Daryn Sharp created HADOOP-9955:
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Summary: RPC idle connection closing is extremely inefficient
Key: HADOOP-9955
URL: https://issues.apache.org/jira/browse/HADOOP-9955
Project: Hadoop Common
Issue Type: Sub-task
Components: ipc
Affects Versions: 2.0.0-alpha, 3.0.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The RPC server listener loops accepting connections, distributing the new
connections to socket readers, and then conditionally & periodically performs a
scan for idle connections. The idle scan choses a _random index range_ to scan
in a _synchronized linked list_.
With 20k+ connections, walking the range of indices in the linked list is
extremely expensive. During the sweep, other threads (socket responder and
readers) that want to close connections are blocked, and no new connections are
being accepted.
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