himanshug commented on issue #263: Theta sketch - Concurrent union 
implementation
URL: 
https://github.com/apache/incubator-datasketches-java/issues/263#issuecomment-509373302
 
 
   unfortunately it is very difficult to have answers for "expected query rate 
at real-time index" etc because it heavily depends on cluster to cluster.
   that said, even on realtime indexing process, IncrementalIndex (only place 
with concurrency) is persisted to a disk based structure periodically(or 
hitting memory/row thresholds) because disk based structure is highly optimized 
for read/queries (not just aggregations but it has other things like bitmap 
indexes for filtering, takes relatively less memory backed by disk so not 
counted as "anonymous memory" on linux) . "on most clusters", I wouldn't expect 
a large number or large sketch queries happening on IncrementalIndex .

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