We have a Spark standalone cluster running on 2.2.1 in HA mode using
Zookeeper. Occasionally, we have a rolling update where first the Primary
master goes down and then Secondary node and then zookeeper nodes running on
there own VMs. In the image below, 

<http://apache-spark-user-list.1001560.n3.nabble.com/file/t8018/image_%282%29.png>
 

Legends:
- Green line shows Secondary Master
- Yellow line shows Primary Master
- "1.0" on vertical axis shows STANDBY
- "5.0" on vertical axis shows UP

In the image you can see the strange behavior of Spark Master's.
- At 16:25 why did the masters switched roles between STANDBY and ALIVE?

Any help would be appreciated.



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