FLE should perform leader check when node is not leading and add vote of
follower
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Key: ZOOKEEPER-480
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-480
Project: Zookeeper
Issue Type: Bug
Reporter: Flavio Paiva Junqueira
Fix For: 3.2.1
As a server may join leader election while others have already elected a
leader, it is necessary that a server handles some special cases of leader
election when notifications are from servers that are either LEADING or
FOLLOWING. In such special cases, we check if we have received a message from
the leader to declare a leader elected. This check does not consider the case
that the process performing the check might be a recently elected leader, and
consequently the check fails.
This patch also adds a new case, which corresponds to adding a vote to recvset
when the notification is from a process LEADING or FOLLOWING. This fixes the
case raised in ZOOKEEPER-475.
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