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Each `map()` and `reduce()` is essentially independent of the others too, right? So an error thrown in one wouldn't stop everything would it?

ITs independent but its in same thread. If an error is not solved, all thread is die

An error on a single invocation of `map` or `reduce` will *only* stop that specific invocation. That same processor (thread) will continue to process further iterations of `map` or `reduce`

e.g. If you are only using one Processor for your script, and an error occurs on invocation #10 of `map`, #11 will still continue in due course

You can optionally set the `exitOnError` setting if you *do* want the first error encountered to completely halt the script. See `Help:Configuration Options for Handling Map/Reduce Interruptions`

I definitely don't want to stop the whole script on a single error. Problem is, I don't even know if an error is causing it to stop at all

you should log errors in the summary stage

I think some errors will appear there that are not catch-able

<@UAS0EU3RD> add a try/catch in all your stages, input, map, reduce, summary to catch the error, by default is an error happens if a map stage, nothing is displaying on the logs, you must do it

<@UAS0EU3RD>, those functions can help you in stages and do not break your thread.

<@UP1NL06M8> do you have those functions just log individual errors, or try to accumulate them &amp; log once?

accumulate, I does not use to log once cause this schedule I use one time per day

handleErrorIfAny's function is called in Summarize, but you can use in MAP or REDUCE

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For exactly this reason, I've recently added this function to my Map/Reduce template: