btw, I described in my earlier comment why this ZK thread deadlock will lead to 
Auditor being non-functional - 

> If synchronous call - 'admin.openLedgerNoRecovery' in "checkLedgersProcessor" 
> is blocked as you explained, then 'processDone' latch is not counted down, 
> then "processDone.await()" in "checkAllLedgers" will be blocked forever. 
> Which will make 'executor' blocked, since 'executor' is 
> singleThreadScheduledExecutor, then IFIUC all of the Auditor functionality is 
> blocked, right?

[ Full content available at: https://github.com/apache/bookkeeper/pull/1608 ]
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