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https://issues.apache.org/jira/browse/HBASE-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-14757.
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Resolution: Not A Problem
> Reduce allocation pressure imposed by HFile block processing
> ------------------------------------------------------------
>
> Key: HBASE-14757
> URL: https://issues.apache.org/jira/browse/HBASE-14757
> Project: HBase
> Issue Type: Improvement
> Reporter: Andrew Kyle Purtell
> Priority: Major
>
> Using Flight Recorder to look at the object allocation profiles of
> regionservers processing the various YCSB workloads when block encoding is
> enabled (specifically, FAST_DIFF, but this applies to any), we can see:
> - Allocations of byte[] for block encoding contribute 40-70% of all
> allocation pressure in TLABs.
> - Of that subset of allocation pressure, ~50-70% is byte[] for SeekerState
> - Greater than 99% of allocation of byte[] outside of TLABs are for read
> buffers for HFileBlock#readBlockDataInternal.
> This issue is for investigation of strategy for and impact of reducing that
> allocation pressure. Reducing allocation pressure reduces demand for GC,
> which reduces GC activity overall, which reduces a source of system latency.
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