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https://issues.apache.org/jira/browse/HADOOP-11466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286245#comment-14286245
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Hadoop QA commented on HADOOP-11466:
------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12693678/HADOOP-11466.003.patch
against trunk revision 925c9fe.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-common-project/hadoop-common.
Test results:
https://builds.apache.org/job/PreCommit-HADOOP-Build/5444//testReport/
Console output:
https://builds.apache.org/job/PreCommit-HADOOP-Build/5444//console
This message is automatically generated.
> FastByteComparisons: do not use UNSAFE_COMPARER on the SPARC architecture
> because it is slower there
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-11466
> URL: https://issues.apache.org/jira/browse/HADOOP-11466
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io, performance, util
> Environment: Linux X86 and Solaris SPARC
> Reporter: Suman Somasundar
> Assignee: Suman Somasundar
> Priority: Minor
> Labels: patch
> Attachments: HADOOP-11466.002.patch, HADOOP-11466.003.patch
>
>
> One difference between Hadoop 2.x and Hadoop 1.x is a utility to compare two
> byte arrays at coarser 8-byte granularity instead of at the byte-level. The
> discussion at HADOOP-7761 says this fast byte comparison is somewhat faster
> for longer arrays and somewhat slower for smaller arrays ( AVRO-939). In
> order to do 8-byte reads on addresses not aligned to 8-byte boundaries, the
> patch uses Unsafe.getLong. The problem is that this call is incredibly
> expensive on SPARC. The reason is that the Studio compiler detects an
> unaligned pointer read and handles this read in software. x86 supports
> unaligned reads, so there is no penalty for this call on x86.
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