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Posted to issues@hive.apache.org by "liyunzhang_intel (JIRA)" <ji...@apache.org> on 2017/06/06 06:48:18 UTC
[jira] [Updated] (HIVE-16600) Refactor
SetSparkReducerParallelism#needSetParallelism to enable parallel order by
in multi_insert cases
[ https://issues.apache.org/jira/browse/HIVE-16600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
liyunzhang_intel updated HIVE-16600:
------------------------------------
Attachment: HIVE-16600.10.patch
TestSetSparkReduceParallelism_MultiInsertCase.java
Node.java
> Refactor SetSparkReducerParallelism#needSetParallelism to enable parallel order by in multi_insert cases
> --------------------------------------------------------------------------------------------------------
>
> Key: HIVE-16600
> URL: https://issues.apache.org/jira/browse/HIVE-16600
> Project: Hive
> Issue Type: Sub-task
> Reporter: liyunzhang_intel
> Assignee: liyunzhang_intel
> Attachments: HIVE-16600.10.patch, HIVE-16600.1.patch, HIVE-16600.2.patch, HIVE-16600.3.patch, HIVE-16600.4.patch, HIVE-16600.5.patch, HIVE-16600.6.patch, HIVE-16600.7.patch, HIVE-16600.8.patch, HIVE-16600.9.patch, mr.explain, mr.explain.log.HIVE-16600, Node.java, TestSetSparkReduceParallelism_MultiInsertCase.java
>
>
> multi_insert_gby.case.q
> {code}
> set hive.exec.reducers.bytes.per.reducer=256;
> set hive.optimize.sampling.orderby=true;
> drop table if exists e1;
> drop table if exists e2;
> create table e1 (key string, value string);
> create table e2 (key string);
> FROM (select key, cast(key as double) as keyD, value from src order by key) a
> INSERT OVERWRITE TABLE e1
> SELECT key, value
> INSERT OVERWRITE TABLE e2
> SELECT key;
> select * from e1;
> select * from e2;
> {code}
> the parallelism of Sort is 1 even we enable parallel order by("hive.optimize.sampling.orderby" is set as "true"). This is not reasonable because the parallelism should be calcuated by [Utilities.estimateReducers|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/spark/SetSparkReducerParallelism.java#L170]
> this is because SetSparkReducerParallelism#needSetParallelism returns false when [children size of RS|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/spark/SetSparkReducerParallelism.java#L207] is greater than 1.
> in this case, the children size of {{RS[2]}} is two.
> the logical plan of the case
> {code}
> TS[0]-SEL[1]-RS[2]-SEL[3]-SEL[4]-FS[5]
> -SEL[6]-FS[7]
> {code}
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