Reuse connection
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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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