c client can flood server with pings if tcp send queue filled
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Key: ZOOKEEPER-562
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-562
Project: Zookeeper
Issue Type: Bug
Components: c client
Affects Versions: 3.2.1
Reporter: Patrick Hunt
Assignee: Mahadev konar
Priority: Blocker
Fix For: 3.2.2, 3.3.0
The c client can flood the server with pings if the tcp queue is filled.
Say the cluster is overloaded and shuts down the recv processing
a c client can send a ping, but since last_send is only updated on successful
pushing of data into the
socket, if flush_send_queue fails to send any data (send_buffer returns 0) then
last_send is not updated
and zookeeper_interest will again send a ping the next time it is woken - which
could be 0 if recv_to is close
to 0, easily could happen if server is not sending data to the client.
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