c-client can spin when server unresponsive
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Key: ZOOKEEPER-542
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-542
Project: Zookeeper
Issue Type: Bug
Components: c client
Affects Versions: 3.2.0
Reporter: Christian Wiedmann
Due to a mismatch between zookeeper_interest() and zookeeper_process(), when
the zookeeper server is unresponsive the client can spin when reconnecting to
the server.
In particular, zookeeper_interest() adds ZOOKEEPER_WRITE whenever there is data
to be sent, but flush_send_queue() only writes the data if the state is
ZOO_CONNECTED_STATE. When in ZOO_ASSOCIATING_STATE, this results in spinning.
This probably doesn't affect production, but I had a runaway process in a
development deployment that caused performance issues on the node. This is
easy to reproduce in a single node environment by doing a kill -STOP on the
server and waiting for the session timeout.
Patch to be added.
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