jackjlli commented on issue #4183: High latency on high QPS use case URL: https://github.com/apache/incubator-pinot/issues/4183#issuecomment-488759202 One of the potential problems we suspect is that using on heap dictionary is not scalable, which keeps all the values of column1 in the memory. If the cardinality of the column is high (e.g. 10 million unique strings in each segment), and there're 10 segments in one offline server host, then retrieving string from hashmap would be a performance concern. Thus, we tried several trie based dictionary strategies to tackle this problem.
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