????????????????back pressure??????,?????????????????

[??????]

!

flink??back pressure??,
,
example(java/scala)???


??(??+??),
?
!

Re: Checkpoint dir is not cleaned up after cancel the job with monitoring API

[Eleanore Jin]

Thanks a lot for the confirmation.

Eleanore

On Fri, Oct 2, 2020 at 2:42 AM Chesnay Schepler  wrote:

> Yes, the patch call only triggers the cancellation.
> You can check whether it is complete by polling the job status via
> jobs/ and checking whether state is CANCELED.
>
> On 9/27/2020 7:02 PM, Eleanore Jin wrote:
>
> I have noticed this: if I have Thread.sleep(1500); after the patch call
> returned 202, then the directory gets cleaned up, in the meanwhile, it
> shows the job-manager pod is in completed state before getting terminated:
> see screenshot: https://ibb.co/3F8HsvG
>
> So the patch call is async to terminate the job? Is there a way to check
> if cancel is completed? So that the stop tm and jm can be called afterwards?
>
> Thanks a lot!
> Eleanore
>
>
> On Sun, Sep 27, 2020 at 9:37 AM Eleanore Jin 
> wrote:
>
>> Hi Congxian,
>> I am making rest call to get the checkpoint config: curl -X GET \
>>
>> http://localhost:8081/jobs/d2c91a44f23efa2b6a0a89b9f1ca5a3d/checkpoints/config
>>
>> and here is the response:
>> {
>> "mode": "at_least_once",
>> "interval": 3000,
>> "timeout": 1,
>> "min_pause": 1000,
>> "max_concurrent": 1,
>> "externalization": {
>> "enabled": false,
>> "delete_on_cancellation": true
>> },
>> "state_backend": "FsStateBackend"
>> }
>>
>> I uploaded a screenshot of how azure blob storage looks like after the
>> cancel call : https://ibb.co/vY64pMZ
>>
>> Thanks a lot!
>> Eleanore
>>
>> On Sat, Sep 26, 2020 at 11:23 PM Congxian Qiu 
>> wrote:
>>
>>> Hi Eleanore
>>>
>>> What the `CheckpointRetentionPolicy`[1] did you set for your job? if
>>> `ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION` is set, then the
>>> checkpoint will be kept when canceling a job.
>>>
>>> PS the image did not show
>>>
>>> [1]
>>> https://ci.apache.org/projects/flink/flink-docs-stable/ops/state/checkpoints.html#retained-checkpoints
>>> Best,
>>> Congxian
>>>
>>>
>>> Eleanore Jin  于2020年9月27日周日 下午1:50写道：
>>>
 Hi experts,

 I am running flink 1.10.2 on kubernetes as per job cluster. Checkpoint
 is enabled, with interval 3s, minimumPause 1s, timeout 10s. I'm
 using FsStateBackend, snapshots are persisted to azure blob storage
 (Microsoft cloud storage service).

 Checkpointed state is just source kafka topic offsets, the flink job is
 stateless as it does filter/json transformation.

 The way I am trying to stop the flink job is via monitoring rest api
 mentioned in doc
 

 e.g.
 curl -X PATCH \
   '
 http://localhost:8081/jobs/3c00535c182a3a00258e2f57bc11fb1a?mode=cancel'
 \
   -H 'Content-Type: application/json' \
   -d '{}'

 This call returned successfully with statusCode 202, then I stopped the
 task manager pods and job manager pod.

 According to the doc, the checkpoint should be cleaned up after the job
 is stopped/cancelled.
 What I have observed is, the checkpoint dir is not cleaned up, can you
 please shield some lights on what I did wrong?

 Below shows the checkpoint dir for a cancelled flink job.
 [image: image.png]

 Thanks!
 Eleanore


>

大佬们，有遇到Flink cdc 同步MySQL中的数据，MySQL中的数据有变化，Flink SQL中的表没有实时同步到变化，是什么原因呢？

[chegg_work]

Flink对IoTDB的支持

[milan183sansiro]

请问社区有无对IoTDB的source或sink的支持计划

Re: Checkpoint dir is not cleaned up after cancel the job with monitoring API

[Chesnay Schepler]

Yes, the patch call only triggers the cancellation.
You can check whether it is complete by polling the job status via 
jobs/ and checking whether state is CANCELED.


On 9/27/2020 7:02 PM, Eleanore Jin wrote:
I have noticed this: if I have Thread.sleep(1500); after the patch 
call returned 202, then the directory gets cleaned up, in the 
meanwhile, it shows the job-manager pod is in completed state before 
getting terminated: see screenshot: https://ibb.co/3F8HsvG


So the patch call is async to terminate the job? Is there a way to 
check if cancel is completed? So that the stop tm and jm can be called 
afterwards?


Thanks a lot!
Eleanore


On Sun, Sep 27, 2020 at 9:37 AM Eleanore Jin > wrote:


Hi Congxian,
I am making rest call to get the checkpoint config: curl -X GET \

http://localhost:8081/jobs/d2c91a44f23efa2b6a0a89b9f1ca5a3d/checkpoints/config


and here is the response:
{
    "mode": "at_least_once",
    "interval": 3000,
    "timeout": 1,
    "min_pause": 1000,
    "max_concurrent": 1,
    "externalization": {
        "enabled": false,
        "delete_on_cancellation": true
    },
    "state_backend": "FsStateBackend"
}

I uploaded a screenshot of how azure blob storage looks like after
the cancel call : https://ibb.co/vY64pMZ

Thanks a lot!
Eleanore

On Sat, Sep 26, 2020 at 11:23 PM Congxian Qiu
mailto:qcx978132...@gmail.com>> wrote:

Hi Eleanore
    What the `CheckpointRetentionPolicy`[1] did you set for
your job? if
`ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION` is set,
then the checkpoint will be kept when canceling a job.

PS the image did not show

[1]

https://ci.apache.org/projects/flink/flink-docs-stable/ops/state/checkpoints.html#retained-checkpoints
Best,
Congxian


Eleanore Jin mailto:eleanore@gmail.com>> 于2020年9月27日周日
下午1:50写道：

Hi experts,

I am running flink 1.10.2 on kubernetes as per job
cluster. Checkpoint is enabled, with interval 3s,
minimumPause 1s, timeout 10s. I'm using FsStateBackend,
snapshots are persisted to azure blob storage (Microsoft
cloud storage service).

Checkpointed state is just source kafka topic offsets, the
flink job is stateless as it does filter/json transformation.

The way I am trying to stop the flink job is via
monitoring rest api mentioned in doc



e.g.
curl -X PATCH \
 

'http://localhost:8081/jobs/3c00535c182a3a00258e2f57bc11fb1a?mode=cancel'
\
  -H 'Content-Type: application/json' \
  -d '{}'

This call returned successfully with statusCode 202, then
I stopped the task manager pods and job manager pod.

According to the doc, the checkpoint should be cleaned up
after the job is stopped/cancelled.
What I have observed is, the checkpoint dir is not cleaned
up, can you please shield some lights on what I did wrong?

Below shows the checkpoint dir for a cancelled flink job.
image.png

Thanks!
Eleanore