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[GitHub] Eshcar commented on issue #3956: Thread safe reads for aggregators in IncrementalIndex


Eshcar commented on issue #3956: Thread safe reads for aggregators in IncrementalIndex
URL: https://github.com/apache/incubator-druid/pull/3956#issuecomment-406869180
 
 
   > Synchronization should be done inside aggregators, because simple aggregators could use cheaper atomics instead of intrinsic locks.
   
   I agree. This is what we hope to do now in sketches-core, add concurrent (thread-safe) sketches that use lightweight synchronization. The first step is adding concurrent theta sketch, which can be followed by a concurrent union implementation. Later additional concurrent sketches can be added to the library (we already have an implementation of a concurrent quantile sketch).  

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