Druid data drops and tasks are converted into segments

When the Druid data drops, some tasks in a certain time range do not report errors, but can not be written into segments, while other tasks can be written normally. What is the reason for this situation?

Druid obtains locks on the segments while doing writes / drops. It’s possible that what you are trying to drop is a range of data segments which are being written to. Carefully review middlemanager /historical logs to see what’s happening.