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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (IGNITE-3167) Hadoop: restore external execution.
Date Fri, 26 Aug 2016 12:14:20 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Taras Ledkov updated IGNITE-3167:
---------------------------------
    Comment: was deleted

(was: - *1, 2 ,5* - fixed;
- *3* - because external process doesn't contain ignite node. So, we have to use JdkMarshaller.
- *4* - {{Process.toString()}} contains real PID of process. It may be useful with debug cases.
I add {{childProcId}} to output.)

> 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
decision.
> 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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