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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8642) Document that io.native.lib.available only controls native bz2 and zlib compression codecs
Date Tue, 24 Feb 2015 01:32:13 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akira AJISAKA updated HADOOP-8642:
----------------------------------
    Description: Per core-default.xml {{io.native.lib.available}} indicates "Should native
hadoop libraries, if present, be used" however it looks like it only affects bzip2 and zlib.
Even if we set {{io.native.lib.available}} to false, native libraries are loaded and the libraries
other than bzip2 and zlib are actually used. We should document that.  (was: 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).)
     Issue Type: Improvement  (was: Bug)
        Summary: Document that io.native.lib.available only controls native bz2 and zlib compression
codecs  (was: Document that io.native.lib.available only controls native bz2 and zlib compression
codecs.)

> Document that io.native.lib.available only controls native bz2 and zlib compression codecs
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8642
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8642
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation, 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-8642.5.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 bzip2 and zlib. Even if we set
{{io.native.lib.available}} to false, native libraries are loaded and the libraries other
than bzip2 and zlib are actually used. We should document that.



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