Andrew Purtell commented on HBASE-20597:

If the connection problem is persistent, like loss of shared trust between the 
clusters, we may accumulate unclosed ZKW instances over time, with a ZK send 
thread and event thread each, and eventually have enough leaked threads to 
cause OOME (cannot allocate native thread). 

> Use a lock to serialize access to a shared reference to ZooKeeperWatcher in 
> HBaseReplicationEndpoint
> ----------------------------------------------------------------------------------------------------
>                 Key: HBASE-20597
>                 URL: https://issues.apache.org/jira/browse/HBASE-20597
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.3.2, 1.4.4
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 3.0.0, 2.1.0, 1.5.0, 1.3.3, 2.0.1, 1.4.5
> The code that closes down a ZKW that fails to initialize when attempting to 
> connect to the remote cluster is not MT safe and can in theory leak 
> ZooKeeperWatcher instances. The allocation of a new ZKW and store to the 
> reference is not atomic. Might have concurrent allocations with only one 
> winning store, leading to leaked ZKW instances. 

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