drcrallen commented on issue #5913: Move Caching Cluster Client to java streams and allow parallel intermediate merges URL: https://github.com/apache/incubator-druid/pull/5913#issuecomment-465668271 For those finding this later, there are problems with GroupBy queries that are not appropriately addressed here. I think the split up between handling CachingClusterClient changes (which may or may not be needed) and enabling the GroupBy results merging to work better in parallel are really two different PRs and need addressed separately. I'm leaving the PR open for now as a reference, but it is unlikely to have any more development in favor of pursuing a more sustainable (and groupby compatible) approach
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