[
https://issues.apache.org/jira/browse/ZOOKEEPER-790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893236#action_12893236
]
Flavio Junqueira commented on ZOOKEEPER-790:
--------------------------------------------
Thanks for reviewing, Mahadev. The interrupt is necessary to guarantee that we
will break this loop:
{noformat}
+ /*
+ * Wait until leader starts up
+ */
+ synchronized(leader.zk){
+ while(!leader.zk.isRunning()){
+ leader.zk.wait(500);
+ }
+ }
{noformat}
when shutting down the learner handler.
> Last processed zxid set prematurely while establishing leadership
> -----------------------------------------------------------------
>
> Key: ZOOKEEPER-790
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-790
> Project: Zookeeper
> Issue Type: Bug
> Components: quorum
> Affects Versions: 3.3.1
> Reporter: Flavio Junqueira
> Assignee: Flavio Junqueira
> Priority: Blocker
> Fix For: 3.3.2, 3.4.0
>
> Attachments: ZOOKEEPER-790-3.3.patch, ZOOKEEPER-790-3.3.patch,
> ZOOKEEPER-790-follower-request-NPE.log, ZOOKEEPER-790-test.patch,
> ZOOKEEPER-790.patch, ZOOKEEPER-790.patch, ZOOKEEPER-790.patch,
> ZOOKEEPER-790.patch, ZOOKEEPER-790.patch, ZOOKEEPER-790.travis.log.bz2,
> ZOOKEEPER-790.v2.patch, ZOOKEEPER-790.v2.patch
>
>
> The leader code is setting the last processed zxid to the first of the new
> epoch even before connecting to a quorum of followers. Because the leader
> code sets this value before connecting to a quorum of followers
> (Leader.java:281) and the follower code throws an IOException
> (Follower.java:73) if the leader epoch is smaller, we have that when the
> false leader drops leadership and becomes a follower, it finds a smaller
> epoch and kills itself.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
