Eshcar commented on issue #8126: [Proposal] BufferAggregator support for growable sketches. URL: https://github.com/apache/incubator-druid/issues/8126#issuecomment-517273629 @himanshug - What is the context of the current proposal? Does it refers to aggregators that are used only in the context of queries, when querying immutable segments that are cached off-heap? Does it also cover off-heap incremental index roll-up aggregation? If it is the first then it is reasonable to define an API for external memory allocator, if it is the second then what I am suggesting is more relevant. Note that Oak is considered as a core contrib and not extension, and is proposed as an efficient alternative for the existing off-heap incremental index. Which brings me back to my previous question - does the current off-heap incremental index considered operational, with reasonable performance? I think that by introducing a new writable memory aggregator we avoid backward compatibility issues, do we not?
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