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Date: Thu, 21 Nov 2013 06:53:38 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12671594.1380639484342.6261.1385016818936@arcas>
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References: <JIRA.12671594.1380639484342@arcas>
Subject: [jira] [Commented] (HDFS-5285) Flatten INodeFile hierarchy: Add
 UnderContruction Feature
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    [ https://issues.apache.org/jira/browse/HDFS-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828550#comment-13828550 ] 

Hadoop QA commented on HDFS-5285:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12615061/HDFS-5285.002.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 8 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: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/5517//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5517//console

This message is automatically generated.

> Flatten INodeFile hierarchy: Add UnderContruction Feature
> ---------------------------------------------------------
>
>                 Key: HDFS-5285
>                 URL: https://issues.apache.org/jira/browse/HDFS-5285
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Jing Zhao
>         Attachments: HDFS-5285.001.patch, HDFS-5285.002.patch, h5285_20131001.patch, h5285_20131002.patch, h5285_20131118.patch
>
>
> For files, there are INodeFile, INodeFileUnderConstruction, INodeFileWithSnapshot and INodeFileUnderConstructionWithSnapshot for representing whether a file is under construction or whether it is in some snapshot.  The following are two major problems of the current approach:
> - Java class does not support multiple inheritances so that INodeFileUnderConstructionWithSnapshot cannot extend both INodeFileUnderConstruction and INodeFileWithSnapshot.
> - The number of classes is exponential to the number of features.  Currently, there are only two features, UnderConstruction and WithSnapshot.  The number of classes is 2^2 = 4.  It is hard to add one more feature since the number of classes will become 2^3 = 8.
> As a first step, we implement an Under-Construction feature to replace INodeFileUnderConstruction and INodeFileUnderConstructionWithSnapshot in this jira.


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