Patrick Hunt reassigned ZOOKEEPER-562:

    Assignee: Benjamin Reed  (was: Mahadev konar)

Assigning to Ben. 

We should verify that something like this can't happen in the java either. From 
my looking
it seems not, but would be good to have addl verification.

> 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
> 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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