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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4885) Alternative object serialization for execution plan in hive testing
Date Wed, 24 Jul 2013 18:13:49 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718649#comment-13718649
] 

Edward Capriolo commented on HIVE-4885:
---------------------------------------

Here is an idea. Why don't we just look for another XML encoded/ decoder and use that instead
of the java one. 
                
> Alternative object serialization for execution plan in hive testing 
> --------------------------------------------------------------------
>
>                 Key: HIVE-4885
>                 URL: https://issues.apache.org/jira/browse/HIVE-4885
>             Project: Hive
>          Issue Type: Improvement
>          Components: CLI
>    Affects Versions: 0.10.0, 0.11.0
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>             Fix For: 0.12.0
>
>         Attachments: HIVE-4885.patch
>
>
> Currently there are a lot of test cases involving in comparing execution plan, such as
those in TestParse suite. XmlEncoder is used to serialize the generated plan by hive, and
store it in the file for file diff comparison. However, XmlEncoder is tied with Java compiler,
whose implementation may change from version to version. Thus, upgrade the compiler can generate
a lot of fake test failures. The following is an example of diff generated when running hive
with JDK7:
> {code}
> Begin query: case_sensitivity.q
> diff -a /data/4/hive-local/a2307.halxg.cloudera.com-hiveptest-2/cdh-source/build/ql/test/logs/positive/case_sensitivity.q.out
/data/4/hive-local/a2307.halxg.cloudera.com-hiveptest-2/cdh-source/ql/src/test/results/compiler/parse/case_sensitivity.q.out
> diff -a -b /data/4/hive-local/a2307.halxg.cloudera.com-hiveptest-2/cdh-source/build/ql/test/logs/positive/case_sensitivity.q.xml
/data/4/hive-local/a2307.halxg.cloudera.com-hiveptest-2/cdh-source/ql/src/test/results/compiler/plan/case_sensitivity.q.xml
> 3c3
> <  <object class="org.apache.hadoop.hive.ql.exec.MapRedTask" id="MapRedTask0">
> ---
> >  <object id="MapRedTask0" class="org.apache.hadoop.hive.ql.exec.MapRedTask">

> 12c12
> <        <object class="java.util.ArrayList" id="ArrayList0">
> ---
> >        <object id="ArrayList0" class="java.util.ArrayList"> 
> 14c14
> <          <object class="org.apache.hadoop.hive.ql.exec.MoveTask" id="MoveTask0">
> ---
> >          <object id="MoveTask0" class="org.apache.hadoop.hive.ql.exec.MoveTask">

> 18c18
> <              <object class="org.apache.hadoop.hive.ql.exec.MoveTask" id="MoveTask1">
> ---
> >              <object id="MoveTask1" class="org.apache.hadoop.hive.ql.exec.MoveTask">

> 22c22
> <                  <object class="org.apache.hadoop.hive.ql.exec.StatsTask" id="StatsTask0">
> ---
> >                  <object id="StatsTask0" class="org.apache.hadoop.hive.ql.exec.StatsTask">

> 60c60
> <                  <object class="org.apache.hadoop.hive.ql.exec.MapRedTask" id="MapRedTask1">
> ---
> >                  <object id="MapRedTask1" class="org.apache.hadoop.hive.ql.exec.MapRedTask">

> {code}
> As it can be seen, the only difference is the order of the attributes in the serialized
XML doc, yet it brings 50+ test failures in Hive.
> We need to have a better plan comparison, or object serialization to improve the situation.

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