> 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

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
An obvious improvement would be to manually denormalise the collection

ref: https://github.com/openzipkin/zipkin/issues/1861#issuecomment-353510778


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