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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4813) Avoid a buffer copy while replying to RPC requests.
Date Tue, 09 Dec 2008 23:16:44 GMT
Avoid a buffer copy while replying to RPC requests.
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                 Key: HADOOP-4813
                 URL: https://issues.apache.org/jira/browse/HADOOP-4813
             Project: Hadoop Core
          Issue Type: Improvement
          Components: ipc
            Reporter: Raghu Angadi



RPC server first serializes RPC response to a ByteArrayOutputStream and then creates a new
array to write to socket. For most responses the RPC handler is able to write the entire response
in-line. If we could use the same buffer used by ByteArrayOutputStream, we can avoid this
copy. 

As mentioned in HADOOP-4802, yet another copy could be avoided (in most cases) if we use a
static direct buffer for the responses (not proposed for this jira).

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