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https://issues.apache.org/jira/browse/HADOOP-6132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728895#action_12728895
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Owen O'Malley commented on HADOOP-6132:
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Shouldn't the protocol be defined as:
Class<? extends VersionedProtocol> protocol;
> RPC client opens 2 connections per real protocol
> ------------------------------------------------
>
> Key: HADOOP-6132
> URL: https://issues.apache.org/jira/browse/HADOOP-6132
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Reporter: Kan Zhang
> Assignee: Kan Zhang
> Attachments: 1.patch
>
>
> RPC client caches connections per protocol. However, since all of our real
> protocols are subclasses of VersionedProtocol, a bug in the implementation
> makes the client opens an extra connection just for the VersionedProtocol,
> which is not needed.
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