techdocsmith commented on a change in pull request #11541:
URL: https://github.com/apache/druid/pull/11541#discussion_r682069638
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File path: docs/ingestion/rollup.md
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@@ -0,0 +1,61 @@
+---
+id: rollup
+title: "Data rollup"
+sidebar_label: Data rollup
+description: Introducdes rollup as a concept. Provides suggestions to maximize
the benefits of rollup. Differentiates between perfect and best-effort rollup.
+---
+Druid can roll up data ingestion time to reduce the amount of raw data to
store on disk. Rollup is a form of summarization or pre-aggregation. Rolling up
data your can dramatically reduce the size of data to be store and reducing row
counts by potentially orders of magnitude. The trade off for the efficiency of
rollup means you lose the ability to query individual events.
Review comment:
Much better I think.
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