[jira] [Assigned] (HBASE-4245) Cluster hangs if RS serving root fails during startup sequence

["Ming Ma (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-4245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ming Ma reassigned HBASE-4245:
------------------------------

    Assignee: Ming Ma  (was: ramkrishna.s.vasudevan)

> Cluster hangs if RS serving root fails during startup sequence
> --------------------------------------------------------------
>
>                 Key: HBASE-4245
>                 URL: https://issues.apache.org/jira/browse/HBASE-4245
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.3
>            Reporter: Todd Lipcon
>            Assignee: Ming Ma
>
> On a large-ish cluster, the following sequence of events was seen to happen:
> - master started, ROOT and META were both unassigned
> - ROOT is assigned to rs01
> - META is assigned to rs02
> - Upon open of META, it writes its location into ROOT on rs01
> - rs01 crashes while appending to its HLog due to some other bug
> - rs02 fails the region open sequence
> - master notices that rs01 has crashed, and enqueues a ServerShutdownHandler
> - ServerShutdownHandler blocks on CatalogTracker.waitForMeta() since ROOT and META are not assigned yet
> - master times out assignment of META, but never succeeds because ROOT location is still marked as rs01
> This causes the cluster to never start up.

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