[performance] Cache family maxversions; we were calculating on each access
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Key: HBASE-1355
URL: https://issues.apache.org/jira/browse/HBASE-1355
Project: Hadoop HBase
Issue Type: Bug
Reporter: stack
Profiling I see we are calculating max versions each time:
{code}
String value = getValue(HConstants.VERSIONS);
this.cachedMaxVersions = (value != null)?
Integer.valueOf(value).intValue(): DEFAULT_VERSIONS;
{code}
Caching it should improve things. Seeing that its 10% of memory when writing
and about 10% of CPU. Reading its 10% of CPU according to profiler.
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