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Posted to issues@hbase.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2014/07/11 20:14:05 UTC
[jira] [Commented] (HBASE-11492) Hadoop configuration overrides
some ipc parameters including tcpNoDelay
[ https://issues.apache.org/jira/browse/HBASE-11492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059129#comment-14059129 ]
Hadoop QA commented on HBASE-11492:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12655252/11492.v2.patch
against trunk revision .
ATTACHMENT ID: 12655252
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 3 new or modified tests.
{color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings.
{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:red}-1 findbugs{color}. The patch appears to introduce 4 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 lineLengths{color}. The patch does not introduce lines longer than 100
{color:green}+1 site{color}. The mvn site goal succeeds with this patch.
{color:red}-1 core tests{color}. The patch failed these unit tests:
org.apache.hadoop.hbase.io.hfile.TestCacheConfig
Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/10035//console
This message is automatically generated.
> Hadoop configuration overrides some ipc parameters including tcpNoDelay
> -----------------------------------------------------------------------
>
> Key: HBASE-11492
> URL: https://issues.apache.org/jira/browse/HBASE-11492
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.98.0, 0.99.0
> Reporter: Nicolas Liochon
> Assignee: Nicolas Liochon
> Priority: Critical
> Fix For: 0.99.0, 0.98.5
>
> Attachments: 11492.v1.patch, 11492.v1.withp1.patch, 11492.v2.patch
>
>
> There is an option to set tcpNoDelay, defaulted to true, but the socket channel is actually not changed. As a consequence, the server works with nagle enabled. This leads to very degraded behavior when a single connection is shared between threads. We enter into conflicts with nagle and tcp delayed ack.
> Here is an example of performance with the PE tool plus HBASE-11491:
> {noformat}
> oneCon #client sleep exeTime (seconds) avg latency, sleep excluded (microseconds)
> true 1 0 31 310
> false 1 0 31 310
> true 2 0 50 500
> false 2 0 31 310
> true 2 5 488 (including 200s sleeping) 2880
> false 2 5 246 (including 200s sleeping) 460
> {noformat}
> The latency is multiple by 5 (2880 vs 460) when the connection is shared. This is the delayed ack kicking in. This can be fixed by really using tcp no delay.
> Any application sharing the tcp connection between threads has the issue.
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