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Date: Wed, 30 Mar 2011 00:04:05 +0000 (UTC)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: common-dev@hadoop.apache.org
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Subject: [jira] [Created] (HADOOP-7212) Reuse connection
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Reuse connection
----------------

                 Key: HADOOP-7212
                 URL: https://issues.apache.org/jira/browse/HADOOP-7212
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang


One of my recent RPC change introduced a regression. It makes the first RPC to server, getProtocolSignature, and following RPCs not sharing the same connection. If all clients are short lived, this regression would double the number of connections in the cluster.

The cause of the regression is that getProtocolSingature uses VersionProtocol to create a Connection object, and the following RPCs uses its own protocol name like ClientProtocol. Since protocol name is part of Connection object hashcode, this forces the RPC client to create a new Connection object, therefore forcing to create a new TCP/IP connection.

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