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https://issues.apache.org/jira/browse/ZOOKEEPER-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868839#comment-15868839
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Michael Han commented on ZOOKEEPER-2678:
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[~rakeshr] - yes it was deliberately skipped as I was not sure whether to put
this in any releasing branch or not (that was before the discussions on whether
or not we put this in 3.4.10.). Now with this in 3.4.10 I don't see why it
should not be included 3.5.3. So I will merge this in 3.5. Thanks for the
double check.
> Large databases take a long time to regain a quorum
> ---------------------------------------------------
>
> Key: ZOOKEEPER-2678
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2678
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.9, 3.5.2
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Fix For: 3.4.10, 3.6.0
>
>
> I know this is long but please here me out.
> I recently inherited a massive zookeeper ensemble. The snapshot is 3.4 GB on
> disk. Because of its massive size we have been running into a number of
> issues. There are lots of problems that we hope to fix with tuning GC etc,
> but the big one right now that is blocking us making a lot of progress on the
> rest of them is that when we lose a quorum because the leader left, for what
> ever reason, it can take well over 5 mins for a new quorum to be established.
> So we cannot tune the leader without risking downtime.
> We traced down where the time was being spent and found that each server was
> clearing the database so it would be read back in again before leader
> election even started. Then as part of the sync phase each server will write
> out a snapshot to checkpoint the progress it made as part of the sync.
> I will be putting up a patch shortly with some proposed changes in it.
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