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https://issues.apache.org/jira/browse/HIVE-2035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052940#comment-13052940
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jirapos...@reviews.apache.org commented on HIVE-2035:
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Can you make sure that in the test cases, the query need the merge step?
- Siying
On 2011-06-20 19:20:53, Franklin Hu wrote:
bq.
bq. -----------------------------------------------------------
bq. This is an automatically generated e-mail. To reply, visit:
bq. https://reviews.apache.org/r/935/
bq. -----------------------------------------------------------
bq.
bq. (Updated 2011-06-20 19:20:53)
bq.
bq.
bq. Review request for hive.
bq.
bq.
bq. Summary
bq. -------
bq.
bq. For a table stored as RCFile, intermediate results are sometimes merged if
those files are below a certain threshold. For RCFiles, we can do a block level
merge that does not deserialize the blocks and is more efficient. This patch
leverages the existing code used to merge for ALTER TABLE ... CONCATENATE.
bq.
bq.
bq. This addresses bug HIVE-2035.
bq. https://issues.apache.org/jira/browse/HIVE-2035
bq.
bq.
bq. Diffs
bq. -----
bq.
bq. trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1136090
bq. trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/TaskFactory.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/BlockMergeTask.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/MergeWork.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/RCFileBlockMergeRecordReader.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/RCFileKeyBufferWrapper.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/RCFileMergeMapper.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRFileSink1.java
1136090
bq.
trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ConditionalResolverMergeFiles.java
1136090
bq. trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/MapredWork.java 1136090
bq. trunk/ql/src/test/queries/clientpositive/rcfile_createas1.q PRE-CREATION
bq. trunk/ql/src/test/queries/clientpositive/rcfile_merge1.q PRE-CREATION
bq. trunk/ql/src/test/queries/clientpositive/rcfile_merge2.q PRE-CREATION
bq. trunk/ql/src/test/queries/clientpositive/rcfile_merge3.q PRE-CREATION
bq. trunk/ql/src/test/queries/clientpositive/rcfile_merge4.q PRE-CREATION
bq. trunk/ql/src/test/results/clientpositive/rcfile_createas1.q.out
PRE-CREATION
bq. trunk/ql/src/test/results/clientpositive/rcfile_merge1.q.out
PRE-CREATION
bq. trunk/ql/src/test/results/clientpositive/rcfile_merge2.q.out
PRE-CREATION
bq. trunk/ql/src/test/results/clientpositive/rcfile_merge3.q.out
PRE-CREATION
bq. trunk/ql/src/test/results/clientpositive/rcfile_merge4.q.out
PRE-CREATION
bq.
bq. Diff: https://reviews.apache.org/r/935/diff
bq.
bq.
bq. Testing
bq. -------
bq.
bq.
bq. Thanks,
bq.
bq. Franklin
bq.
bq.
> Use block-level merge for RCFile if merging intermediate results are needed
> ---------------------------------------------------------------------------
>
> Key: HIVE-2035
> URL: https://issues.apache.org/jira/browse/HIVE-2035
> Project: Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: Franklin Hu
> Attachments: hive-2035.1.patch
>
>
> Currently if hive.merge.mapredfiles and/or hive.merge.mapfile is set to true
> the intermediate data could be merged using an additional MapReduce job. This
> could be quite expensive if the data size is large. With HIVE-1950, merging
> can be done in the RCFile block level so that it bypasses the
> (de-)compression, (de-)serialization phases. This could improve the merge
> process significantly.
> This JIRA should handle the case where the input table is not stored in
> RCFile, but the destination table is (which requires the intermediate data
> should be stored in the same format as the destination table).
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