[jira] Commented: (ZOOKEEPER-480) FLE should perform leader check when node is not leading and add vote of follower

["Mahadev konar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738732#action_12738732 ] 

Mahadev konar commented on ZOOKEEPER-480:
-----------------------------------------

flavio, canm you upload 3.2 patch as well?

> FLE should perform leader check when node is not leading and add vote of follower
> ---------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-480
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-480
>             Project: Zookeeper
>          Issue Type: Bug
>    Affects Versions: 3.2.0
>            Reporter: Flavio Paiva Junqueira
>            Assignee: Flavio Paiva Junqueira
>             Fix For: 3.2.1, 3.3.0
>
>         Attachments: ZOOKEEPER-480-3.2branch.patch, ZOOKEEPER-480.patch, ZOOKEEPER-480.patch, ZOOKEEPER-480.patch, ZOOKEEPER-480.patch, ZOOKEEPER-480.patch
>
>
> 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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