Re: [druid-user] ingestion followed by delete segment delays the latter?

My guess would be there’s write lock of some kind on segments for the interval that the row is in. (How do you delete a row in druid?)
If so, then when the task completes (perhaps taskDuration is 1H?), the lock can be released and your deletion can go through.
https://druid.apache.org/docs/latest/ingestion/tasks.html#locking