Some values in result list are just NULL about pbmcapply HOT 4 CLOSED

Hi Martin,

Is it possible to provide me with a piece of code that would trigger this behaviour? And on what platform?

Thanks,
Kevin

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I have tried it during the past two weeks and I also found the problem with parallel::mclapply. The thing seems to happen most of the time (if not always) when using the boot packages which works with the random number generator. Perhaps that leads to a race condition.

If I manage to come up with a reproducible example, I will come back to this issue, otherwise I would consider it just invalid.

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Not sure if this was ever figured out, but I was having the same issue today.

Oddly, it only occurred when running my script in non-interactive mode - which it looks like just passes the computation to 'mclapply'. However, if I just substituted mclapply in my code, then it worked just fine (no NULLs).

This all occurred using version 1.3.0 of the package and was fixed when I upgraded to 1.3.1. No idea why the changes between those versions would have caused/fixed this, but I just wanted to mention it and the details around this in case it shows up for other people.

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Thanks for keeping us updated.

I am not sure how it was solved either since I didn't have code that will reproduce this bug. Maybe it was fixed because I slightly changed how non-vector objects are handled. Or it could be that the maintainers of the parallel package fixed it recently.

Anyway, I am glad it's fixed 😄

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