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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1583) Improve backup-node sync performance by wrapping RPC parameters
Date Fri, 25 Feb 2011 01:28:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999177#comment-12999177
] 

Hadoop QA commented on HDFS-1583:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12468458/test-rpc.diff
  against trunk revision 1074282.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 9 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    -1 release audit.  The applied patch generated 3 release audit warnings (more than the
trunk's current 0 warnings).

    -1 core tests.  The patch failed these core unit tests:
                  org.apache.hadoop.hdfs.server.balancer.TestBalancer
                  org.apache.hadoop.hdfs.server.datanode.TestBlockReport
                  org.apache.hadoop.hdfs.TestFileConcurrentReader

    -1 contrib tests.  The patch failed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/212//testReport/
Release audit warnings: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/212//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/212//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/212//console

This message is automatically generated.

> Improve backup-node sync performance by wrapping RPC parameters
> ---------------------------------------------------------------
>
>                 Key: HDFS-1583
>                 URL: https://issues.apache.org/jira/browse/HDFS-1583
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Liyin Liang
>            Assignee: Liyin Liang
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1583-1.patch, HDFS-1583-2.patch, test-rpc.diff
>
>
> The journal edit records are sent by the active name-node to the backup-node with RPC:
> {code:}
>   public void journal(NamenodeRegistration registration,
>                       int jAction,
>                       int length,
>                       byte[] records) throws IOException;
> {code}
> During the name-node throughput benchmark, the size of byte array _records_ is around
*8000*.  Then the serialization and deserialization is time-consuming. I wrote a simple application
to test RPC with byte array parameter. When the size got to 8000, each RPC call need about
6 ms. While name-node sync 8k byte to local disk only need  0.3~0.4ms.

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