Github user heary-cao commented on the issue:
https://github.com/apache/spark/pull/18182
@kiszk
thanks for review it.
use
```
./spark-sql --executor-memory 5G --total-executor-cores 5 --conf
spark.executor.cores=1
./spark-sql --executor-memory 5G --total-executor-cores 5 --conf
spark.executor.cores=1 --conf spark.shuffle.file.buffer=64k
./spark-sql --executor-memory 5G --total-executor-cores 5 --conf
spark.executor.cores=1 --conf spark.shuffle.file.buffer=1024k
./spark-sql --executor-memory 5G --total-executor-cores 5 --conf
spark.executor.cores=1 --conf spark.shuffle.file.buffer=4k
```
test change the size of the spark.shuffle.file.buffer,
Performance tuning results such as the description of PR.
thanks.
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