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Posted to dev@zookeeper.apache.org by "Diogo (JIRA)" <ji...@apache.org> on 2011/04/14 12:58:05 UTC
[jira] [Commented] (ZOOKEEPER-876) Unnecessary snapshot transfers
between new leader and followers
[ https://issues.apache.org/jira/browse/ZOOKEEPER-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019780#comment-13019780 ]
Diogo commented on ZOOKEEPER-876:
---------------------------------
I provided a new patch for this issue. It works in current trunk. The patch fixes only issue 2 in the list above because the effects of issue 1 are minimal.
> Unnecessary snapshot transfers between new leader and followers
> ---------------------------------------------------------------
>
> Key: ZOOKEEPER-876
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-876
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.3.1
> Reporter: Diogo
> Assignee: Diogo
> Priority: Minor
> Fix For: 3.4.0
>
> Attachments: ZOOKEEPER-876.patch
>
>
> When starting a new leadership, unnecessary snapshot transfers happen between new leader and followers. This is so because of multiple small bugs.
> 1) the comparison of zxids is done based on a new proposal, instead of the last logged zxid. (LearnerFollower.java:310)
> 2) if follower is one zxid behind, the check of the interval of committed logs excludes the follower. (LearnerFollower.java:269)
> 3) the bug reported in ZOOKEEPER-874 (commitLogs are empty after recover).
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