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https://issues.apache.org/jira/browse/HADOOP-11505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109231#comment-15109231
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Colin Patrick McCabe commented on HADOOP-11505:
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Keep in mind we no longer use the antrun Maven plugin to run {{cmake}}... since
HADOOP-8887, we have a custom CMake plugin to do that. It runs {{cmake}} +
{{make}} every time (but this takes a very short amount of time on my machine).
We could potentially optimize it to check file timestamps, although this is
something that {{cmake}} itself also does.
I do not want to convert parts of the build to ant... it would be less
maintainable than what we have, especially for platforms like Windows where the
build environment is non-UNIX.
Before we start optimizing, I would like to see a breakdown of how much time
each step actually takes. Or at least a rough estimate. My gut feeling is
that the {{javah}} step could be worth optimizing, but I don't have any numbers
to justify that yet. Some of the other native builds have accumulated cruft
like file copies which I didn't have time fix. Above all, we should find out
which step(s) are leading to rebuilds on things that haven't changed.
> Various native parts use bswap incorrectly and unportably
> ---------------------------------------------------------
>
> Key: HADOOP-11505
> URL: https://issues.apache.org/jira/browse/HADOOP-11505
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Alan Burlison
> Fix For: 3.0.0
>
> Attachments: HADOOP-11505.001.patch, HADOOP-11505.003.patch,
> HADOOP-11505.004.patch, HADOOP-11505.005.patch, HADOOP-11505.006.patch,
> HADOOP-11505.007.patch
>
>
> hadoop-mapreduce-client-nativetask fails to use x86 optimizations in some
> cases. Also, on some alternate, non-x86, non-ARM architectures the generated
> code is incorrect. Thanks to Steve Loughran and Edward Nevill for finding
> this.
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