Question in the tutorial

[Karthik Guru]

Hey Flink team,

Novice here. I just about started using Flink. I have a slight issue with respect to the following instruction in the tutorial.

https://ci.apache.org/projects/flink/flink-docs-release-1.8/tutorials/local_setup.html

In this, when I try to 'Start a Local Flink Cluster' and then connect to local host, I am not getting an update on the task manager. It still shows 0 for all the three categories. Could you please help?

Thanks for your time

Karthik

[Xintong Song]

Hi Karthik,

I think more information is needed for diagnosing the problem, and I would suggest you to do the followings:

- Check whether the task managers are configured in the file 'conf/slaves'.

  - If configured, you should see some hosts in the file, each for one task manager.

- Check whether the task managers are running, by execute the command 'ps -ef | grep TaskManagerRunner'.

  - If there are task managers running, you should be able to see the corresponding processes.

- Checks jobmanager / taskmanager logs to find out why the task managers are not started, or started, but not find by the cluster.

  - You can find the logs in 'log/flink-*-standalonesession-*.log'.

  - If you cannot find the problem from the logs, you can also post them in this ML for help.

On Fri, Jul 12, 2019 at 1:57 AM Karthik Guru <[hidden email]> wrote:

Hey Flink team,

Novice here. I just about started using Flink. I have a slight issue with respect to the following instruction in the tutorial.

https://ci.apache.org/projects/flink/flink-docs-release-1.8/tutorials/local_setup.html

In this, when I try to 'Start a Local Flink Cluster' and then connect to local host, I am not getting an update on the task manager. It still shows 0 for all the three categories. Could you please help?

Thanks for your time

Karthik

[Xintong Song]

It seems to me that your task manager is started and then failed before registering to the cluster. I think we need the entire log file instead of the result of tail command. Could you just clear the log dir, start the cluster again and wait for a little while (1-2 min should be enough), and post all the new generated files under the log dir here?

On Fri, Jul 12, 2019 at 2:25 PM Karthik Guru <[hidden email]> wrote:

Hello Xintong

Thanks for your reply.

1)I have attached screenshots of the logs directory (Screenshot 1,2)

2) In conf/slaves, all I can see is the word 'localhost' written in it. I am not sure if that suffices

3) Screenshot 3 has the result of the command for checking whether task managers are running. I am not sure if that is the correct response.

4) Screenshot 4 has all the logs. I am not too sure how to diagnose the problem. I have also attached the localhost 'overview' screenshot. (Screenshot 5) 

On Fri, Jul 12, 2019 at 8:42 AM Xintong Song <[hidden email]> wrote:

Hi Karthik,

I think more information is needed for diagnosing the problem, and I would suggest you to do the followings:

- Check whether the task managers are configured in the file 'conf/slaves'.

  - If configured, you should see some hosts in the file, each for one task manager.

- Check whether the task managers are running, by execute the command 'ps -ef | grep TaskManagerRunner'.

  - If there are task managers running, you should be able to see the corresponding processes.

- Checks jobmanager / taskmanager logs to find out why the task managers are not started, or started, but not find by the cluster.

  - You can find the logs in 'log/flink-*-standalonesession-*.log'.

  - If you cannot find the problem from the logs, you can also post them in this ML for help.

On Fri, Jul 12, 2019 at 1:57 AM Karthik Guru <[hidden email]> wrote:

Hey Flink team,

Novice here. I just about started using Flink. I have a slight issue with respect to the following instruction in the tutorial.

https://ci.apache.org/projects/flink/flink-docs-release-1.8/tutorials/local_setup.html

In this, when I try to 'Start a Local Flink Cluster' and then connect to local host, I am not getting an update on the task manager. It still shows 0 for all the three categories. Could you please help?

Thanks for your time

Karthik