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https://issues.apache.org/jira/browse/HIVE-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718674#comment-13718674
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Edward Capriolo commented on HIVE-4885:
---------------------------------------
I appreciate your effort, supporting Java 07 is important but we have to
properly understand the work that is needed. We are currently in the process of
supporting hadoop 2, windows, etc. The problem with these type of efforts is I
am never sure when they start or when they are done. Maybe we should open an
umbrella issue. I will give xstream a try tonight.
> 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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