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From "Zephyr Guo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14490) [RpcServer] reuse request read buffer
Date Thu, 01 Oct 2015 17:35:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940110#comment-14940110

Zephyr Guo commented on HBASE-14490:

Yes, large buffer more useful and pooI is troublesome.
I find a silly wrong...I use buffer in {{Connection}}, but multi Connection share one {Reader}(single
I should maintain a suitable buffer each Reader.It's a easy way for optimizing.
Shared pool is a perfect way but we need a low cost way of sharing.I will think on it.It can
be another issue?

very thanks.

> [RpcServer] reuse request read buffer
> -------------------------------------
>                 Key: HBASE-14490
>                 URL: https://issues.apache.org/jira/browse/HBASE-14490
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC
>    Affects Versions: 2.0.0, 1.0.2
>            Reporter: Zephyr Guo
>            Assignee: Zephyr Guo
>              Labels: performance
>             Fix For: 2.0.0, 1.0.2
>         Attachments: HBASE-14490-v1.patch, HBASE-14490-v10.patch, HBASE-14490-v2.patch,
HBASE-14490-v3.patch, HBASE-14490-v4.patch, HBASE-14490-v5.patch, HBASE-14490-v6.patch, HBASE-14490-v7.patch,
HBASE-14490-v8.patch, HBASE-14490-v9.patch
> Reuse buffer to read request.It's not necessary free data's buffer for each request.Optimization
is to reduce the times that allocate ByteBuffer.
> *patch modification*
> * {{saslReadAndProcess}} and {{processOneRpc}} accept a ByteBuffer instead of byte[].
> * {{processUnwrappedData}} can reuse the same ByteBuffer that {{saslReadAndProcess}}
> * Maintaining a reused ByteBuffer each {{Connection}} for small request.
> ** Buffer size is fixed.
> ** Using a SoftReference to reference the buffer.
> ** If request is too large, we allocate a temporary ByteBuffer.Freeing it when  {{process()}}
will have been finished.

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