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Flink Kuberntes Libraries

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saksham sapra
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Flink Kuberntes Libraries

saksham sapra
Hi ,

and i am able to run flink on UI , but i need to submit a job using : http://localhost:8001/api/v1/namespaces/default/services/flink-jobmanager:webui/proxy/#/submit through POstman, and i have some libraries which in local i can add in libs folder but in this how can i add my libraries so that it works properly.

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Till Rohrmann
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Re: Flink Kuberntes Libraries

Till Rohrmann
HI Saksham,

the easiest approach would probably be to include the required libraries in your user code jar which you submit to the cluster. Using maven's shade plugin should help with this task. Alternatively, you could also create a custom Flink Docker image where you add the required libraries to the FLINK_HOME/libs directory. This would however mean that every job you submit to the Flink cluster would see these libraries in the system class path.

Cheers,
Till

On Wed, Oct 7, 2020 at 2:08 PM saksham sapra <[hidden email]> wrote:
Hi ,

and i am able to run flink on UI , but i need to submit a job using : http://localhost:8001/api/v1/namespaces/default/services/flink-jobmanager:webui/proxy/#/submit through POstman, and i have some libraries which in local i can add in libs folder but in this how can i add my libraries so that it works properly.

image.png
Till Rohrmann
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Re: Flink Kuberntes Libraries

Till Rohrmann
Hi Saksham,

if you want to extend the Flink Docker image you can find here more details [1]. 

If you want to include the library in your user jar, then you have to add the library as a dependency to your pom.xml file and enable the shade plugin for building an uber jar [2].


Cheers,
Till

On Fri, Oct 9, 2020 at 3:22 PM saksham sapra <[hidden email]> wrote:
Thanks Till for helping out,

The way you suggested, is it possible to copy libs which is in D directory to FLINK_HOME/libs. I tried to run a copy command : copy D:/data/libs to FLINK_HOME/libs and it gets copied but i dont how can i check where it gets copied and this libs is taken by flink?


Thanks,
Saksham Sapra

On Wed, Oct 7, 2020 at 9:40 PM Till Rohrmann <[hidden email]> wrote:
HI Saksham,

the easiest approach would probably be to include the required libraries in your user code jar which you submit to the cluster. Using maven's shade plugin should help with this task. Alternatively, you could also create a custom Flink Docker image where you add the required libraries to the FLINK_HOME/libs directory. This would however mean that every job you submit to the Flink cluster would see these libraries in the system class path.

Cheers,
Till

On Wed, Oct 7, 2020 at 2:08 PM saksham sapra <[hidden email]> wrote:
Hi ,

and i am able to run flink on UI , but i need to submit a job using : http://localhost:8001/api/v1/namespaces/default/services/flink-jobmanager:webui/proxy/#/submit through POstman, and i have some libraries which in local i can add in libs folder but in this how can i add my libraries so that it works properly.

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art
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Re: Flink Kuberntes Libraries

art
Hi Till,
Could u tell me how to configure HDFS as statebackend when I deploy flink on k8s?
I try to add the following to flink-conf.yaml

state.backend: rocksdb
state.checkpoints.dir: hdfs://slave2:8020/flink/checkpoints
state.savepoints.dir: hdfs://slave2:8020/flink/savepoints
state.backend.incremental: true

And add flink-shaded-hadoop2-2.8.3-1.8.3.jar to /opt/flink/lib

But It doesn’t work and I got this error logs

Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Could not find a file system implementation for scheme 'hdfs'. The scheme is not directly supported by Flink and no Hadoop file system to support this scheme could be loaded. For a full list of supported file systems, please seehttps://ci.apache.org/projects/flink/flink-docs-stable/ops/filesystems/.

Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Cannot support file system for 'hdfs' via Hadoop, because Hadoop is not in the classpath, or some classes are missing from the classpath

Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.apache.flink.runtime.util.HadoopUtils
On 10/09/2020 22:13, [hidden email] wrote:
Hi Saksham,

if you want to extend the Flink Docker image you can find here more details [1]. 

If you want to include the library in your user jar, then you have to add the library as a dependency to your pom.xml file and enable the shade plugin for building an uber jar [2].


Cheers,
Till

On Fri, Oct 9, 2020 at 3:22 PM saksham sapra <[hidden email]> wrote:
Thanks Till for helping out,

The way you suggested, is it possible to copy libs which is in D directory to FLINK_HOME/libs. I tried to run a copy command : copy D:/data/libs to FLINK_HOME/libs and it gets copied but i dont how can i check where it gets copied and this libs is taken by flink?


Thanks,
Saksham Sapra

On Wed, Oct 7, 2020 at 9:40 PM Till Rohrmann <[hidden email]> wrote:
HI Saksham,

the easiest approach would probably be to include the required libraries in your user code jar which you submit to the cluster. Using maven's shade plugin should help with this task. Alternatively, you could also create a custom Flink Docker image where you add the required libraries to the FLINK_HOME/libs directory. This would however mean that every job you submit to the Flink cluster would see these libraries in the system class path.

Cheers,
Till

On Wed, Oct 7, 2020 at 2:08 PM saksham sapra <[hidden email]> wrote:
Hi ,

and i am able to run flink on UI , but i need to submit a job using : http://localhost:8001/api/v1/namespaces/default/services/flink-jobmanager:webui/proxy/#/submit through POstman, and i have some libraries which in local i can add in libs folder but in this how can i add my libraries so that it works properly.

image.png
Till Rohrmann
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Re: Flink Kuberntes Libraries

Till Rohrmann
Hi Superainbower,

could you share the complete logs with us? They contain which Flink version you are using and also the classpath you are starting the JVM with. Have you tried whether the same problem occurs with the latest Flink version?

Cheers,
Till

On Mon, Oct 12, 2020 at 10:32 AM superainbower <[hidden email]> wrote:
Hi Till,
Could u tell me how to configure HDFS as statebackend when I deploy flink on k8s?
I try to add the following to flink-conf.yaml

state.backend: rocksdb
state.checkpoints.dir: hdfs://slave2:8020/flink/checkpoints
state.savepoints.dir: hdfs://slave2:8020/flink/savepoints
state.backend.incremental: true

And add flink-shaded-hadoop2-2.8.3-1.8.3.jar to /opt/flink/lib

But It doesn’t work and I got this error logs

Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Could not find a file system implementation for scheme 'hdfs'. The scheme is not directly supported by Flink and no Hadoop file system to support this scheme could be loaded. For a full list of supported file systems, please seehttps://ci.apache.org/projects/flink/flink-docs-stable/ops/filesystems/.

Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Cannot support file system for 'hdfs' via Hadoop, because Hadoop is not in the classpath, or some classes are missing from the classpath

Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.apache.flink.runtime.util.HadoopUtils
On 10/09/2020 22:13, [hidden email] wrote:
Hi Saksham,

if you want to extend the Flink Docker image you can find here more details [1]. 

If you want to include the library in your user jar, then you have to add the library as a dependency to your pom.xml file and enable the shade plugin for building an uber jar [2].


Cheers,
Till

On Fri, Oct 9, 2020 at 3:22 PM saksham sapra <[hidden email]> wrote:
Thanks Till for helping out,

The way you suggested, is it possible to copy libs which is in D directory to FLINK_HOME/libs. I tried to run a copy command : copy D:/data/libs to FLINK_HOME/libs and it gets copied but i dont how can i check where it gets copied and this libs is taken by flink?


Thanks,
Saksham Sapra

On Wed, Oct 7, 2020 at 9:40 PM Till Rohrmann <[hidden email]> wrote:
HI Saksham,

the easiest approach would probably be to include the required libraries in your user code jar which you submit to the cluster. Using maven's shade plugin should help with this task. Alternatively, you could also create a custom Flink Docker image where you add the required libraries to the FLINK_HOME/libs directory. This would however mean that every job you submit to the Flink cluster would see these libraries in the system class path.

Cheers,
Till

On Wed, Oct 7, 2020 at 2:08 PM saksham sapra <[hidden email]> wrote:
Hi ,

and i am able to run flink on UI , but i need to submit a job using : http://localhost:8001/api/v1/namespaces/default/services/flink-jobmanager:webui/proxy/#/submit through POstman, and i have some libraries which in local i can add in libs folder but in this how can i add my libraries so that it works properly.

image.png
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