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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14490) [RpcServer] reuse request read buffer
Date Fri, 16 Oct 2015 20:10:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961295#comment-14961295
] 

stack commented on HBASE-14490:
-------------------------------

[~gzh1992n] Question for you above Zephyr

> [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: ByteBufferPool.java, HBASE-14490-v1.patch, HBASE-14490-v10.patch,
HBASE-14490-v11.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 to every request free buffer.The idea
of optimization is to reduce the times that allocate ByteBuffer.
> *Modification*
> 1. {{saslReadAndProcess}} ,{{processOneRpc}}, {{processUnwrappedData}}, {{processConnectionHeader}}
accept a ByteBuffer instead of byte[].They can move {{ByteBuffer.position}} correctly when
we have read the data.
> 2. {{processUnwrappedData}} no longer use any extra memory.
> 3. Maintaining a reused ByteBuffer in each {{Connection}}.
> a) Size is dynamic to fit specific client.
> b) If size deviate far from average size, we replace a new one.
> c) Using a SoftReference to reference the buffer.



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