> I use zipkin (https://github.com/openzipkin/zipkin) to trace my system. > > When I upgraded to the latest version ,3.23 be specific. I met a problem which our monitor keep alerting that there is not enough disk space for cassandra.
You're right. CONTAINS SASI indexes do indeed use a lot of disk space. If you don't search by annotations in Zipkin feel free to drop that index. `DROP INDEX zipkin2.span (annotation_query)` We're looking into a more effective approach with this. The CONTAINS SASI was used here because SASI on collections are not yet supported: CASSANDRA-11182 <https://issues.apache.org/jira/browse/CASSANDRA-11182> An obvious improvement would be to manually denormalise the collection first. ref: https://github.com/openzipkin/zipkin/issues/1861#issuecomment-353510778 regards, Mick