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https://issues.apache.org/jira/browse/HBASE-14479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-14479:
--------------------------
Attachment: flamegraph-19152.svg
flamegraph-32667.svg
[~ikeda] I tried with this patch again this evening. It seems to lower the
random read throughput (workloadc from YCSB) by some 7 or 8%.
Looking at a few flamegraphs, the character of the read loop has changed -- it
looks smoother with this patch -- and it costs slightly less in cpu w/ patch in
place but still we run slower (32668.svg is with your patch applied).
FYI
> Apply the Leader/Followers pattern to RpcServer's Reader
> --------------------------------------------------------
>
> Key: HBASE-14479
> URL: https://issues.apache.org/jira/browse/HBASE-14479
> Project: HBase
> Issue Type: Improvement
> Components: IPC/RPC, Performance
> Reporter: Hiroshi Ikeda
> Assignee: Hiroshi Ikeda
> Priority: Minor
> Attachments: HBASE-14479-V2 (1).patch, HBASE-14479-V2.patch,
> HBASE-14479-V2.patch, HBASE-14479.patch, flamegraph-19152.svg,
> flamegraph-32667.svg, gc.png, gets.png, io.png, median.png
>
>
> {{RpcServer}} uses multiple selectors to read data for load distribution, but
> the distribution is just done by round-robin. It is uncertain, especially for
> long run, whether load is equally divided and resources are used without
> being wasted.
> Moreover, multiple selectors may cause excessive context switches which give
> priority to low latency (while we just add the requests to queues), and it is
> possible to reduce throughput of the whole server.
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