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| the process for updating old values should be higher latency in Druid. However, the requirements in Kudu for maintaining extra head space to store |
| updates as well as organizing data by id instead of time has the potential to introduce some extra latency and accessing |
| of data that is not needed to answer a query at query time.</p><p>Druid summarizes/rollups up data at ingestion time, which in practice reduces the raw data that needs to be |
| stored significantly (up to 40 times on average), and increases performance of scanning raw data significantly. |
| Druid segments also contain bitmap indexes for fast filtering, which Kudu does not currently support. |
| Druid's segment architecture is heavily geared towards fast aggregates and filters, and for OLAP workflows. Appends are very |
| fast in Druid, whereas updates of older data are higher latency. This is by design as the data Druid is good for is typically event data, |
| and does not need to be updated too frequently. Kudu supports arbitrary primary keys with uniqueness constraints, and |
| efficient lookup by ranges of those keys. Kudu chooses not to include the execution engine, but supports sufficient |
| operations so as to allow node-local processing from the execution engines. This means that Kudu can support multiple frameworks on the same data (e.g., MR, Spark, and SQL). |
| Druid includes its own query layer that allows it to push down aggregations and computations directly to data processes for faster query processing.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"></nav></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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