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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-596) The last logged zxid calculated by zookeeper servers could cause problems in leader election if data gets corrupted.
Date Thu, 17 Dec 2009 21:38:18 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792142#action_12792142
] 

Benjamin Reed commented on ZOOKEEPER-596:
-----------------------------------------

+1 (assuming it passes test)

> The last logged zxid calculated by zookeeper servers could cause problems in leader election
if data gets corrupted.
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-596
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-596
>             Project: Zookeeper
>          Issue Type: Bug
>    Affects Versions: 3.2.1
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>             Fix For: 3.3.0
>
>         Attachments: ZOOKEEPER-596.patch, ZOOKEEPER-596.patch, ZOOKEEPER-596.patch, ZOOKEEPER-596.patch,
ZOOKEEPER-596.patch, ZOOKEEPER-596.patch
>
>
> It is possible that the last loggged zxid as reported by all the servers during leader
election is not the last zxid that the server can upload data to. It is very much possible
that some transaction or snapshot gets corrupted and the servers actually do not have valid
data till last logged zxid. We need to make sure that what the servers report as there last
logged zxid, they are able to load data till that zxid.

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