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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-3167) Hadoop: restore external execution.
Date Thu, 29 Sep 2016 09:24:20 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15532280#comment-15532280

Taras Ledkov commented on IGNITE-3167:


> Hadoop: restore external execution.
> -----------------------------------
>                 Key: IGNITE-3167
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3167
>             Project: Ignite
>          Issue Type: Task
>          Components: hadoop
>    Affects Versions: 1.5.0.final
>            Reporter: Vladimir Ozerov
>            Assignee: Taras Ledkov
>            Priority: Critical
>              Labels: roadmap
>             Fix For: 1.8
> Some time ago we decided to get rid external execution mode. It appears to be a wrong
> Hadoop users rely on its process-per-job nature in lot's places. One of such case could
be observed in HiBench Bayes benchmark:
> 1) Job creates something in the local file system through Hadoop FileSystem API.
> 2) Then it tries to get this data using regular java.io.FileReader and relative paths.

> This doesn't work in embedded mode because our LocalFileSystem wrapper assigns different
work dirs for jobs, but process-wide working directory is always the same. As a result, aforementioned
benchmark doesn't work in Ignite, but work with standard Hadoop job tracker.
> It seems that we must return external execution back.

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