lhotari opened a new pull request #12982:
URL: https://github.com/apache/pulsar/pull/12982


   ### Motivation
   
   - see https://issues.apache.org/jira/browse/ZOOKEEPER-1748 for details
     - "Setting this to true sets the TCP keepAlive flag on the sockets used by
        quorum members to perform elections. This will allow for connections 
between
        quorum members to remain up when there is network infrastructure that 
may
        otherwise break them.
        Some NATs and firewalls may terminate or lose state for long running
        or idle connections."
   
   ### Modifications
   
   Specify -Dzookeeper.tcpKeepAlive=true in default options for Zookeeper 
(`ZK_OPTS` in `bin/pulsar`)
   
   ### Documentation
   
   - [x] `no-need-doc` 


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