Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Shannon Carey]

Till,

Unfortunately, System.getenv() doesn't contain the expected variable even 
within the UDFs, but thanks for the info!

In the Yarn setting, "the client" would be either:

  1.  the bin/flink executable (with configuration based on where it's run 
from… which might not be the same as the destination Flink cluster) OR
  2.  the web UI… the job planning runs in the existing JVM of the web UI? That 
runs as part of the Job Manager, right? This is the primary method by which we 
launch jobs, currently.

Is that right?

I will try out "env.java.opts" to see if that has any effect.

-Shannon

From: Till Rohrmann <till.rohrm...@gmail.com<mailto:till.rohrm...@gmail.com>>
Date: Tuesday, December 13, 2016 at 4:34 AM
To: <user@flink.apache.org<mailto:user@flink.apache.org>>
Cc: Chesnay Schepler <ches...@apache.org<mailto:ches...@apache.org>>
Subject: Re: How to retrieve values from yarn.taskmanager.env in a Job?

Hi Shannon,

the job graph generation does not run in the task manager but on the client. 
The job graph is then submitted to the JobManager which then will deploy the 
individual tasks to the TaskManager. Thus, when generating the job graph the 
task manager environment variables are not accessible.

Thus, you are only able to access these environment variables from within your 
UDFs.

What you could do is to union all configuration objects and then reading only 
those entries relevant for a specific environment on the task manager, e.g. 
open method of a RichFunction.

Cheers,
Till

On Mon, Dec 12, 2016 at 7:12 PM, Shannon Carey 
<sca...@expedia.com<mailto:sca...@expedia.com>> wrote:
Hi Chesnay,

Since that configuration option is supposed to apply the environment variables 
to the task managers, I figured it would definitely be available within the 
stream operators. I'm not sure whether the job plan runs within a task manager 
or not, but hopefully it does?

In my particular code, I want to get the name of the environment in order to 
read the correct configuration file(s) so that properly populated config 
objects can be passed to various operators. Therefore, it would be sufficient 
for the job plan execution to have access to the environment. All the operators 
are capable of persisting any necessary configuration through serialization.

It really can work either way, but I think it'd be easiest if it was available 
everywhere. If it's only available during job planning then you have to make 
sure to serialize it everywhere you need it, and if it's only available during 
operator execution then it's less straightforward to do central configuration 
work. Either way it's lying in wait for a programmer to forget where it's 
accessible vs. not.

-Shannon

From: Chesnay Schepler <ches...@apache.org<mailto:ches...@apache.org>>
Date: Monday, December 12, 2016 at 7:36 AM
To: <user@flink.apache.org<mailto:user@flink.apache.org>>
Subject: Re: How to retrieve values from yarn.taskmanager.env in a Job?

Hello,

can you clarify one small thing for me: Do you want to access this parameter 
when you define the plan
(aka when you call methods on the StreamExecutionEnvironment or DataStream 
instances)
or from within your functions/operators?

Regards,
Chesnay Schepler


On 12.12.2016 14:21, Till Rohrmann wrote:

Hi Shannon,

have you tried accessing the environment variables via System.getenv()? This 
should give you a map of string-string key value pairs where the key is the 
environment variable name.

If your values are not set in the returned map, then this indicates a bug in 
Flink and it would be great if you could open a JIRA issue.

Cheers,
Till

​

On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey 
<sca...@expedia.com<mailto:sca...@expedia.com>> wrote:
This thread 
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html
 describes the impetus for the addition of yarn.taskmanager.env.

I have configured a value within yarn.taskmanager.env, and I see it appearing 
in the Flink web UI in the list underneath Job Manager -> Configuration. 
However, I can't figure out how to retrieve the value from within a Flink job. 
It doesn't appear in the environment, the system properties, or my 
ParameterTool instance, and I can't figure out how I would get to it via the 
StreamExecutionEnvironment. Can anyone point me in the right direction?

All I want to do is inform my Flink jobs which environment they're running on, 
so that programmers don't have to specify the environment as a job parameter 
every time they run it. I also see that there is a "env.java.opts" 
configuration… does that work in YARN apps (would my jobs be able to see it?)

Thanks!
Shannon

Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Till Rohrmann]

Hi Shannon,

the job graph generation does not run in the task manager but on the
client. The job graph is then submitted to the JobManager which then will
deploy the individual tasks to the TaskManager. Thus, when generating the
job graph the task manager environment variables are not accessible.

Thus, you are only able to access these environment variables from within
your UDFs.

What you could do is to union all configuration objects and then reading
only those entries relevant for a specific environment on the task manager,
e.g. open method of a RichFunction.

Cheers,
Till

On Mon, Dec 12, 2016 at 7:12 PM, Shannon Carey <sca...@expedia.com> wrote:

> Hi Chesnay,
>
> Since that configuration option is supposed to apply the environment
> variables to the task managers, I figured it would definitely be available
> within the stream operators. I'm not sure whether the job plan runs within
> a task manager or not, but hopefully it does?
>
> In my particular code, I want to get the name of the environment in order
> to read the correct configuration file(s) so that properly populated config
> objects can be passed to various operators. Therefore, it would be
> sufficient for the job plan execution to have access to the environment.
> All the operators are capable of persisting any necessary configuration
> through serialization.
>
> It really can work either way, but I think it'd be easiest if it was
> available everywhere. If it's only available during job planning then you
> have to make sure to serialize it everywhere you need it, and if it's only
> available during operator execution then it's less straightforward to do
> central configuration work. Either way it's lying in wait for a programmer
> to forget where it's accessible vs. not.
>
> -Shannon
>
> From: Chesnay Schepler <ches...@apache.org>
> Date: Monday, December 12, 2016 at 7:36 AM
> To: <user@flink.apache.org>
> Subject: Re: How to retrieve values from yarn.taskmanager.env in a Job?
>
> Hello,
>
> can you clarify one small thing for me: Do you want to access this
> parameter when you define the plan
> (aka when you call methods on the StreamExecutionEnvironment or DataStream
> instances)
> or from within your functions/operators?
>
> Regards,
> Chesnay Schepler
>
>
> On 12.12.2016 14:21, Till Rohrmann wrote:
>
> Hi Shannon,
>
> have you tried accessing the environment variables via System.getenv()?
> This should give you a map of string-string key value pairs where the key
> is the environment variable name.
>
> If your values are not set in the returned map, then this indicates a bug
> in Flink and it would be great if you could open a JIRA issue.
>
> Cheers,
> Till
> ​
>
> On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey <sca...@expedia.com> wrote:
>
>> This thread http://apache-flink-user-mailing-list-archive.2336050
>> .n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html 
>> describes
>> the impetus for the addition of yarn.taskmanager.env.
>>
>> I have configured a value within yarn.taskmanager.env, and I see it
>> appearing in the Flink web UI in the list underneath Job Manager ->
>> Configuration. However, I can't figure out how to retrieve the value from
>> within a Flink job. It doesn't appear in the environment, the system
>> properties, or my ParameterTool instance, and I can't figure out how I
>> would get to it via the StreamExecutionEnvironment. Can anyone point me in
>> the right direction?
>>
>> All I want to do is inform my Flink jobs which environment they're
>> running on, so that programmers don't have to specify the environment as a
>> job parameter every time they run it. I also see that there is a
>> "env.java.opts" configuration… does that work in YARN apps (would my jobs
>> be able to see it?)
>>
>> Thanks!
>> Shannon
>>
>
>
>

Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Shannon Carey]

Hi Till,

Yes, System.getenv() was the first thing I tried. It'd be great if someone else 
can reproduce the issue, but for now I'll submit a JIRA with the assumption 
that it really is not working right. 
https://issues.apache.org/jira/browse/FLINK-5322

-Shannon

From: Till Rohrmann <trohrm...@apache.org<mailto:trohrm...@apache.org>>
Date: Monday, December 12, 2016 at 7:21 AM
To: <user@flink.apache.org<mailto:user@flink.apache.org>>
Subject: Re: How to retrieve values from yarn.taskmanager.env in a Job?


Hi Shannon,

have you tried accessing the environment variables via System.getenv()? This 
should give you a map of string-string key value pairs where the key is the 
environment variable name.

If your values are not set in the returned map, then this indicates a bug in 
Flink and it would be great if you could open a JIRA issue.

Cheers,
Till

​

On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey 
<sca...@expedia.com<mailto:sca...@expedia.com>> wrote:
This thread 
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html
 describes the impetus for the addition of yarn.taskmanager.env.

I have configured a value within yarn.taskmanager.env, and I see it appearing 
in the Flink web UI in the list underneath Job Manager -> Configuration. 
However, I can't figure out how to retrieve the value from within a Flink job. 
It doesn't appear in the environment, the system properties, or my 
ParameterTool instance, and I can't figure out how I would get to it via the 
StreamExecutionEnvironment. Can anyone point me in the right direction?

All I want to do is inform my Flink jobs which environment they're running on, 
so that programmers don't have to specify the environment as a job parameter 
every time they run it. I also see that there is a "env.java.opts" 
configuration… does that work in YARN apps (would my jobs be able to see it?)

Thanks!
Shannon

Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Shannon Carey]

Hi Chesnay,

Since that configuration option is supposed to apply the environment variables 
to the task managers, I figured it would definitely be available within the 
stream operators. I'm not sure whether the job plan runs within a task manager 
or not, but hopefully it does?

In my particular code, I want to get the name of the environment in order to 
read the correct configuration file(s) so that properly populated config 
objects can be passed to various operators. Therefore, it would be sufficient 
for the job plan execution to have access to the environment. All the operators 
are capable of persisting any necessary configuration through serialization.

It really can work either way, but I think it'd be easiest if it was available 
everywhere. If it's only available during job planning then you have to make 
sure to serialize it everywhere you need it, and if it's only available during 
operator execution then it's less straightforward to do central configuration 
work. Either way it's lying in wait for a programmer to forget where it's 
accessible vs. not.

-Shannon

From: Chesnay Schepler <ches...@apache.org<mailto:ches...@apache.org>>
Date: Monday, December 12, 2016 at 7:36 AM
To: <user@flink.apache.org<mailto:user@flink.apache.org>>
Subject: Re: How to retrieve values from yarn.taskmanager.env in a Job?

Hello,

can you clarify one small thing for me: Do you want to access this parameter 
when you define the plan
(aka when you call methods on the StreamExecutionEnvironment or DataStream 
instances)
or from within your functions/operators?

Regards,
Chesnay Schepler


On 12.12.2016 14:21, Till Rohrmann wrote:

Hi Shannon,

have you tried accessing the environment variables via System.getenv()? This 
should give you a map of string-string key value pairs where the key is the 
environment variable name.

If your values are not set in the returned map, then this indicates a bug in 
Flink and it would be great if you could open a JIRA issue.

Cheers,
Till

​

On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey 
<sca...@expedia.com<mailto:sca...@expedia.com>> wrote:
This thread 
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html
 describes the impetus for the addition of yarn.taskmanager.env.

I have configured a value within yarn.taskmanager.env, and I see it appearing 
in the Flink web UI in the list underneath Job Manager -> Configuration. 
However, I can't figure out how to retrieve the value from within a Flink job. 
It doesn't appear in the environment, the system properties, or my 
ParameterTool instance, and I can't figure out how I would get to it via the 
StreamExecutionEnvironment. Can anyone point me in the right direction?

All I want to do is inform my Flink jobs which environment they're running on, 
so that programmers don't have to specify the environment as a job parameter 
every time they run it. I also see that there is a "env.java.opts" 
configuration… does that work in YARN apps (would my jobs be able to see it?)

Thanks!
Shannon

Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Chesnay Schepler]

Hello,

can you clarify one small thing for me: Do you want to access this 
parameter when you define the plan
(aka when you call methods on the StreamExecutionEnvironment or 
DataStream instances)

or from within your functions/operators?

Regards,
Chesnay Schepler


On 12.12.2016 14:21, Till Rohrmann wrote:


Hi Shannon,

have you tried accessing the environment variables via 
|System.getenv()|? This should give you a map of string-string key 
value pairs where the key is the environment variable name.


If your values are not set in the returned map, then this indicates a 
bug in Flink and it would be great if you could open a JIRA issue.


Cheers,
Till

​

On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey > wrote:


This thread

http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html


describes the impetus for the addition of yarn.taskmanager.env.

I have configured a value within yarn.taskmanager.env, and I see
it appearing in the Flink web UI in the list underneath Job
Manager -> Configuration. However, I can't figure out how to
retrieve the value from within a Flink job. It doesn't appear in
the environment, the system properties, or my ParameterTool
instance, and I can't figure out how I would get to it via the
StreamExecutionEnvironment. Can anyone point me in the right
direction?

All I want to do is inform my Flink jobs which environment they're
running on, so that programmers don't have to specify the
environment as a job parameter every time they run it. I also see
that there is a "env.java.opts" configuration… does that work in
YARN apps (would my jobs be able to see it?)

Thanks!
Shannon

Re: How to retrieve values from yarn.taskmanager.env in a Job?

[Till Rohrmann]

Hi Shannon,

have you tried accessing the environment variables via System.getenv()?
This should give you a map of string-string key value pairs where the key
is the environment variable name.

If your values are not set in the returned map, then this indicates a bug
in Flink and it would be great if you could open a JIRA issue.

Cheers,
Till
​

On Fri, Dec 9, 2016 at 7:33 PM, Shannon Carey  wrote:

> This thread http://apache-flink-user-mailing-list-archive.
> 2336050.n4.nabble.com/passing-environment-variables-to-
> flink-program-td3337.html describes the impetus for the addition
> of yarn.taskmanager.env.
>
> I have configured a value within yarn.taskmanager.env, and I see it
> appearing in the Flink web UI in the list underneath Job Manager ->
> Configuration. However, I can't figure out how to retrieve the value from
> within a Flink job. It doesn't appear in the environment, the system
> properties, or my ParameterTool instance, and I can't figure out how I
> would get to it via the StreamExecutionEnvironment. Can anyone point me in
> the right direction?
>
> All I want to do is inform my Flink jobs which environment they're running
> on, so that programmers don't have to specify the environment as a job
> parameter every time they run it. I also see that there is a
> "env.java.opts" configuration… does that work in YARN apps (would my jobs
> be able to see it?)
>
> Thanks!
> Shannon
>

How to retrieve values from yarn.taskmanager.env in a Job?

[Shannon Carey]

This thread 
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/passing-environment-variables-to-flink-program-td3337.html
 describes the impetus for the addition of yarn.taskmanager.env.

I have configured a value within yarn.taskmanager.env, and I see it appearing 
in the Flink web UI in the list underneath Job Manager -> Configuration. 
However, I can't figure out how to retrieve the value from within a Flink job. 
It doesn't appear in the environment, the system properties, or my 
ParameterTool instance, and I can't figure out how I would get to it via the 
StreamExecutionEnvironment. Can anyone point me in the right direction?

All I want to do is inform my Flink jobs which environment they're running on, 
so that programmers don't have to specify the environment as a job parameter 
every time they run it. I also see that there is a "env.java.opts" 
configuration… does that work in YARN apps (would my jobs be able to see it?)

Thanks!
Shannon