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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6621) Reduce calls to Bytes.toInt
Date Mon, 20 Aug 2012 23:49:38 GMT
Lars Hofhansl created HBASE-6621:
------------------------------------

             Summary: Reduce calls to Bytes.toInt
                 Key: HBASE-6621
                 URL: https://issues.apache.org/jira/browse/HBASE-6621
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
            Assignee: Lars Hofhansl


Bytes.toInt shows up quite often in a profiler run.
It turns out that one source is HFileReaderV2$ScannerV2.getKeyValue().

Notice that we call the KeyValue(byte[], int) constructor, which forces the constructor to
determine its size by reading some of the header information and calculate the size. In this
case, however, we already know the size (from the call to readKeyValueLen), so we could just
use that.

In the extreme case of 10000's of columns this noticeably reduces CPU. 

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