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https://issues.apache.org/jira/browse/HBASE-17017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15637925#comment-15637925
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Enis Soztutar commented on HBASE-17017:
---------------------------------------
I've run PE with 1000 regions in a single server:
{code}
bin/hbase pe --latency --nomapred --presplit=1000 --valueSize=1000
--rows=100000 sequentialWrite 30
{code}
We are allocating ~1M LongAdder (former Counter) objects which is crazy. With a
simple patch, the allocations goes down to less than 0.5% of heap so that JFR
does not show it. The runtime for PE improves 17% because we are not spending
time on this code path any more:
{code}
private LongAdder[] createCounters(int numBins) {
return Stream.generate(LongAdder::new).limit(numBins +
3).toArray(LongAdder[]::new);
}
{code}
See attached screenshots.
> Remove the current per-region latency histogram metrics
> -------------------------------------------------------
>
> Key: HBASE-17017
> URL: https://issues.apache.org/jira/browse/HBASE-17017
> Project: HBase
> Issue Type: Sub-task
> Components: metrics
> Affects Versions: 2.0.0, 1.4.0
> Reporter: Duo Zhang
> Assignee: Enis Soztutar
> Fix For: 2.0.0, 1.4.0
>
>
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