problems with read only mode, intermittent test failures and ERRORs in the log
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                 Key: ZOOKEEPER-1268
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1268
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.4.0, 3.5.0
            Reporter: Patrick Hunt
            Assignee: Patrick Hunt
            Priority: Blocker
             Fix For: 3.4.0, 3.5.0


I'm having a lot problems testing the 3.4.0 release candidate (0). I'm seeing 
frequent failures in RO unit tests, also the solaris tests are broken on 
jenkins, some of which is due to RO mode:
https://builds.apache.org/view/S-Z/view/ZooKeeper/job/ZooKeeper_trunk_solaris/30/#showFailuresLink

I'm also seeing ERROR level messages in the logs during test runs that are a 
result of attempting to start RO mode.

Given this is a new feature, one that could be very disruptive, I think we need 
to control whether the feature is enabled or not through a config option 
(system prop is fine), disabled by default.

I'll look at the RO mode tests to see if I can find the cause of the failures 
on solaris, but I may also turn off these tests for the time being. (I need to 
look at this further).


I'm marking this as a blocker for 3.4.0, Mahadev LMK if you feel similarly or 
whether I should be shooting for 3.4.1 with this. (or perhaps I'm just way off 
in general).



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