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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2018/12/06 13:41:18 UTC
[GitHub] kaijianding edited a comment on issue #6716: [Proposal] exactly
count distinct support in Druid
kaijianding edited a comment on issue #6716: [Proposal] exactly count distinct support in Druid
URL: https://github.com/apache/incubator-druid/issues/6716#issuecomment-444873711
@pzhdfy it sounds different with http://druid.io/docs/latest/development/extensions-contrib/distinctcount.html which is only for batch ingestion and only for one dimension.
Could you explain more on how count distinct is done across segments?
Is global uniq ID global across all segments or just a period like one day(the period you do offline batch ingest)? Is global uniq ID generated on a central server like coordinator, or an algorithm which can ensure id is always different in different segments?
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