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https://issues.apache.org/jira/browse/HADOOP-11505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15107572#comment-15107572
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Alan Burlison commented on HADOOP-11505:
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Yes, I think splitting the work up is a good idea.
I've done a little more digging and to do anything sophisticated with ant
inside a pom.xml is not possible, for example only running cmake if
CMakeFiles.txt has been modified. That's because you can only have one ant
<target> block within a maven-antrun-plugin section in the pom.xml. The
recommended approach is to to move any complicated ant logic into a separate
build.xml file and just call ant from maven. I think such a refactoring would
also make it easier to develop/test the native build parts in isolation from
the rest of the maven build. The one wrinkle in this case is the use of the
native-maven-plugin in the pom.xml to run javah on the classfiles and generate
the corresponding C headers. I've completely failed to find any documentation
for it so I've no idea if it is smart enough to only regenerate the .h when the
corresponding classfile is updated. However if the decision is to refactor the
JNI build into an ant build.xml then I think the javah parts should be moved
into ant as well.
> 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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