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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11876) RegionScanner.nextRaw(...) should not update metrics
Date Tue, 02 Sep 2014 04:54:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-11876:
----------------------------------
    Summary: RegionScanner.nextRaw(...) should not update metrics  (was: RegionScanner.nextRaw(...)
should update metrics)

> RegionScanner.nextRaw(...) should not update metrics
> ----------------------------------------------------
>
>                 Key: HBASE-11876
>                 URL: https://issues.apache.org/jira/browse/HBASE-11876
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.6
>            Reporter: Lars Hofhansl
>
> I added the RegionScanner.nextRaw(...) to allow "smart" client to avoid some of the default
work that HBase is doing, such as {start|stop}RegionOperation and synchronized(scanner) for
each row.
> Metrics should follow the same approach. Collecting them per row is expensive and a caller
should have the option to collect those later or to avoid collecting them completely.
> We can also save some cycles in RSRcpServices.scan(...) if we updated the metric only
once/batch instead of each row.



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