[jira] Commented: (HBASE-678) hbase needs a 'safe-mode'

["Daniel Leffel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627779#action_12627779 ] 

Daniel Leffel commented on HBASE-678:
-------------------------------------

One extra thing to tack onto this would be to block region balancing while in Safe Mode. Currently, I have 600 regions or so and as HBase is starting up, a lot of churn of regions closing and opening is happening during startup. It would be great if no balancing happened while in safe mode and then upon existing safe mode, regions got balanced.

> hbase needs a 'safe-mode'
> -------------------------
>
>                 Key: HBASE-678
>                 URL: https://issues.apache.org/jira/browse/HBASE-678
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: Jim Kellerman
>            Priority: Critical
>             Fix For: 0.19.0
>
>
> Internally we have a cluster of thousands of regions.  We just did a hbase restart w/ master on new node.  Just so happened that one of the regionservers was running extra slow (was downloaded by other processes).  Meant that its portion of the assigments was taking a long time to come up...  While these regions were stuck in deploy mode, the cluster is not useable.
> We need a sort of 'safe-mode' in hbase where clients fail if they try to attach to a cluster not yet fully up.  UI should show when all assignments have been successfully made so admin can at least see when they have a problematic regionserver in their midst.

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