Hey! Is there a way to block workflow triggering when a workflow is still running? Other solution would be, that a workflow can only execute one by one. In my scenario a signal is sent to a webhook trigger. Problem: Sometimes the signal is sent two times in a row and I want to ignore the second si…

Because the readBinary/writeBinary combination is not fast enough I will try my luck with the staticData variable. I combined it with an IF statement (if timestamp diffrence > 20000 = true), hopefully it’s fast enough. If someone also needs that kind of thing here is what I use at the moment (will …

Hey David. Interesting approach using the static data, but checking n8n’s source, the static data gets saved only at the end of the execution. This means that if the signal is fired twice nearly at the same time, you can still have concurrency kicking in and letting two executions happen simultane…

Man, you are right. That’s pitty. I found two other solutions and decided to use the redis solution because the read/calculate/write process takes about 0,022 seconds which is fast enough. The other possible solution I tried is to make a separate workflow which is only responsible for the webhook t…

nice question on incoming http requests. to give you the technical name to what you want is “idempotent” https://docs.mulesoft.com/mule-runtime/4.3/idempotent-message-validator

@David You can have a look at my example workflow here: [image] Multiple webook calls overlaping Questions Btw. if you fear that multiple of that cron workflows could run at the same time. You can use the following workflow to check first if it is running already and only …

Hey David. Yes, using Redis is great. In order to guarantee atomicity it would be even better if we could use the INCR operation. It is still not available on n8n but I just created a PR with this feature. Here: Adds increment operation to Redis by krynble · Pull Request #1745 · n8n-io/n8n · GitHu…

The “Increment” operation for Redis got released with n8n@0.119.0

This simiplied the operation to one node. Thank you

Deny simultaneously workflow execution / Don't execute if workflow is running

Questions

jan May 6, 2021, 3:02am 7

@David You can have a look at my example workflow here:

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Deny simultaneously workflow execution / Don't execute if workflow is running

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