[jira] [Commented] (HIVE-3707) Round map/reduce progress down when it is in the range [99.5, 100)

["Hudson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-3707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547882#comment-13547882 ] 

Hudson commented on HIVE-3707:
------------------------------

Integrated in Hive-trunk-hadoop2 #54 (See [https://builds.apache.org/job/Hive-trunk-hadoop2/54/])
    HIVE-3707 Round map/reduce progress down when it is in the range [99.5, 100)
(Kevin Wilfong via namit) (Revision 1409680)

     Result = ABORTED
namit : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1409680
Files : 
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/HadoopJobExecHelper.java

                
> Round map/reduce progress down when it is in the range [99.5, 100)
> ------------------------------------------------------------------
>
>                 Key: HIVE-3707
>                 URL: https://issues.apache.org/jira/browse/HIVE-3707
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logging, Query Processor
>    Affects Versions: 0.10.0
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>            Priority: Minor
>             Fix For: 0.10.0
>
>         Attachments: HIVE-3707.1.patch.txt
>
>
> In HadoopJobExecHelper the mapProgress and reduceProgress are the value of these counters taken from the running job rounded to an integer percentage.  This means that e.g. if the mappers are 99.5% done this is stored as 100%.
> One of the most common questions I see from new users is, the map and reduce both report being 100% done, why is the query still running?
> By rounding down the value in this interval so it's only 100% when it's really 100% we could avoid that confusion.
> Also, the way it appears the QueryPlan and MapRedTask determine if the map/reduce phases are done is by checking if this value == 100.  I couldn't find anywhere where they're used for anything significant, but they're reporting early completion.

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