Luke Chen created KAFKA-16144:
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Summary: Controller leader checkQuorum timer should skip only 1
controller case
Key: KAFKA-16144
URL: https://issues.apache.org/jira/browse/KAFKA-16144
Project: Kafka
Issue Type: Bug
Reporter: Luke Chen
In KAFKA-15489, we fixed the potential "split brain" issue by adding the check
quorum timer. This timer will be updated when the follower fetch request
arrived. And it expires the timer when the there are no majority of voter
followers fetch from leader, and resign the leadership.
But in KAFKA-15489, we forgot to consider the case where there's only 1
controller node. If there's only 1 controller node (and no broker node), there
will be no fetch request arrived, so the timer will expire each time. However,
if there's only 1 node, we don't have to care about the "check quorum" at all.
We should skip the check for only 1 controller node case.
Currently, this issue will happen only when there's 1 controller node and no
any broker node (i.e. no fetch request sent to the controller).
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