Github user caneGuy commented on the issue:
https://github.com/apache/spark/pull/19168
Sorry for replying so late.
I add some benchmark testing for this pr @kiszk .
And @jerryshao could you help review this pr?Thanks
```
Running benchmark: Benchmark fetch before vs after releasing buffer
Running case: Testing fetch before releasing!
Stopped after 10 iterations, 2423 ms
Running case: Testing fetch after releasing!
Stopped after 18 iterations, 2036 ms
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux 4.4.0-64-generic
Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
Benchmark fetch before vs after releasing buffer: Best/Avg Time(ms)
Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
Testing fetch before releasing! 46 / 242 345.0
2.9 1.0X
Testing fetch after releasing! 73 / 113 215.7
4.6 0.6X
```
```
Running benchmark: Benchmark fetch before vs after releasing buffer
Running case: Testing fetch before releasing!
Stopped after 10 iterations, 3888 ms
Running case: Testing fetch after releasing!
Stopped after 10 iterations, 3970 ms
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux 4.4.0-64-generic
Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
Benchmark fetch before vs after releasing buffer: Best/Avg Time(ms)
Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
Testing fetch before releasing! 100 / 389 157.8
6.3 1.0X
Testing fetch after releasing! 151 / 397 104.3
9.6 0.7X
```
```
Running benchmark: Benchmark fetch before vs after releasing buffer
Running case: Testing fetch before releasing!
Stopped after 15 iterations, 2016 ms
Running case: Testing fetch after releasing!
Stopped after 14 iterations, 2110 ms
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux 4.4.0-64-generic
Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
Benchmark fetch before vs after releasing buffer: Best/Avg Time(ms)
Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
Testing fetch before releasing! 43 / 134 363.8
2.7 1.0X
Testing fetch after releasing! 99 / 151 158.1
6.3 0.4X
```
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