[hbase] performance: Try to purge servers of Text
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Key: HADOOP-2539
URL: https://issues.apache.org/jira/browse/HADOOP-2539
Project: Hadoop
Issue Type: Improvement
Components: contrib/hbase
Reporter: stack
Priority: Minor
Chatting with Jim while looking at profiler outputs, we should make an effort
at purging the servers of the Text type so HRegionServer doesn't ever have to
deal in Characters and the concomitant encode/decode to UTF-8. Toward this
end, we'd make changes like moving HStoreKey to have four rather than 3 data
members: column family, column family qualifier, row + timestamp done as a
basic Writable -- ImmutableBytesWritable? -- and a long rather than a Text
column, Text row and a timestamp long. This would save on our having to do the
relatively expensive 'find' of the column family separator inside in
extractFamily (>10% of CPU scanning). Chatting about it, we could effect the
change without change in the public client API; clients could continue to take
Text type for row and column and then client-side, the convertion to HStoreKey
could be done before crossing the wire to the server.
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