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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-4813) Avoid a buffer copy while replying to RPC requests.
Date Thu, 11 Aug 2011 18:18:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HADOOP-4813:
--------------------------------

    Description: 
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).

  was:

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).

         Labels: newbie  (was: )

> Avoid a buffer copy while replying to RPC requests.
> ---------------------------------------------------
>
>                 Key: HADOOP-4813
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4813
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Raghu Angadi
>              Labels: newbie
>
> 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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