Re: checkpoint always fails

Posted by vino yang on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/checkpoint-always-fails-tp21820p21877.html

Hi Marvin,

Since you are configuring the semantics of Exactly-Once, a task will wait for all the barriers of multiple input channels on the input side when performing checkpoints.

This metric reflects the inconsistent progress of all upstream execution checkpoint tasks, and some tasks may be too slow to cause align to wait a long time. 

There are many reasons why some tasks are handled too slowly, such as keyBy forming data skew.

Thanks, vino.

2018-07-30 12:42 GMT+08:00 Marvin777 <[hidden email]>:

Hi vino,

I found the ' Buffered During Alignment ' term to be very large,  what causes this phenomenon in general?

Marvin777 <[hidden email]> 于2018年7月30日周一 上午10:36写道：

Hi vino,

the issue is FLINK-9945

thanks.

vino yang <[hidden email]> 于2018年7月27日周五 下午4:22写道：

Hi Marvin,

It seems a Checkpoint Bug which triggered your checkpoint timeout. Can you create a issue in JIRA and describe your details (such as Flink version) and attach a complete log?

Thanks, vino.

2018-07-26 19:37 GMT+08:00 Marvin777 <[hidden email]>:

Hi,vino:

Can you give me a hint,  why the checkpoint expires.

What causes this phenomenon in general?

thanks.

Marvin777 <[hidden email]> 于2018年7月26日周四 下午12:22写道：

log

https://issues.apache.org/jira/browse/FLINK-9945   (the exception can not be  repeated every time, but checkpoint failed all the time.)

state Backend

HA configuration

vino yang <[hidden email]> 于2018年7月26日周四 上午10:22写道：

Hi Marvin,

Thanks for reporting this issue.

Can you share more details about the failed checkpoint, such as log, exception stack trace, which statebackend used, HA configuration?

These information can help to trace the issue. 

Thanks, vino.

2018-07-26 10:12 GMT+08:00 Marvin777 <[hidden email]>:

Hi, all:

flink job can run normally, but checkpoint always fails, like this:

checkpoint configuration:

thanks.