Re: apache flink: Why checkpoint coordinator takes long time to get completion

Posted by Xiangyu Su on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/apache-flink-Why-checkpoint-coordinator-takes-long-time-to-get-completion-tp28856p28862.html

Ok, thanks. 

and this time-consuming until now always happens after 3rd checkpointing, and this unexpected  time-consuming was always consistent (~ 4 min by under 4G/min incoming traffic). 

On Fri, 19 Jul 2019 at 11:06, Biao Liu <[hidden email]> wrote:

Hi Xiangyu,

Just took a glance at the relevant codes. There is a gap between calculating the duration and logging it out. I guess the checkpoint 4 is finished in 1 minute, but there is an unexpected time-consuming operation during that time. But I can't tell which part it is.

Xiangyu Su <[hidden email]> 于2019年7月19日周五 下午4:14写道：

Dear flink community,

We are POC flink(1.8) to process data in real time, and using global checkpointing(S3) and local checkpointing(EBS), deploy cluster on EKS. Our application is consuming data from Kinesis.

For my test e.g I am using checkpointing interval 5min. and minimum pause 2min.

The issue what we saw is: It seems like flink checkpointing process would be idle for 3-4 min, before job manager get complete notification.

here is some logging from job manager:

2019-07-10 11:59:03,893 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator     - Triggering checkpoint 4 @ 1562759941082 for job e7a97014f5799458f1c656135712813d.
2019-07-10 12:05:01,836 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator     - Completed checkpoint 4 for job e7a97014f5799458f1c656135712813d (22387207650 bytes in 58645 ms).

As my understanding the logging above, the completedCheckpoint(CheckpointCoordinator) object has been completed in 58645 ms, but the whole checkpointing process took ~ 6min.

This logging is for 4th checkpointing, But the first 3 checkpointing were finished on time.

Could you please tell me, why flink checkpointing in my test was starting "idle" for few minutes after 3 checkpointing?

Best Regards

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