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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11767) [0.94] Unnecessary garbage produced by schema metrics during scanning
Date Sat, 16 Aug 2014 07:25:18 GMT
Lars Hofhansl created HBASE-11767:
-------------------------------------

             Summary: [0.94] Unnecessary garbage produced by schema metrics during scanning
                 Key: HBASE-11767
                 URL: https://issues.apache.org/jira/browse/HBASE-11767
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
            Assignee: Lars Hofhansl
             Fix For: 0.94.23


Near the end of StoreScanner.next(...) we find this gem:
{code}
    } finally {
      if (cumulativeMetric > 0 && metric != null) {
        RegionMetricsStorage.incrNumericMetric(this.metricNamePrefix + metric,
            cumulativeMetric);
      }
    }
{code}

So, for each row generated we build up a new metric string, that will be identical for each
invocation of the StoreScanner anyway (a store scanner is valid for at most one region and
one operation).




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