kunna

Concurrent Data Processing in Elixir: JobSupervisor does not go down (page 54)

After finishing Chapter 2, Long-Running Processes Using GenServer, I was able to successfully run the code. but if I see the process observer, I can see the JobSupervisor processes still alive. Is this the expected behavior? If I have created 100,000 jobs, there will be 100,000 active supervisors.

This is how my supervision tree looks like when triggered 3 jobs. 2 jobs are finished.

[Elixir.Jobber.JobRunner] – [<0.176.6>]
– [<0.191.0>]
– [<0.194.0>] — [<0.223.0>]

4 comments

#question /book-concurrent-data-processing-in-elixir

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2021-03-21 16:12:43 UTC

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svilen

Author of Concurrent Data Processing in Elixir

I decided to include a short section at the end of Chapter 2, which talks about count_children/1 and which_children/1. I think they’re quite useful so should be a welcome addition. I’ll also add a clarification on the idle supervisor processes. Thanks again for your feedback @kunna!

Post #3

svilen

Author of Concurrent Data Processing in Elixir

No problem at all @kunna.

If a child is being restarted, then which_children/1 will return :restarting for the second element in the tuple, so you can use that in combination with count_children/1. Please see the documentation for which_children/1.

Yes, you can make a JobTerminator GenServer that does that.

Post #5

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