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From "Jimmy Xiang" <jxi...@cloudera.com>
Subject Re: Review Request 30739: HIVE-9574 Lazy computing in HiveBaseFunctionResultList may hurt performance [Spark Branch]
Date Mon, 09 Feb 2015 19:01:14 GMT


> On Feb. 9, 2015, 3:17 a.m., Rui Li wrote:
> > ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveKVResultCache.java, line 102
> > <https://reviews.apache.org/r/30739/diff/4/?file=853475#file853475line102>
> >
> >     What happens if input!=null and we're creating the temp file again?

Right. We use a new temp file since the old one is still in use.


- Jimmy


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/30739/#review71604
-----------------------------------------------------------


On Feb. 7, 2015, 3:09 a.m., Jimmy Xiang wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/30739/
> -----------------------------------------------------------
> 
> (Updated Feb. 7, 2015, 3:09 a.m.)
> 
> 
> Review request for hive, Rui Li and Xuefu Zhang.
> 
> 
> Bugs: HIVE-9574
>     https://issues.apache.org/jira/browse/HIVE-9574
> 
> 
> Repository: hive-git
> 
> 
> Description
> -------
> 
> Result KV cache doesn't use RowContainer any more since it has logic we don't need, which
is some overhead. We don't do lazy computing right away, instead we wait a little till the
cache is close to spill.
> 
> 
> Diffs
> -----
> 
>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveBaseFunctionResultList.java 78ab680

>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveKVResultCache.java 8ead0cb 
>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveMapFunction.java 7a09b4d 
>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveMapFunctionResultList.java e92e299

>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveReduceFunction.java 070ea4d 
>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveReduceFunctionResultList.java
d4ff37c 
>   ql/src/java/org/apache/hadoop/hive/ql/exec/spark/KryoSerializer.java 286816b 
>   ql/src/test/org/apache/hadoop/hive/ql/exec/spark/TestHiveKVResultCache.java 0df4598

> 
> Diff: https://reviews.apache.org/r/30739/diff/
> 
> 
> Testing
> -------
> 
> Unit test, test on cluster
> 
> 
> Thanks,
> 
> Jimmy Xiang
> 
>


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