sekrett
I am reading the book Programming Phoenix 1.4. There is a task, we want to connect Wolfram API, and if it does not respond within 10 second, kill the process:
backends
|> Enum.map(&async_query(&1, query, opts))
|> Task.yield_many(timeout)
|> Enum.map(fn {task, res} -> res || Task.shutdown(task, :brutal_kill) end)
But wouldn’t it be easier to specify a timeout for :httpc and let the process terminate normally? Maybe there is a best practice for killing such a process or it was made for illustration purposes?
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whatyouhide
Yeah in general if you can guarantee that the code you execute inside a task finishes within a given timeframe, then you can likely get rid of the
Task.shutdown/2. On the other hand, it can also be seen as a “safety measure”, making sure that you do actually terminate potentially-stuck processes, avoiding leaks.