compaction warnings: compaction plan conflict

[sfmqrb]

I’m getting a flood of compaction warnings like this:

failed to execute compaction task ... error="segment is compacting: compaction plan conflict"
Wraps: (2) segment is compacting
Wraps: (3) compaction plan conflict

Given that the planner only selects healthy, flushed, non-compacting (and indexed) segments, I’m trying to understand why these conflicts occur so often.

The downside is that I have enough small segments to fill the max_segment_size, but they don’t get merged because of these conflicts, so I end up with half-full segments.

My question: Is this behavior expected under a heavy write-ingestion workload?

Happy to provide more logs if needed.

[yhmo]

Which version of your milvus?

Possible related issue: #41962

[sfmqrb]

I see. It's 2.5.15.
It seems it could be related to the issue. right?

[xiaofan-luan]

this might not be a issue.
is there an outage you see? this might because of the mutex on some compaction types