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From "dhruba borthakur (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4989) Metrics to measure sequential reads and random reads separately
Date Mon, 12 Dec 2011 04:56:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HBASE-4989:
------------------------------------

    Release Note: The metric fsReadLatency records the number of sequential reads. The metric
fsPreadLatency records the number of random reads.
    Hadoop Flags: Incompatible change
          Status: Patch Available  (was: Open)
    
> Metrics to measure sequential reads and random reads separately
> ---------------------------------------------------------------
>
>                 Key: HBASE-4989
>                 URL: https://issues.apache.org/jira/browse/HBASE-4989
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>            Priority: Minor
>         Attachments: metrics1.txt
>
>
> HBase does sequential reads for compactions and positional random reads for satisfying
user's queries. It would be nice if we can measure their latencies separately. It is mostly
the random reads that dominate a transactional workload.

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