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From "elsif (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1964) Add internal status monitoring to RegionServer
Date Mon, 09 Nov 2009 19:17:32 GMT
Add internal status monitoring to RegionServer

                 Key: HBASE-1964
                 URL: https://issues.apache.org/jira/browse/HBASE-1964
             Project: Hadoop HBase
          Issue Type: Improvement
          Components: client
    Affects Versions: 0.20.1
            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

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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