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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1570) Add a per-job configuration knob to control loading of native hadoop libraries
Date Wed, 11 Jul 2007 19:05:04 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated HADOOP-1570:
---------------------------------

    Status: Open  (was: Patch Available)

This looks great, except the methods to set the configuration property don't belong on JobConf.
 JobConf should only have methods specific to jobs, settings read by the MapReduce kernel.
 We've not been great about enforcing this in the past, but don't want JobConf to just turn
into a heap of settings.  Rather these should be static methods on related code, like util.NativeCodeLoader.

> Add a per-job configuration knob to control loading of native hadoop libraries 
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-1570
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1570
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: io
>    Affects Versions: 0.13.0, 0.12.3
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.14.0
>
>         Attachments: HADOOP-1570_1_20070709.patch
>
>
> As it exists today, native-hadoop libraries are loaded automatically if libhadoop.so
is present; however we have sporadically seen issues (HADOOP-1545) since native direct-buffers
aren't very well understood. The only way to switch off usage of these is to remove the native
libraries which is a maintenence issue for large clusters...
> Hence I propose we add a per-job config knob: {{hadoop.native.lib}} (set to {{true}}
by default) which can be used to control usage of native libraries even when the libraries
are present e.g. we can have hadoop installed with native libraries present and then use this
knob to switch off their usage in rare cases we see issues with them; thus aiding maintenence.

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