Solved: Node.js server restarts - Page 2

Report Inappropriate Content · 04-26-2015 01:39 PM

Hi.

I'm beginner in node.js.

My task is to have a proxy that mint recur api call every x hours and possibility to manage this schedulers via API.

I create node.js project - (here is GitHub link) that use setInterval function for this, but facing with some problems:

1. APIGEE runs 2 server at same time. here is a log:

[2015-04-08T20:37:18.782Z nodejs/stderr svr.332]***Starting script

[2015-04-08T22:18:53.886Z nodejs/stderr svr.341]***Starting script

so when i call api i never know what exactly server receive call.

i found that both servers use same cache so i use cache "Timers" as global variable.

2. once in 2-3 days APIGEE restarts server even i have active timers, and this clears custom Cache (line 7) and lead to stops emitter.

i don't found in log any errors or another explanation why server restarts.

I try to remove cache clearance at start of server but found that second server also restarts unexpectedly.

Is server restarting is normal for Apigee ?

How can i find the root of problem?

madhans

When you deploy any API in Apigee it is deployed to each Message Processor (a component of Apigee that executes policies). You are probably on the free org so you see 2 servers for the 2 MPs.

All the symptoms you see are correct and is expected. The servers running in MPs are supposed to stateless and hence there is no way to target a particular node server.

Any kind of synchronization you need must be managed externally. So the timer and any other data you need has to be stored in a persistent store and not in cache. The node.js servers can restart due to various reasons that are not under our control. Apigee is horizontally scalable and hence instances can be added or removed without notice. Hence the need for external persistence and synchronization.

Usually the restart events are logged and you will see them in system.log (on-prem instance).

Let know if you have any more questions.

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