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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4822) Unnecessary conversions in History Events
Date Tue, 05 Feb 2013 07:36:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571122#comment-13571122
] 

Hadoop QA commented on MAPREDUCE-4822:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12567961/MAPREDUCE-4822.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {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-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3302//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3302//console

This message is automatically generated.
                
> Unnecessary conversions in History Events
> -----------------------------------------
>
>                 Key: MAPREDUCE-4822
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4822
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver
>    Affects Versions: 0.23.4
>            Reporter: Robert Joseph Evans
>            Assignee: Chu Tong
>            Priority: Trivial
>              Labels: patch
>             Fix For: 0.24.0
>
>         Attachments: MAPREDUCE-4822.patch
>
>
> There are a number of conversions in the Job History Event classes that are totally unnecessary.
 It appears that they were originally used to convert from the internal avro format, but now
many of them do not pull the values from the avro they store them internally.
> For example:
> {code:title=TaskAttemptFinishedEvent.java}
>   /** Get the task type */
>   public TaskType getTaskType() {
>     return TaskType.valueOf(taskType.toString());
>   }
> {code}
> The code currently is taking an enum, converting it to a string and then asking the same
enum to convert it back to an enum.  If java work properly this should be a noop and a reference
to the original taskType should be returned.
> There are several places that a string is having toString called on it, and since strings
are immutable it returns a reference to itself.
> The various ids are not immutable and probably should not be changed at this point.

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