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https://issues.apache.org/jira/browse/HDFS-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553195#comment-13553195
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Hadoop QA commented on HDFS-3429:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12564769/hdfs-3429.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 4 new
or modified test files.
{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:red}-1 release audit{color}. The applied patch generated 2
release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/3835//testReport/
Release audit warnings:
https://builds.apache.org/job/PreCommit-HDFS-Build/3835//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3835//console
This message is automatically generated.
> DataNode reads checksums even if client does not need them
> ----------------------------------------------------------
>
> Key: HDFS-3429
> URL: https://issues.apache.org/jira/browse/HDFS-3429
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, performance
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 3.0.0, 2.0.3-alpha
>
> Attachments: hdfs-3429-0.20.2.patch, hdfs-3429-0.20.2.patch,
> hdfs-3429.txt, hdfs-3429.txt, hdfs-3429.txt, hdfs-3429.txt
>
>
> Currently, even if the client does not want to verify checksums, the datanode
> reads them anyway and sends them over the wire. This means that performance
> improvements like HBase's application-level checksums don't have much benefit
> when reading through the datanode, since the DN is still causing seeks into
> the checksum file.
> (Credit goes to Dhruba for discovering this - filing on his behalf)
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