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https://issues.apache.org/jira/browse/HIVE-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022277#comment-13022277
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jirapos...@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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Review request for hive, Ning Zhang and namit jain.
Summary
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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
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trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1095244
trunk/conf/hive-default.xml 1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/CombineHiveInputFormat.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/HiveFileFormatUtils.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRFileSink1.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRTableScan1.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRUnion1.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/MapJoinFactory.java
1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/Hive.g 1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/ParseContext.java 1095244
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
1095244
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 1095244
trunk/ql/src/test/queries/clientnegative/split_sample_disabled.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_wrong_format.q.out
PRE-CREATION
trunk/ql/src/test/results/clientpositive/bucket1.q.out 1095244
trunk/ql/src/test/results/clientpositive/bucket2.q.out 1095244
trunk/ql/src/test/results/clientpositive/bucket3.q.out 1095244
trunk/ql/src/test/results/clientpositive/bucketmapjoin1.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample1.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample10.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample2.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample3.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample4.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample5.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample6.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample7.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample8.q.out 1095244
trunk/ql/src/test/results/clientpositive/sample9.q.out 1095244
Diff: https://reviews.apache.org/r/633/diff
Testing
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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
>
>
> 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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