FLE election fails to elect leader

                 Key: ZOOKEEPER-512
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-512
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.2.0
            Reporter: Patrick Hunt
            Priority: Blocker
             Fix For: 3.2.1, 3.3.0

I was doing some fault injection testing of 3.2.1 with ZOOKEEPER-508 patch 
applied and noticed that after some time the ensemble failed to re-elect a 

See the attached log files - 5 member ensemble. typically 5 is the leader

Notice that after 16:23:50,525 no quorum is formed, even after 20 minutes 
elapses w/no quorum


I was doing fault injection testing using aspectj. The faults are injected into 
socketchannel read/write, I throw exceptions randomly at a 1/200 ratio 
(rand.nextFloat() <= .005 => throw IOException

You can see when a fault is injected in the log via:
2009-08-19 16:57:09,568 - INFO  [Thread-74:readrequestfailsintermitten...@38] - 

vs a read/write that didn't force fail:
2009-08-19 16:57:09,568 - INFO  [Thread-74:readrequestfailsintermitten...@41] - 

otw standard code/config (straight fle quorum with 5 members)

also see the attached jstack trace. this is for one of the servers. Notice in 
particular that the number of sendworkers != the number of recv workers.

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