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