richardstartin opened a new pull request #7622:
URL: https://github.com/apache/pinot/pull/7622
## Description
Speed up `ByteArray.hashCode` which speeds up building column statistics.
Unfortunately the algorithm needs to be maintained in case it has been used for
partitioning, but it can be sped up easily by breaking a data dependency in the
loop.
```java
@State(Scope.Benchmark)
public class BenchmarkByteArray {
@Param({"7", "127", "1023"})
int _size;
ByteArray _bytes;
@Setup(Level.Trial)
public void init() {
byte[] bytes = new byte[_size];
ThreadLocalRandom.current().nextBytes(bytes);
_bytes = new ByteArray(bytes);
}
@Benchmark
public int byteArrayHashCode() {
return _bytes.hashCode();
}
@Benchmark
public int arraysHashCode() {
return Arrays.hashCode(_bytes.getBytes());
}
}
```
```
Benchmark (_size) Mode Cnt Score Error
Units
BenchmarkByteArray.arraysHashCode 7 avgt 5 6.823 ± 3.155
ns/op
BenchmarkByteArray.arraysHashCode 127 avgt 5 83.459 ± 5.859
ns/op
BenchmarkByteArray.arraysHashCode 1023 avgt 5 678.600 ± 4.842
ns/op
BenchmarkByteArray.byteArrayHashCode 7 avgt 5 6.294 ± 0.021
ns/op
BenchmarkByteArray.byteArrayHashCode 127 avgt 5 56.796 ± 1.975
ns/op
BenchmarkByteArray.byteArrayHashCode 1023 avgt 5 406.462 ± 3.246
ns/op
```
## Upgrade Notes
Does this PR prevent a zero down-time upgrade? (Assume upgrade order:
Controller, Broker, Server, Minion)
* [ ] Yes (Please label as **<code>backward-incompat</code>**, and complete
the section below on Release Notes)
Does this PR fix a zero-downtime upgrade introduced earlier?
* [ ] Yes (Please label this as **<code>backward-incompat</code>**, and
complete the section below on Release Notes)
Does this PR otherwise need attention when creating release notes? Things to
consider:
- New configuration options
- Deprecation of configurations
- Signature changes to public methods/interfaces
- New plugins added or old plugins removed
* [ ] Yes (Please label this PR as **<code>release-notes</code>** and
complete the section on Release Notes)
## Release Notes
<!-- If you have tagged this as either backward-incompat or release-notes,
you MUST add text here that you would like to see appear in release notes of
the
next release. -->
<!-- If you have a series of commits adding or enabling a feature, then
add this section only in final commit that marks the feature completed.
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## Documentation
<!-- If you have introduced a new feature or configuration, please add it to
the documentation as well.
See
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-->
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