optimize Memtable.getSliceIterator
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Key: CASSANDRA-1046
URL: https://issues.apache.org/jira/browse/CASSANDRA-1046
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Fix For: 0.7
As reported by James Golick, about 30% of the time in a read is spent in
SliceQueryFilter.getMemColumnIterator, virtually all of which is in
ConcurrentSkipListMap$Values.toArrray().
I wrote on the ML:
Besides the UUID optimization you posted, we should do an audit of
ColumnFamily.getSortedColumns and replace with iteration where possible (in
this case, we'd be left with one copy of most of the columns, but that's better
than two).
We can get rid of the other copy by fixing the logic in
Memtable.getSliceIterator, which says "copy all the columns, so we can do a
binary search on them to find where to start," but since columns are natively
in sorted order we could just use an iterator and a while loo
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