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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2121) Input Sampling By Splits
Date Tue, 26 Apr 2011 21:22:03 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025438#comment-13025438
] 

jiraposter@reviews.apache.org commented on HIVE-2121:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/633/
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(Updated 2011-04-26 21:19:18.557345)


Review request for hive, Ning Zhang and namit jain.


Changes
-------

Addressing most of Ning's comments.


Summary
-------

We need a better input sampling to serve at least two purposes:
1. test their queries against a smaller data set
2. understand more about how the data look like without scanning the whole table.
A simple function that gives a subset splits will help in those cases. It doesn't have to
be strict sampling.

This diff allows a syntax of .. table TABLESAMPLE(n PERCENT), which samples input splits with
size at least n% of the original inputs.


This addresses bug HIVE-2121.
    https://issues.apache.org/jira/browse/HIVE-2121


Diffs (updated)
-----

  trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1096852 
  trunk/conf/hive-default.xml 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/io/CombineHiveInputFormat.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/io/HiveFileFormatUtils.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRFileSink1.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRTableScan1.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRUnion1.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/MapJoinFactory.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/ParseContext.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 1096852 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SplitSample.java PRE-CREATION 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/MapredWork.java 1096852 
  trunk/ql/src/test/queries/clientnegative/split_sample_disabled.q PRE-CREATION 
  trunk/ql/src/test/queries/clientnegative/split_sample_out_of_range.q PRE-CREATION 
  trunk/ql/src/test/queries/clientnegative/split_sample_wrong_format.q PRE-CREATION 
  trunk/ql/src/test/queries/clientpositive/split_sample.q PRE-CREATION 
  trunk/ql/src/test/results/clientnegative/split_sample_disabled.q.out PRE-CREATION 
  trunk/ql/src/test/results/clientnegative/split_sample_out_of_range.q.out PRE-CREATION 
  trunk/ql/src/test/results/clientnegative/split_sample_wrong_format.q.out PRE-CREATION 
  trunk/ql/src/test/results/clientpositive/bucket1.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/bucket2.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/bucket3.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/bucketmapjoin1.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample1.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample10.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample2.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample3.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample4.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample5.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample6.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample7.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample8.q.out 1096852 
  trunk/ql/src/test/results/clientpositive/sample9.q.out 1096852 

Diff: https://reviews.apache.org/r/633/diff


Testing
-------

TestCliDriver TestNegativeCliDriver, manual tests on real clusters.


Thanks,

Siying



> Input Sampling By Splits
> ------------------------
>
>                 Key: HIVE-2121
>                 URL: https://issues.apache.org/jira/browse/HIVE-2121
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>         Attachments: HIVE-2121.1.patch, HIVE-2121.2.patch, HIVE-2121.3.patch
>
>
> We need a better input sampling to serve at least two purposes:
> 1. test their queries against a smaller data set
> 2. understand more about how the data look like without scanning the whole table.
> A simple function that gives a subset splits will help in those cases. It doesn't have
to be strict sampling.

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