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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8520) Patch for PPC64 block size
Date Tue, 25 Aug 2015 21:16:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14711995#comment-14711995
] 

Andrew Wang commented on HDFS-8520:
-----------------------------------

Hi Tony,

My point is that we don't really have PPC64 support right now, things like caching haven't
been tested on it AFAIK, and making tests use a variable rather than a hardcoded page size
doesn't change the supported status. It certainly wouldn't add support for unknown architectures
that have non-4096 and non-64KB page sizes. I proposed using a hardcoded 64KB to patch over
this one test in the meantime. I have no way of validating a change to use getOperatingSystemPageSize()
actually works on PPC64 since I don't have a PPC64 test environment where it would return
64KB. Thus the hardcode.

If there's some big push to add PPC64 support, validate it, and get it in the precommit pool,
then sure we can do it more generically.

> Patch for PPC64 block size
> --------------------------
>
>                 Key: HDFS-8520
>                 URL: https://issues.apache.org/jira/browse/HDFS-8520
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>         Environment: RHEL 7.1 /PPC64
>            Reporter: Tony Reix
>            Assignee: Tony Reix
>         Attachments: HDFS-8520-2.patch, HDFS-8520.patch
>
>
> The attached patch enables Hadoop to work on PPC64.
> That deals with SystemPageSize and BloclSize , which are not 4096 on PPC64.
> There are changes in 3 files:
> - hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java
> - hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java
> - hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCacheDirectives.java
> where 4096 is replaced by getOperatingSystemPageSize() or by using PAGE_SIZE
> The patch has been built on branch-2.7 .



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