Lars Hofhansl created HBASE-6621:
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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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