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https://issues.apache.org/jira/browse/HDFS-3529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485777#comment-13485777
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Hadoop QA commented on HDFS-3529:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12551137/HDFS-3529.patch
against trunk revision .
{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}. The javadoc tool did not generate any
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 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs:
org.apache.hadoop.fs.loadGenerator.TestLoadGenerator
org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/3412//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3412//console
This message is automatically generated.
> Use direct buffers for data in write path
> -----------------------------------------
>
> Key: HDFS-3529
> URL: https://issues.apache.org/jira/browse/HDFS-3529
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, performance
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: Trevor Robinson
> Attachments: HDFS-3529.patch
>
>
> The write path currently makes several unnecessary data copies in order to go
> to and from byte arrays. We can improve performance by using direct byte
> buffers to avoid the copy. This is also a prerequisite for native checksum
> calculation (HDFS-3528)
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