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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14479) Apply the Leader/Followers pattern to RpcServer's Reader
Date Sun, 11 Oct 2015 04:37:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack updated HBASE-14479:
    Attachment: gets.png

Some pictures. I ran YCSB four loadings C (100% random read). The first was branch-1, the
second was branch-1 + this patch, the third run was also branch-1 + this patch, and then the
fourth run was w/o the patch (same as first run; i.e. run 1 and 4 were without the patch and
runs 2 and 3 were with the patch). I restarted between run 1 and 2 and between 3 and 4.

High-level, throughput is slightly up (depedent on the run..the differences are pretty erratic).

Median, 75th and 95th are about the same... maybe less w/ the patch applied.

GC time may be less w/ the patch (the fourth run which is w/o the patch has less GC but it
is doing way less gets).

Load w/ patch seems slightly less w/ patch... i/os are about same across the runs.

High-level, no regression (probably some benefit discernible at this macro-level).

I'll commit the patch.

> 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, 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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