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Posted to dev@zookeeper.apache.org by "Mahadev konar (JIRA)" <ji...@apache.org> on 2012/09/07 05:47:08 UTC
[jira] [Updated] (ZOOKEEPER-1462) Read-only server does not
initialize database properly
[ https://issues.apache.org/jira/browse/ZOOKEEPER-1462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mahadev konar updated ZOOKEEPER-1462:
-------------------------------------
Fix Version/s: (was: 3.4.4)
3.4.5
Moving it out since we do not have a patch.
> 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: 3.5.0, 3.4.5
>
> 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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