open-telemetry
/
opentelemetry-java
mirror of https://github.com/open-telemetry/opentelemetry-java.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Delete unused exponential histogram mergeInto (#5342)

This commit is contained in:
jack-berg 2023-04-02 20:58:37 -05:00 committed by GitHub
parent 25d767f899
commit 23107f8ecd
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 0 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/internal/aggregator/DoubleBase2ExponentialHistogramBuckets.java
View File

@ -124,58 +124,6 @@ final class DoubleBase2ExponentialHistogramBuckets implements ExponentialHistogr
this.base2ExponentialHistogramIndexer = Base2ExponentialHistogramIndexer.get(this.scale);
}
/**
* This method merges this instance with another set of buckets. It alters the underlying bucket
* counts and scale of this instance only, so it is to be used with caution.
*
* <p>The bucket counts of this instance will be added to or subtracted from depending on the
* additive parameter.
*
* <p>This algorithm for merging is adapted from NrSketch.
*
* @param other the histogram that will be merged into this one
*/
void mergeInto(DoubleBase2ExponentialHistogramBuckets other) {
if (other.counts.isEmpty()) {
return;
}
// Find the common scale, and the extended window required to merge the two bucket sets
int commonScale = Math.min(this.scale, other.scale);
// Deltas are changes in scale
int deltaThis = this.scale - commonScale;
int deltaOther = other.scale - commonScale;
long newWindowStart;
long newWindowEnd;
if (this.counts.isEmpty()) {
newWindowStart = other.getOffset() >> deltaOther;
newWindowEnd = other.counts.getIndexEnd() >> deltaOther;
} else {
newWindowStart = Math.min(this.getOffset() >> deltaThis, other.getOffset() >> deltaOther);
newWindowEnd =
Math.max(
(this.counts.getIndexEnd() >> deltaThis), (other.counts.getIndexEnd() >> deltaOther));
}
// downscale to fit new window
deltaThis += getScaleReduction(newWindowStart, newWindowEnd);
this.downscale(deltaThis);
// since we changed scale of this, we need to know the new difference between the two scales
deltaOther = other.scale - this.scale;
// do actual merging of other into this.
for (int i = other.getOffset(); i <= other.counts.getIndexEnd(); i++) {
if (!this.counts.increment(i >> deltaOther, other.counts.get(i))) {
// This should never occur if scales and windows are calculated without bugs
throw new IllegalStateException("Failed to merge exponential histogram buckets.");
}
}
this.totalCount += other.totalCount;
}
@Override
public int getScale() {
return scale;