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From "Virag Kothari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11659) Region state RPC call is not idempotent
Date Mon, 04 Aug 2014 16:38:11 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Virag Kothari updated HBASE-11659:

    Attachment: HBASE-11659.patch

> Region state RPC call is not idempotent
> ---------------------------------------
>                 Key: HBASE-11659
>                 URL: https://issues.apache.org/jira/browse/HBASE-11659
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
>         Attachments: HBASE-11659.patch
> Here is the scenario on 0.98 with zk-less assignment
> The master gets an OPEN RPC call from region server.
> So, it moves the region state from PENDING_OPEN to OPEN.
> But, the call timeouts on the region server and region server retries sending the OPEN
call. However, now the master throws an Exception saying the region is not PENDING_OPEN. So,
the region servers aborts the region on receiving that exception and sends FAILED_OPEN to
master. But the master cannot change its state from FAILED_OPEN to OPEN, so eventually the
master keeps the state as OPEN while the actual region is no longer open on region server.
> The master should not throw an exception on receiving OPEN RPC calls multiple times.

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