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https://issues.apache.org/jira/browse/ZOOKEEPER-562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771607#action_12771607
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Mahadev konar commented on ZOOKEEPER-562:
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+1 this looks good.
> c client can flood server with pings if tcp send queue filled
> -------------------------------------------------------------
>
> 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: Benjamin Reed
> Priority: Blocker
> Fix For: 3.2.2, 3.3.0
>
> Attachments: ZOOKEEPER-562.patch
>
>
> 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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