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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12926) lz4.c does not detect 64-bit mode properly
Date Thu, 17 Mar 2016 23:03:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15200581#comment-15200581
] 

Chris Nauroth commented on HADOOP-12926:
----------------------------------------

bq. I don't have any objection to this, but I suspect it will get overwritten next time someone
bumps the lz4 version.

Yes, possibly, if we bump to a version different from r131.  My reading of the r131 source
is that 64-bit detection is entirely different there, and it fixes this problem as a side
effect.  Since HADOOP-12572 plans to go to r131, I think the risk of regressing this patch
is small.  If something urgent like a security fix prompts us to upgrade to a later version,
but not r131, and it does not have the reworked 64-bit detection, then the risk is there.

bq. It's possible that we're misusing the API and that's why the new version doesn't work
for us...

Agreed.  My instinct is that it's more likely the bugs seen in HADOOP-12572 are in the Hadoop
code rather than the LZ4 code.

+1.  I plan to commit this, but I'll wait until Friday, 3/18, in case anyone else wants to
comment.

> lz4.c does not detect 64-bit mode properly
> ------------------------------------------
>
>                 Key: HADOOP-12926
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12926
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: native
>    Affects Versions: 2.7.2
>         Environment: All
>            Reporter: Alan Burlison
>            Assignee: Alan Burlison
>         Attachments: HADOOP-12926.001.patch
>
>
> lz4.c should check to see if the _LP64 macro is defined to correctly detect when it is
being built in 64-bit mode.



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