling many small files
> ---------------------------------------------
>
>                 Key: HADOOP-3387
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3387
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Subramaniam Krishnan
>            Assignee: Subramaniam Krishnan
>             Fix For: 0.18.0
>
>
> Hadoop by default allocates a Map to a file irrespective of size. This is not optimal
if you have a large number of small files, for e.g:- If you 2000 100KB files, 2000 Maps will
be allocated for the job.
> The Custom Multi File Splitter collapses all the small files to a single split till the
DFS Block Size is hit. 
> It also take care of handling big files by splitting them on Block Size and adding up
all the reminders(if any) to a further splits of Block Size. 

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