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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7210) Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append call from DFSClient
Date Thu, 09 Oct 2014 11:17:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14165003#comment-14165003
] 

Hadoop QA commented on HDFS-7210:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12673861/HDFS-7210-004.patch
  against trunk revision 2a51494.

    {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
2.0.3) warnings.

        {color:red}-1 release audit{color}.  The applied patch generated 1 release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication

                                      The following test timeouts occurred in hadoop-hdfs-project/hadoop-hdfs:

org.apache.hadoop.hdfs.TestCrcCorruption

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8374//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8374//artifact/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8374//console

This message is automatically generated.

> Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append call
from DFSClient
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7210
>                 URL: https://issues.apache.org/jira/browse/HDFS-7210
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client, namenode
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>         Attachments: HDFS-7210-001.patch, HDFS-7210-002.patch, HDFS-7210-003.patch, HDFS-7210-004.patch
>
>
> Currently DFSClient does 2 RPCs to namenode for an append operation.
> {{append()}} for re-opening the file and getting the last block, 
> {{getFileInfo()}} Another on to get HdfsFileState
> If we can combine result of these 2 calls and make one RPC, then it can reduce load on
NameNode.
> For the backward compatibility we need to keep existing {{append()}} call as is



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