Kannan Muthukkaruppan created HBASE-6217:
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Summary: reduce overhead of maintaing get/next size metric
Key: HBASE-6217
URL: https://issues.apache.org/jira/browse/HBASE-6217
Project: HBase
Issue Type: Improvement
Reporter: Kannan Muthukkaruppan
Assignee: Kannan Muthukkaruppan
[Forked off this specific issue as a separate JIRA from HBASE-6066].
Reduce overhead of "size metric" maintained in StoreScanner.next().
{code}
if (metric != null) {
HRegion.incrNumericMetric(this.metricNamePrefix + metric,
copyKv.getLength());
}
results.add(copyKv);
{code}
A single call to next() might fetch a lot of KVs. We can first add up the size
of those KVs in a local variable and then in a finally clause increment the
metric one shot, rather than updating AtomicLongs for each KV.
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