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https://issues.apache.org/jira/browse/HDFS-13633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16493998#comment-16493998
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CR Hota commented on HDFS-13633:
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[~elgoiri] Could you please add me to the contributors list.
I plan to assign this to myself.
> RBF: Synchronous way to create RPC client connections to NN
> -----------------------------------------------------------
>
> Key: HDFS-13633
> URL: https://issues.apache.org/jira/browse/HDFS-13633
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: federation
> Reporter: CR Hota
> Priority: Major
>
> Currently the router code does the following.
> # IPC handler thread gets a connection from the pool, even if the connection
> is NOT usable.
> # At the same time the IPC thread also submits a request to connection
> creator thread for adding a new connection to the pool asynchronously.
> # The new connection is NOT utilized by the IPC threads that get back an
> unusable connection.
> With this approach burst behaviors of clients, fill up the pool without
> necessarily using the connections. Also the approach is indeterministic.
> We propose a flag that can allow router admins to control the behavior of
> getting connections by the IPC handler threads. The flag would allow to
> toggle ON/OFF asynchronous vs synchronous way of connection creation.
> In the new model, if a connection is unusable, IPC handler thread would go
> ahead and create a connection and add to the pool and utilize it
> subsequently. It would still utilize the unusable connection if the pool is
> full.
>
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