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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1956) Export HDFS read and write latency as a metric
Date Thu, 05 Nov 2009 09:16:32 GMT
Export HDFS read and write latency as a metric
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                 Key: HBASE-1956
                 URL: https://issues.apache.org/jira/browse/HBASE-1956
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: Andrew Purtell
            Priority: Minor
             Fix For: 0.20.2, 0.21.0


HDFS write latency spikes especially are an indicator of general cluster overloading. We see
this where the WAL writer complains about writes taking > 1 second, sometimes > 4, etc.
 If for example the average write latency over the monitoring period is exported as a metric,
then this can feed into alerting for or automatic provisioning of additional cluster hardware.
While we're at it, export read side metrics as well.

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