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https://issues.apache.org/jira/browse/HBASE-29253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Charles Connell updated HBASE-29253:
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Attachment: scenario-alloc-hs26.html
> Avoid allocating a new closure on every row processed by StoreScanner
> ---------------------------------------------------------------------
>
> Key: HBASE-29253
> URL: https://issues.apache.org/jira/browse/HBASE-29253
> Project: HBase
> Issue Type: Improvement
> Reporter: Charles Connell
> Assignee: Charles Connell
> Priority: Minor
> Attachments: scenario-alloc-hs26.html
>
>
> I've looked at a lot of allocation profiles of RegionServers doing a
> read-heavy workload. Some allocations that dominate the chart can be easily
> avoided. The method {{StoreScanner#read()}} contains this code
> {code}
> heap.recordBlockSize(blockSize -> {
> if (rpcCall.isPresent()) {
> rpcCall.get().incrementBlockBytesScanned(blockSize);
> }
> scannerContext.incrementBlockProgress(blockSize);
> });
> {code}
> that runs for every iteration of its main loop. On the attached profile, the
> resulting closures account for 11% of the allocations done. A closure can be
> created before the loop and re-used instead.
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