Sam Mikes created ZOOKEEPER-4210:
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             Summary: Zookeeper c client does not propagate error on 
opportunistic async send
                 Key: ZOOKEEPER-4210
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4210
             Project: ZooKeeper
          Issue Type: Bug
          Components: c client
    Affects Versions: 3.6.2, 3.4.14, 3.7.0
         Environment: Observed on Linux 3.x 4.x 5.x Centos distributions.
            Reporter: Sam Mikes


When an async operation is performed in the C client, the client will attempt 
to send the command to the server if this would not block.

When this send reports an error (eg: EPIPE) this is reported up to the async 
message, but the return code is not stored and checked, making it impossible 
for the user of the c client library to identify this case.

This can eventually trigger an assertion in some IO libraries, eg libev, 
because the file descriptor libev is watching is not associated with a valid 
stream. 



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