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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4927) Part files on the output filesystem are created irrespective of whether the corresponding task has anything to write there
Date Sun, 01 Feb 2009 03:31:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669328#action_12669328
] 

Jothi Padmanabhan commented on HADOOP-4927:
-------------------------------------------

True, this feature can be achieved by modifying RecordWriter implementations. But that would
mean people who have their own implementations would need to add it themselves, see Devaraj's
[comment|https://issues.apache.org/jira/browse/HADOOP-4927?focusedCommentId=12658455#action_12658455]
Also, this feature is a sort of generic across the different output formats and having the
framework support this would be useful. No?

> Part files on the output filesystem are created irrespective of whether the corresponding
task has anything to write there
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4927
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4927
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Devaraj Das
>            Assignee: Jothi Padmanabhan
>             Fix For: 0.21.0
>
>         Attachments: hadoop-4927-v1.patch, hadoop-4927-v2.patch, hadoop-4927.patch
>
>
> When OutputFormat.getRecordWriter is invoked, a part file is created on the output filesystem.
But the created RecordWriter is not used until the OutputCollector.collect call is made by
the task (user's code). This results in empty part files even if the OutputCollector.collect
is never invoked by the corresponding tasks.

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