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https://issues.apache.org/jira/browse/HBASE-1964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-1964.
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Resolution: Duplicate
> 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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