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https://issues.apache.org/jira/browse/ZOOKEEPER-1462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754548#comment-13754548
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Flavio Junqueira commented on ZOOKEEPER-1462:
---------------------------------------------
I'd like to consider this issue for 3.4.6. I was looking at how to write a test
case for this issue and realized that it was very close to
testConnectionEvents() in ReadOnlyModeTest. This test doesn't seem to fail
without this patch, though, and I would expect it to fail. I originally thought
it was because we were not using an observer in that test, but I couldn't find
a reasonable explanation for that being the case. If you have any insight here,
[~thawan], I would appreciate.
> Read-only server does not initialize database properly
> ------------------------------------------------------
>
> Key: ZOOKEEPER-1462
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1462
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.3
> Reporter: Thawan Kooburat
> Assignee: Thawan Kooburat
> Priority: Critical
> Fix For: 3.4.6
>
> Attachments: ZOOKEEPER-1462.patch
>
>
> Brief Description:
> When a participant or observer get partitioned and restart as Read-only
> server. ZkDb doesn't get reinitialized. This causes the RO server to drop any
> incoming request with zxid > 0
> Error message:
> Refusing session request for client /xx.xx.xx.xx:39875
> as it has seen zxid 0x2e00405fd9 our last zxid is 0x0 client must try another
> server
> Steps to reproduce:
> Start an RO-enabled observer connecting to an ensemble. Kill the ensemble and
> wait until the observer restart in RO mode. Zxid of this observer should be 0.
> Description:
> Before a server transition into LOOKING state, its database get closed as
> part of shutdown sequence. The database of leader, follower and observer get
> initialized as a side effect of participating in leader election protocol.
> (eg. observer will call registerWithLeader() and call getLastLoggedZxid()
> which initialize the db if not already).
> However, RO server does not participate in this protocol so its DB doesn't
> get initialized properly
>
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