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https://issues.apache.org/jira/browse/ZOOKEEPER-335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880919#action_12880919
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Patrick Hunt commented on ZOOKEEPER-335:
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Vishal comment on list:


Hi Flavio,

I have 3 set of logs and they all seem to indicate two problems on the
misbehaving follower:

Problem 1: Expected zxid is incorrect
=0    [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x300000002 expected
0x1
=0    [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x300000002 expected
0x1
=2495 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x400000001 expected
0x1
=2495 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x400000001 expected
0x1
=191617 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x500000001 expected
0x1
=191617 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x500000001 expected
0x1
=0    [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x600000001 expected
0x1
=0    [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x600000001 expected
0x1
=245016 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x700000001 expected
0x1
=245016 [QuorumPeer:/0.0.0.0:2181] WARN
org.apache.zookeeper.server.quorum.Learner  - Got zxid 0x700000001 expected
0x1

Note expected zxid is always 0x1 (lastQueued is always 0?)

Problem 2: While joining the cluster expected epoch is 1 higher than seen
earlier
=14991 [QuorumPeer:/0.0.0.0:2181] FATAL
org.apache.zookeeper.server.quorum.Learner  - Leader epoch 7 is less than
our epoch 8

-Vishal


> zookeeper servers should commit the new leader txn to their logs.
> -----------------------------------------------------------------
>
>                 Key: ZOOKEEPER-335
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-335
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.1.0
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>            Priority: Blocker
>             Fix For: 3.4.0
>
>         Attachments: zk.log.gz, zklogs.tar.gz
>
>
> currently the zookeeper followers do not commit the new leader election. This 
> will cause problems in a failure scenarios with a follower acking to the same 
> leader txn id twice, which might be two different intermittent leaders and 
> allowing them to propose two different txn's of the same zxid.

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