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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8642) io.native.lib.available only controls zlib
Date Sat, 14 Feb 2015 00:57:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14321077#comment-14321077
] 

Akira AJISAKA commented on HADOOP-8642:
---------------------------------------

bq. If we were to push this change to those existing clusters, then they'd suddenly lose the
rest of that important native code.
I agree with you. I'll update the patch to update the description in core-default.xml. Thanks
[~cnauroth] for the deeper review!

> io.native.lib.available only controls zlib
> ------------------------------------------
>
>                 Key: HADOOP-8642
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8642
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Akira AJISAKA
>         Attachments: HADOOP-8642.2.patch, HADOOP-8642.3.patch, HADOOP-8642.4.patch, HADOOP-8642.patch
>
>
> Per core-default.xml {{io.native.lib.available}} indicates "Should native hadoop libraries,
if present, be used" however it looks like it only affects zlib. Since we always load the
native library this means we may use native libraries even if io.native.lib.available is set
to false.
> Let's make the flag to work as advertised - rather than always load the native hadoop
library we only attempt to load the library (and report that native is available) if this
flag is set. Since io.native.lib.available defaults to true the default behavior should remain
unchanged (except that now we wont actually try to load the library if this flag is disabled).



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