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https://issues.apache.org/jira/browse/HDFS-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054267#comment-14054267
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Hadoop QA commented on HDFS-6599:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12654372/HDFS-6599.patch
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 2 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}. 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 1.3.9) 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-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/7286//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7286//console
This message is automatically generated.
> 2.4 addBlock is 10 to 20 times slower compared to 0.23
> ------------------------------------------------------
>
> Key: HDFS-6599
> URL: https://issues.apache.org/jira/browse/HDFS-6599
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0, 2.4.0
> Reporter: Kihwal Lee
> Assignee: Daryn Sharp
> Priority: Blocker
> Attachments: HDFS-6599.patch
>
>
> From one of our busiest 0.23 clusters:
> {panel}
> "AddBlockAvgTime" : 0.9514711501719515
> "CreateAvgTime" : 1.7564162389174
> "CompleteAvgTime" : 1.3310406035056548
> "BlockReceivedAndDeletedAvgTime" : 0.661210005151392
> {panel}
> From a not-so-busy 2.4 cluster:
> {panel}
> "AddBlockAvgTime" : 10.083333333333334
> "CreateAvgTime" : 1.0
> "CompleteAvgTime" : 1.1111111111111112
> "BlockReceivedAndDeletedAvgTime" : 0.07692307692307694
> {panel}
> When the 2.4 cluster gets a moderate amount of write requests, the latency is
> terrible. E.g. addBlock goes upward of 60ms.
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