Faster UUID comparisons
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Key: CASSANDRA-1043
URL: https://issues.apache.org/jira/browse/CASSANDRA-1043
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: James Golick
Priority: Minor
As I explained on the mailing list, doing slice queries on CFs that are sorted
by TimeUUIDType gets slower as the value of count increases. According to my
profiles, this is largely due to the fact that ConcurrentSkipListMap calls the
comparator very frequently, which is extremely inefficient. In order to compare
two UUIDs, it has to materialize them both in to java.util.UUID objects which
is quite slow. The more UUIDs to compare, the slower it is.
Attached is a patch that compares UUIDs by extracting the timestamp directly
from the byte[] representation. According to my tests, it's close to a 50%
performance improvement.
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