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Posted to user@flink.apache.org by John Smith <ja...@gmail.com> on 2019/10/23 21:42:08 UTC
Does operator uid() have to be unique across all jobs?
When setting uid() of an operator does it have to be unique across all jobs
or just unique within a job?
For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer")
in another job?
Re: Does operator uid() have to be unique across all jobs?
Posted by Dian Fu <di...@gmail.com>.
Just adding one more point: Changing the parallelism of the operators may affect the chaining of the operators, which will also affect the generated uid. So the uid of stateful operators should also be set in this case.
> 在 2019年10月25日，上午9:51，Dian Fu <di...@gmail.com> 写道：
>
> Hi Min,
>
> The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
> 1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
> 2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
>
> So for the example you give, I think you don't need to specify the uid for the map and print operator.
>
> [1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state <https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state>
> [2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78 <https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
>> 在 2019年10月24日，下午11:22，min.tan@ubs.com <ma...@ubs.com> 写道：
>>
>> Hi,
>>
>> I have some simple questions on the uid as well.
>>
>> 1) Do we add a uid for every operator e.g. print(), addSink and addSource?
>> 2) For chained operators, do we need to uids for each operator? Or just the last operator?
>> e.g. .map(....).uid("some-id").print().uid("print-id");
>>
>>
>> Regards,
>>
>> Min
>>
>> From: John Smith [mailto:java.dev.mtl@gmail.com <ma...@gmail.com>]
>> Sent: Donnerstag, 24. Oktober 2019 16:32
>> To: Dian Fu
>> Cc: user
>> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>>
>> Ok cool. Thanks
>>
>> BTW this seems a bit cumbersome...
>>
>> .map(....).uid("some-id").name("some-id");
>>
>> On Wed, 23 Oct 2019 at 21:13, Dian Fu <dian0511.fu@gmail.com <ma...@gmail.com>> wrote:
>> Yes, you can use it in another job. The uid needs only to be unique within a job.
>>
>> > 在 2019年10月24日，上午5:42，John Smith <java.dev.mtl@gmail.com <ma...@gmail.com>> 写道：
>> >
>> > When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>> >
>> > For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
>>
>>
>> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
>> The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
>> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
>> For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement <http://www.ubs.com/privacy-statement>
RE: Does operator uid() have to be unique across all
jobs?
Posted by mi...@ubs.com.
Thank you for your reply.
Any tool enables us to inspect (list) statically all the "uid"ed operators or all the operators? for a jar?
Also addSink and addSource are not on the operator list https://ci.apache.org/projects/flink/flink-docs-release-1.9/dev/stream/operators/
But they both have an uid method. Are these two an operator or not?
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 10:24
To: Tan, Min
Cc: John Smith; user@flink.apache.org
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
It means that there is an operator state which has no corresponding operator in the new job. It usually indicates that the uid of a stateful operator has changed.
�� 2019��10��25�գ�����4:12��<mi...@ubs.com>> <mi...@ubs.com>> д����
Thanks for your reply.
Our sources and sinks are connected to Kafka, therefore they are statful.
We did not set uid on them but only name().
The log says
Caused by: java.lang.IllegalStateException: Failed to rollback to checkpoint/savepoint file:/var/flink/data-remote/savepoint-000000-dae014102550<file:///\\var\flink\data-remote\savepoint-000000-dae014102550>. Cannot map checkpoint/savepoint state for operator 484df1f961bd0cff95fd39b290ba9c03 to the new program, because the operator is not available in the new program. If you want to allow to skip this, you can set the --allowNonRestoredState option on the CLI.
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 10:04
To: Tan, Min
Cc: John Smith; user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Hi Min,
It depends on the source/sink implementation. If the source/sink implementation uses state, uid should be set. So you can always set the uid in this case and then you don't need to care about the implementation details of the source/sink you used.
name() doesn't have such functionality.
Regarding to the uid mismatch you encountered, could you share the exception log?
Regards,
Dian
�� 2019��10��25�գ�����3:38��min.tan@ubs.com<ma...@ubs.com> д����
Thank you very much for your helpful response.
Our new production release complains about the an uid mismatch (we use exactly once checkpoints).
I hope I understand your correctly: map and print are certainly stateless, therefore no uid is required. What about addSink and addSoure? Do they need an uid? Or a name() has a similar function?
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 03:52
To: Tan, Min
Cc: John Smith; user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Hi Min,
The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
So for the example you give, I think you don't need to specify the uid for the map and print operator.
[1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state
[2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78<https://protect2.fireeye.com/url?k=c9015cfc22fe1401.c9017582-6f89734a5e8c7c21&u=https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
�� 2019��10��24�գ�����11:22��min.tan@ubs.com<ma...@ubs.com> д����
Hi,
I have some simple questions on the uid as well.
1) Do we add a uid for every operator e.g. print(), addSink and addSource?
2) For chained operators, do we need to uids for each operator? Or just the last operator?
e.g. .map(....).uid("some-id").print().uid("print-id");
Regards,
Min
From: John Smith [mailto:java.dev.mtl@gmail.com]
Sent: Donnerstag, 24. Oktober 2019 16:32
To: Dian Fu
Cc: user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com>> wrote:
Yes, you can use it in another job. The uid needs only to be unique within a job.
> �� 2019��10��24�գ�����5:42��John Smith <ja...@gmail.com>> д����
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
Re: Does operator uid() have to be unique across all jobs?
Posted by Dian Fu <di...@gmail.com>.
It means that there is an operator state which has no corresponding operator in the new job. It usually indicates that the uid of a stateful operator has changed.
> 在 2019年10月25日，下午4:12，<mi...@ubs.com> <mi...@ubs.com> 写道：
>
> Thanks for your reply.
>
> Our sources and sinks are connected to Kafka, therefore they are statful.
>
> We did not set uid on them but only name().
>
> The log says
> Caused by: java.lang.IllegalStateException: Failed to rollback to checkpoint/savepoint file:/var/flink/data-remote/savepoint-000000-dae014102550 <file://///var/flink/data-remote/savepoint-000000-dae014102550>. Cannot map checkpoint/savepoint state for operator 484df1f961bd0cff95fd39b290ba9c03 to the new program, because the operator is not available in the new program. If you want to allow to skip this, you can set the --allowNonRestoredState option on the CLI.
>
> Regards,
>
> Min
>
>
> From: Dian Fu [mailto:dian0511.fu@gmail.com]
> Sent: Freitag, 25. Oktober 2019 10:04
> To: Tan, Min
> Cc: John Smith; user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Hi Min,
>
> It depends on the source/sink implementation. If the source/sink implementation uses state, uid should be set. So you can always set the uid in this case and then you don't need to care about the implementation details of the source/sink you used.
>
> name() doesn't have such functionality.
>
> Regarding to the uid mismatch you encountered, could you share the exception log?
>
> Regards,
> Dian
>
> 在 2019年10月25日，下午3:38，min.tan@ubs.com <ma...@ubs.com> 写道：
>
> Thank you very much for your helpful response.
>
> Our new production release complains about the an uid mismatch (we use exactly once checkpoints).
> I hope I understand your correctly: map and print are certainly stateless, therefore no uid is required. What about addSink and addSoure? Do they need an uid? Or a name() has a similar function?
>
> Regards,
>
> Min
>
> From: Dian Fu [mailto:dian0511.fu@gmail.com <ma...@gmail.com>]
> Sent: Freitag, 25. Oktober 2019 03:52
> To: Tan, Min
> Cc: John Smith; user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Hi Min,
>
> The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
> 1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
> 2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
>
> So for the example you give, I think you don't need to specify the uid for the map and print operator.
>
> [1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state <https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state>
> [2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78 <https://protect2.fireeye.com/url?k=c9015cfc22fe1401.c9017582-6f89734a5e8c7c21&u=https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
>
> 在 2019年10月24日，下午11:22，min.tan@ubs.com <ma...@ubs.com> 写道：
>
> Hi,
>
> I have some simple questions on the uid as well.
>
> 1) Do we add a uid for every operator e.g. print(), addSink and addSource?
> 2) For chained operators, do we need to uids for each operator? Or just the last operator?
> e.g. .map(....).uid("some-id").print().uid("print-id");
>
>
> Regards,
>
> Min
>
> From: John Smith [mailto:java.dev.mtl@gmail.com <ma...@gmail.com>]
> Sent: Donnerstag, 24. Oktober 2019 16:32
> To: Dian Fu
> Cc: user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Ok cool. Thanks
>
> BTW this seems a bit cumbersome...
>
> .map(....).uid("some-id").name("some-id");
>
> On Wed, 23 Oct 2019 at 21:13, Dian Fu <dian0511.fu@gmail.com <ma...@gmail.com>> wrote:
> Yes, you can use it in another job. The uid needs only to be unique within a job.
>
> > 在 2019年10月24日，上午5:42，John Smith <java.dev.mtl@gmail.com <ma...@gmail.com>> 写道：
> >
> > When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
> >
> > For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
>
>
> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
> The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
> For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement <http://www.ubs.com/privacy-statement>
>
>
> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
> The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
> For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement <http://www.ubs.com/privacy-statement>
>
>
> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
> The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
> For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement <http://www.ubs.com/privacy-statement>
RE: Does operator uid() have to be unique across all
jobs?
Posted by mi...@ubs.com.
Thanks for your reply.
Our sources and sinks are connected to Kafka, therefore they are statful.
We did not set uid on them but only name().
The log says
Caused by: java.lang.IllegalStateException: Failed to rollback to checkpoint/savepoint file:/var/flink/data-remote/savepoint-000000-dae014102550<file:///\\var\flink\data-remote\savepoint-000000-dae014102550>. Cannot map checkpoint/savepoint state for operator 484df1f961bd0cff95fd39b290ba9c03 to the new program, because the operator is not available in the new program. If you want to allow to skip this, you can set the --allowNonRestoredState option on the CLI.
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 10:04
To: Tan, Min
Cc: John Smith; user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Hi Min,
It depends on the source/sink implementation. If the source/sink implementation uses state, uid should be set. So you can always set the uid in this case and then you don't need to care about the implementation details of the source/sink you used.
name() doesn't have such functionality.
Regarding to the uid mismatch you encountered, could you share the exception log?
Regards,
Dian
�� 2019��10��25�գ�����3:38��min.tan@ubs.com<ma...@ubs.com> д����
Thank you very much for your helpful response.
Our new production release complains about the an uid mismatch (we use exactly once checkpoints).
I hope I understand your correctly: map and print are certainly stateless, therefore no uid is required. What about addSink and addSoure? Do they need an uid? Or a name() has a similar function?
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 03:52
To: Tan, Min
Cc: John Smith; user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Hi Min,
The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
So for the example you give, I think you don't need to specify the uid for the map and print operator.
[1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state
[2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78<https://protect2.fireeye.com/url?k=c9015cfc22fe1401.c9017582-6f89734a5e8c7c21&u=https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
�� 2019��10��24�գ�����11:22��min.tan@ubs.com<ma...@ubs.com> д����
Hi,
I have some simple questions on the uid as well.
1) Do we add a uid for every operator e.g. print(), addSink and addSource?
2) For chained operators, do we need to uids for each operator? Or just the last operator?
e.g. .map(....).uid("some-id").print().uid("print-id");
Regards,
Min
From: John Smith [mailto:java.dev.mtl@gmail.com]
Sent: Donnerstag, 24. Oktober 2019 16:32
To: Dian Fu
Cc: user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com>> wrote:
Yes, you can use it in another job. The uid needs only to be unique within a job.
> �� 2019��10��24�գ�����5:42��John Smith <ja...@gmail.com>> д����
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
Re: Does operator uid() have to be unique across all jobs?
Posted by Dian Fu <di...@gmail.com>.
Hi Min,
It depends on the source/sink implementation. If the source/sink implementation uses state, uid should be set. So you can always set the uid in this case and then you don't need to care about the implementation details of the source/sink you used.
name() doesn't have such functionality.
Regarding to the uid mismatch you encountered, could you share the exception log?
Regards,
Dian
> 在 2019年10月25日，下午3:38，min.tan@ubs.com 写道：
>
> Thank you very much for your helpful response.
>
> Our new production release complains about the an uid mismatch (we use exactly once checkpoints).
> I hope I understand your correctly: map and print are certainly stateless, therefore no uid is required. What about addSink and addSoure? Do they need an uid? Or a name() has a similar function?
>
> Regards,
>
> Min
>
> From: Dian Fu [mailto:dian0511.fu@gmail.com]
> Sent: Freitag, 25. Oktober 2019 03:52
> To: Tan, Min
> Cc: John Smith; user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Hi Min,
>
> The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
> 1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
> 2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
>
> So for the example you give, I think you don't need to specify the uid for the map and print operator.
>
> [1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state <https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state>
> [2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78 <https://protect2.fireeye.com/url?k=c9015cfc22fe1401.c9017582-6f89734a5e8c7c21&u=https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
>
> 在 2019年10月24日，下午11:22，min.tan@ubs.com <ma...@ubs.com> 写道：
>
> Hi,
>
> I have some simple questions on the uid as well.
>
> 1) Do we add a uid for every operator e.g. print(), addSink and addSource?
> 2) For chained operators, do we need to uids for each operator? Or just the last operator?
> e.g. .map(....).uid("some-id").print().uid("print-id");
>
>
> Regards,
>
> Min
>
> From: John Smith [mailto:java.dev.mtl@gmail.com <ma...@gmail.com>]
> Sent: Donnerstag, 24. Oktober 2019 16:32
> To: Dian Fu
> Cc: user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Ok cool. Thanks
>
> BTW this seems a bit cumbersome...
>
> .map(....).uid("some-id").name("some-id");
>
> On Wed, 23 Oct 2019 at 21:13, Dian Fu <dian0511.fu@gmail.com <ma...@gmail.com>> wrote:
> Yes, you can use it in another job. The uid needs only to be unique within a job.
>
> > 在 2019年10月24日，上午5:42，John Smith <java.dev.mtl@gmail.com <ma...@gmail.com>> 写道：
> >
> > When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
> >
> > For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
>
>
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>
>
> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
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> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
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RE: Does operator uid() have to be unique across all
jobs?
Posted by mi...@ubs.com.
Thank you very much for your helpful response.
Our new production release complains about the an uid mismatch (we use exactly once checkpoints).
I hope I understand your correctly: map and print are certainly stateless, therefore no uid is required. What about addSink and addSoure? Do they need an uid? Or a name() has a similar function?
Regards,
Min
From: Dian Fu [mailto:dian0511.fu@gmail.com]
Sent: Freitag, 25. Oktober 2019 03:52
To: Tan, Min
Cc: John Smith; user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Hi Min,
The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
So for the example you give, I think you don't need to specify the uid for the map and print operator.
[1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state
[2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78<https://protect2.fireeye.com/url?k=c9015cfc22fe1401.c9017582-6f89734a5e8c7c21&u=https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
在 2019年10月24日，下午11:22，min.tan@ubs.com<ma...@ubs.com> 写道：
Hi,
I have some simple questions on the uid as well.
1) Do we add a uid for every operator e.g. print(), addSink and addSource?
2) For chained operators, do we need to uids for each operator? Or just the last operator?
e.g. .map(....).uid("some-id").print().uid("print-id");
Regards,
Min
From: John Smith [mailto:java.dev.mtl@gmail.com]
Sent: Donnerstag, 24. Oktober 2019 16:32
To: Dian Fu
Cc: user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com>> wrote:
Yes, you can use it in another job. The uid needs only to be unique within a job.
> 在 2019年10月24日，上午5:42，John Smith <ja...@gmail.com>> 写道：
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement
Re: Does operator uid() have to be unique across all jobs?
Posted by Dian Fu <di...@gmail.com>.
Hi Min,
The uid is used to matching the operator state stored in the checkpoint/savepoint to an operator[1]. So you only need to specify the uid for stateful operators.
1) If you have not specified the uid for an operator, it will generate a uid for it in a deterministic way[2] for it. The generated uid doesn't change for the same job.
2) However, it's encouraged to set uid for stateful operators to allow for job evolution. The dynamically generated uid is not guaranteed to remain the same if the job has changed, i.e. adding/removing operators in the job graph. If you want to reuse state after job evolution, you need to set the uid explicitly.
So for the example you give, I think you don't need to specify the uid for the map and print operator.
[1] https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state <https://ci.apache.org/projects/flink/flink-docs-master/ops/upgrading.html#matching-operator-state>
[2] https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78 <https://github.com/apache/flink/blob/fd511c345eac31f03b801ff19dbf1f8c86aae760/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphHasherV2.java#L78>
> 在 2019年10月24日，下午11:22，min.tan@ubs.com 写道：
>
> Hi,
>
> I have some simple questions on the uid as well.
>
> 1) Do we add a uid for every operator e.g. print(), addSink and addSource?
> 2) For chained operators, do we need to uids for each operator? Or just the last operator?
> e.g. .map(....).uid("some-id").print().uid("print-id");
>
>
> Regards,
>
> Min
>
> From: John Smith [mailto:java.dev.mtl@gmail.com]
> Sent: Donnerstag, 24. Oktober 2019 16:32
> To: Dian Fu
> Cc: user
> Subject: [External] Re: Does operator uid() have to be unique across all jobs?
>
> Ok cool. Thanks
>
> BTW this seems a bit cumbersome...
>
> .map(....).uid("some-id").name("some-id");
>
> On Wed, 23 Oct 2019 at 21:13, Dian Fu <dian0511.fu@gmail.com <ma...@gmail.com>> wrote:
> Yes, you can use it in another job. The uid needs only to be unique within a job.
>
> > 在 2019年10月24日，上午5:42，John Smith <java.dev.mtl@gmail.com <ma...@gmail.com>> 写道：
> >
> > When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
> >
> > For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
>
>
> E-mails can involve SUBSTANTIAL RISKS, e.g. lack of confidentiality, potential manipulation of contents and/or sender's address, incorrect recipient (misdirection), viruses etc. Based on previous e-mail correspondence with you and/or an agreement reached with you, UBS considers itself authorized to contact you via e-mail. UBS assumes no responsibility for any loss or damage resulting from the use of e-mails.
> The recipient is aware of and accepts the inherent risks of using e-mails, in particular the risk that the banking relationship and confidential information relating thereto are disclosed to third parties.
> UBS reserves the right to retain and monitor all messages. Messages are protected and accessed only in legally justified cases.
> For information on how UBS uses and discloses personal data, how long we retain it, how we keep it secure and your data protection rights, please see our Privacy Notice http://www.ubs.com/privacy-statement <http://www.ubs.com/privacy-statement>
Re: Does operator uid() have to be unique across all jobs?
Posted by Victor Wong <ji...@outlook.com>.
Hi,
“uid” is mainly useful when you upgrade your application. It’s used to match the operator state stored in the savepoint.
As suggested in [1], “it is highly recommended to assign unique IDs to all operators of an application that might be upgraded in the future.”
[1]. https://ci.apache.org/projects/flink/flink-docs-stable/ops/upgrading.html#matching-operator-state
From: "min.tan@ubs.com" <mi...@ubs.com>
Date: Thursday, 24 October 2019 at 11:31 PM
To: "java.dev.mtl@gmail.com" <ja...@gmail.com>, "dian0511.fu@gmail.com" <di...@gmail.com>
Cc: "user@flink.apache.org" <us...@flink.apache.org>
Subject: RE: Does operator uid() have to be unique across all jobs?
Hi,
I have some simple questions on the uid as well.
1. Do we add a uid for every operator e.g. print(), addSink and addSource?
2. For chained operators, do we need to uids for each operator? Or just the last operator?
e.g. .map(....).uid("some-id").print().uid("print-id");
Regards,
Min
From: John Smith [mailto:java.dev.mtl@gmail.com]
Sent: Donnerstag, 24. Oktober 2019 16:32
To: Dian Fu
Cc: user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com>> wrote:
Yes, you can use it in another job. The uid needs only to be unique within a job.
> 在 2019年10月24日，上午5:42，John Smith <ja...@gmail.com>> 写道：
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
RE: Does operator uid() have to be unique across all
jobs?
Posted by mi...@ubs.com.
Hi,
I have some simple questions on the uid as well.
1) Do we add a uid for every operator e.g. print(), addSink and addSource?
2) For chained operators, do we need to uids for each operator? Or just the last operator?
e.g. .map(....).uid("some-id").print().uid("print-id");
Regards,
Min
From: John Smith [mailto:java.dev.mtl@gmail.com]
Sent: Donnerstag, 24. Oktober 2019 16:32
To: Dian Fu
Cc: user
Subject: [External] Re: Does operator uid() have to be unique across all jobs?
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com>> wrote:
Yes, you can use it in another job. The uid needs only to be unique within a job.
> 在 2019年10月24日，上午5:42，John Smith <ja...@gmail.com>> 写道：
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
Re: Does operator uid() have to be unique across all jobs?
Posted by John Smith <ja...@gmail.com>.
Ok cool. Thanks
BTW this seems a bit cumbersome...
.map(....).uid("some-id").name("some-id");
On Wed, 23 Oct 2019 at 21:13, Dian Fu <di...@gmail.com> wrote:
> Yes, you can use it in another job. The uid needs only to be unique within
> a job.
>
> > 在 2019年10月24日，上午5:42，John Smith <ja...@gmail.com> 写道：
> >
> > When setting uid() of an operator does it have to be unique across all
> jobs or just unique within a job?
> >
> > For example can I use
> env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?
>
>
Re: Does operator uid() have to be unique across all jobs?
Posted by Dian Fu <di...@gmail.com>.
Yes, you can use it in another job. The uid needs only to be unique within a job.
> 在 2019年10月24日，上午5:42，John Smith <ja...@gmail.com> 写道：
>
> When setting uid() of an operator does it have to be unique across all jobs or just unique within a job?
>
> For example can I use env.addSource(myKafkaConsumer).uid("kafka-consumer") in another job?