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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1964) Enter temporary "safe mode" to ride over transient FS layer problems
Date Sat, 13 Apr 2013 01:09:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630844#comment-13630844
] 

Andrew Purtell commented on HBASE-1964:
---------------------------------------

Superseded by HBASE-8338 and related.
                
> Enter temporary "safe mode" to ride over transient FS layer problems
> --------------------------------------------------------------------
>
>                 Key: HBASE-1964
>                 URL: https://issues.apache.org/jira/browse/HBASE-1964
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>            Reporter: elsif 
>
> When a hadoop/hbase cluster is under heavy load it will inevitably reach a tipping point
where data is lost or corrupted.  A
> graceful method is needed to put the cluster into safe mode until more resources can
be added or the load on the cluster has been
> reduced.  
> St.Ack has suggested the following short-term task: "Meantime, it should be possible
to have a cron run a script that checks
> cluster resources from time-to-time -- e.g. how full hdfs is, how much each regionserver
is carrying -- and when it determines the needle is in the red,
> flip the cluster to be read-only."

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