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https://issues.apache.org/jira/browse/ZOOKEEPER-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862584#comment-15862584
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Hudson commented on ZOOKEEPER-2678:
-----------------------------------
SUCCESS: Integrated in Jenkins build ZooKeeper-trunk #3273 (See
[https://builds.apache.org/job/ZooKeeper-trunk/3273/])
ZOOKEEPER-2678: Discovery and Sync can take a very long time on large (hanm:
rev bbfd0169417c316bbdd22ff7a38176845aa0efc6)
* (edit) src/java/main/org/apache/zookeeper/server/quorum/Learner.java
* (edit) src/java/main/org/apache/zookeeper/server/ZooKeeperServer.java
* (edit) src/java/main/org/apache/zookeeper/server/ZooKeeperServerMain.java
* (edit) src/java/test/org/apache/zookeeper/server/quorum/Zab1_0Test.java
> 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: 3.6.0
>
>
> 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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