[jira] [Updated] (HBASE-5549) Master can fail if ZooKeeper session expires

["nkeywal (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

nkeywal updated HBASE-5549:
---------------------------

    Attachment: 5549.v6.patch

Contains the patch for HBASE-5572
                
> Master can fail if ZooKeeper session expires
> --------------------------------------------
>
>                 Key: HBASE-5549
>                 URL: https://issues.apache.org/jira/browse/HBASE-5549
>             Project: HBase
>          Issue Type: Bug
>          Components: master, zookeeper
>    Affects Versions: 0.96.0
>         Environment: all
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Minor
>         Attachments: 5549.v6.patch
>
>
> There is a retry mechanism in RecoverableZooKeeper, but when the session expires, the whole ZooKeeperWatcher is recreated, hence the retry mechanism does not work in this case. This is why a sleep is needed in TestZooKeeper#testMasterSessionExpired: we need to wait for ZooKeeperWatcher to be recreated before using the connection.
> This can happen in real life, it can happen when:
> - master & zookeeper starts
> - zookeeper connection is cut
> - master enters the retry loop
> - in the meantime the session expires
> - the network comes back, the session is recreated
> - the retries continues, but on the wrong object, hence fails.

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