[jira] [Updated] (HBASE-14757) Reduce allocation pressure imposed by HFile block processing

["Andrew Purtell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell updated HBASE-14757:
-----------------------------------
    Fix Version/s:     (was: 0.98.17)
                       (was: 1.3.0)

> 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 Purtell
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0
>
>
> 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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