Zero downtime index upgrade in Apache Solr
summary
Apache Solr now offers a zero-downtime in-place upgrade path (coming in 9.11 with Lucene changes exposed in 10.1/10.4) that converts older segments by reindexing them one segment at a time using a latest version merge policy, so work is proportional to only the old segments and auxiliary disk is roughly one segment. The core-admin API runs asynchronously, accepts writes during upgrade, requires fields to be stored or docValues (or copy-field targets), and the cloud API is in progress; design proves feasible on multi‑TB, billion‑document clusters.
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chapters (6)
- 0:00Introduction
- 1:25Problem and solution overview
- 10:42Upgrade Index API details
- 20:50Zero downtime upgrade process
- 23:02Implications for Lucene ecosystem
- 24:51Q&A session
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