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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9716) Move the Rpc request call ID generation to client side InvocationHandler
Date Sat, 13 Jul 2013 17:53:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707794#comment-13707794
] 

Suresh Srinivas commented on HADOOP-9716:
-----------------------------------------

bq. BTW, since rpc retries use the same Call ID, we need to use Call ID and Retry # as a key
to identify rpc calls. We need to change the protocol to support it.
Is it really required?

Currently a client retries in following cases:
# On some special exceptions (connection could not be established, StandbyException). In this
case the call Id outstanding request in the map will be deleted since the client received
response.
# When response could not be received. In this case on timeout we should also remove the outstanding
request in the map before retrying.
                
> Move the Rpc request call ID generation to client side InvocationHandler
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-9716
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9716
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Suresh Srinivas
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: c9716_20130712b.patch, c9716_20130712.patch, c9716_20130713b.patch,
c9716_20130713c.patch, c9716_20130713.patch
>
>
> Currently when RetryInvocationHandler is used to retry an RPC request, a new RPC request
call ID is generated. This jira proposes moving call ID generation to InvocationHandler so
that retried RPC requests retain the same call ID. This is needed for RetryCache functionality
proposed in HDFS-4942.

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