GitHub user LuciferYang opened a pull request:
https://github.com/apache/spark/pull/23214
[SPARK-26155] Optimizing the performance of LongToUnsafeRowMap
## What changes were proposed in this pull request?
To slove @JkSelf report problem at
[SPARK-26155](https://issues.apache.org/jira/browse/SPARK-26155), use LongAdder
instead of Long of `numKeyLookups` and `numProbes` to reduce add operation
times. @JkSelf test this patch in Intel performance testing environment and
run TPCDS sqls after this patch with Spark-2.3 and master no longer slower than
Spark-2.1.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/LuciferYang/spark spark-26155
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23214.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #23214
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commit 34decea2f59d9fb3930f4d2ca1ad8a625d0409ea
Author: yangjie01 <yangjie01@...>
Date: 2018-12-04T05:49:19Z
use LongAdder instead of Long
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