[jira] Commented: (HIVE-518) test mode in hive

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

    [ https://issues.apache.org/jira/browse/HIVE-518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713342#action_12713342 ] 

Zheng Shao commented on HIVE-518:
---------------------------------

1. Can you add comment for SemanticAnalyzer.genSamplePredicate? Especially for the new planExpr parameter. It's not clear what this parameter means.

2. Can you add comments on what we will do in case hive is running in test mode and table is bucketed?

+<property>
+  <name>hive.test.mode.samplefreq</name>
+  <value>32</value>
+  <description>if hive is running in test mode and table is not bucketed, sampling frequency</description>
+</property>


> test mode in hive
> -----------------
>
>                 Key: HIVE-518
>                 URL: https://issues.apache.org/jira/browse/HIVE-518
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.3.1
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>             Fix For: 0.4.0
>
>         Attachments: hive.518.1.patch
>
>
> It would be good to have a test mode in hive - this will help in checking the validity of a hive drop on a production cluster.
> The following would be good to have:
> Testmode --> In testmode, all input tables are sampled (if not already sampled) and all output tables are prefixed by a user supplied name.
> This way, multiple hive drops can be compared quickly for correctness

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