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https://issues.apache.org/jira/browse/HBASE-20498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-20498:
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Priority: Critical (was: Major)
> [AMv2] Stuck in UnexpectedStateException
> ----------------------------------------
>
> Key: HBASE-20498
> URL: https://issues.apache.org/jira/browse/HBASE-20498
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Priority: Critical
> Fix For: 2.0.1
>
>
> Here is how we get into a stuck scenario in hbase-2.0.0RC2.
> * Assign a region. It is moved to OPENING state then RPCs the RS.
> * RS opens region. Tells Master.
> * Master tries to complete the assign by updating hbase:meta.
> * hbase:meta is hosed because I'd deployed a bad patch that blocked
> hbase:meta updates
> * Master is stuck retrying RPCs to RS hosting hbase:meta; we want to update
> our new OPEN state in hbase:meta.
> * I kill Master because I want to fix the broke patch.
> * On restart, a script sets table to be DISABLED.
> * As part of startup, we go to assign regions.
> * We skip assigning regions because the table is DISABLED; i.e. we skip the
> replay of the unfinished assign.
> * The region is now a free-agent; no lock held, so, the queued unassign that
> is part of the disable table can run
> * It fails because region is in OPENING state, an UnexpectedStateException
> is thrown.
> We loop complaining the above.
> Resolution requires finishing previous assign first, then we can disable.
> Let me try and write a test to manufacture this state.
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