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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2282) Local mode needs to work well with block sampling
Date Fri, 15 Jul 2011 02:18:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065682#comment-13065682
] 

jiraposter@reviews.apache.org commented on HIVE-2282:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1132/
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Review request for hive and Siying Dong.


Summary
-------

A query should run in local mode when block sampling is used and the sample is small enough.
 The size of the sample is currently being estimated, as it is done to estimate the number
of reducers.


This addresses bug HIVE-2282.
    https://issues.apache.org/jira/browse/HIVE-2282


Diffs
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  ql/src/test/queries/clientpositive/sample_islocalmode_hook.q PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/exec/MapRedTask.java 53769a0 
  ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java cd3de76 
  ql/src/test/org/apache/hadoop/hive/ql/hooks/VerifyIsLocalModeHook.java PRE-CREATION 

Diff: https://reviews.apache.org/r/1132/diff


Testing
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TestCliDriver TestNegativeCliDriver, manually tested


Thanks,

Kevin



> Local mode needs to work well with block sampling
> -------------------------------------------------
>
>                 Key: HIVE-2282
>                 URL: https://issues.apache.org/jira/browse/HIVE-2282
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Siying Dong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-2282.1.patch.txt
>
>
> Currently, if block sampling is enabled and large set of data are sampled to a small
set, local mode needs to be kicked in. 

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