[jira] [Created] (HBASE-14490) [RpcServer] reuse buffer and more stricter code

["Zephyr Guo (JIRA)" <ji...@apache.org>]

Zephyr Guo created HBASE-14490:
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             Summary: [RpcServer] reuse buffer and more stricter code
                 Key: HBASE-14490
                 URL: https://issues.apache.org/jira/browse/HBASE-14490
             Project: HBase
          Issue Type: Improvement
          Components: IPC/RPC
            Reporter: Zephyr Guo
            Assignee: Zephyr Guo


1.Reuse buffer to read request.
It's not necessary free data's buffer for each request.

2.There are hidden trouble in socket IO with non-blocking mode.
We just use *channel.read(byteBuffer)* to read data of request(byteBuffer.limit=dataLength).We need *dataLength* bytes but read maybe not fill the *byteBuffer*.
The link is the *read(byteBuffer)* method describe:http://docs.oracle.com/javase/7/docs/api/java/nio/channels/SocketChannel.html#read(java.nio.ByteBuffer)

I write a sample to test it(Test.java).


3.*channelIO()* method return value
More stricter return value.


So I rewrite *channelIO*.It can work well with non-blocking and back small IO(size<NIO_BUFFER_LIMIT) or large.



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