Hi Kai, Under unaligned checkpoint settings, there are still alignment process. Although the task could snapshot the state of the operators on received the first barrier and emit barriers to the following tasks, it still need to wait till all the barriers to be received before finalize the checkpoint, and during this process, it need to snapshot the buffers that are skipped by the barrier, and the final snapshot would compose of both the operator snapshots and the snapshots of the skipped buffers.
Therefore, the checkpointAlignmentTime metric still exists. Best, Yun ------------------Original Mail ------------------ Sender:Kai Fu <zzfu...@gmail.com> Send Date:Mon Apr 5 09:18:39 2021 Recipients:user <user@flink.apache.org> Subject:Questions about checkpointAlignmentTime in unaligned checkpoint Hi team, I'm observing the metrics reporter still emits checkpointAlignmentTime metric in the unaligned checkpoint setting as shown in the figure below. Is it a meaningful in unaligned checkpoint, since I suppose the alignment operation only happens in aligned checkpoint. -- Best regards,- Kai
