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https://issues.apache.org/jira/browse/HBASE-24615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157829#comment-17157829
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wenfeiyi666 commented on HBASE-24615:
-------------------------------------
branch-1 branch-1.3 branch-1.4 exists the bug, branch-1.0 branch-1.1 branch-1.2
not exists.
> MutableRangeHistogram#updateSnapshotRangeMetrics doesn't calculate the
> distribution for last bucket.
> ----------------------------------------------------------------------------------------------------
>
> Key: HBASE-24615
> URL: https://issues.apache.org/jira/browse/HBASE-24615
> Project: HBase
> Issue Type: Bug
> Components: metrics
> Affects Versions: 2.3.0, master, 1.3.7, 2.2.6
> Reporter: Rushabh Shah
> Assignee: wenfeiyi666
> Priority: Major
>
> We are not processing the distribution for last bucket.
> https://github.com/apache/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableRangeHistogram.java#L70
> {code:java}
> public void updateSnapshotRangeMetrics(MetricsRecordBuilder
> metricsRecordBuilder,
> Snapshot snapshot) {
> long priorRange = 0;
> long cumNum = 0;
> final long[] ranges = getRanges();
> final String rangeType = getRangeType();
> for (int i = 0; i < ranges.length - 1; i++) { -----> The bug lies
> here. We are not processing last bucket.
> long val = snapshot.getCountAtOrBelow(ranges[i]);
> if (val - cumNum > 0) {
> metricsRecordBuilder.addCounter(
> Interns.info(name + "_" + rangeType + "_" + priorRange + "-" +
> ranges[i], desc),
> val - cumNum);
> }
> priorRange = ranges[i];
> cumNum = val;
> }
> long val = snapshot.getCount();
> if (val - cumNum > 0) {
> metricsRecordBuilder.addCounter(
> Interns.info(name + "_" + rangeType + "_" + ranges[ranges.length -
> 1] + "-inf", desc),
> val - cumNum);
> }
> }
> {code}
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