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Cluster Lock

Sa Kan Nov 02, 2017

I have modified my plugin to support Jira Data Center. 

I use cluster lock to restrict one of my processes to run only in a single node at a time. 

Question: In a cluster, we know that if one node is down then the process is transferred to another node. But when we use cluster locks we restrict one process into one node. In such cases, if that particular node is down, then is the load balancer switch the process to other node?

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Aron Gombas [Midori] Community Leader Nov 03, 2017

I'd think that if the lock was acquired by node "A" and "A" goes down, the lock simply gets released (either by timing out or the cluster orchestration mechanism recognizes that "A" is not available anymore). The process will not be moved to some other node, at least I don't think so.

Instead, this is your responsibility to start the process again either manually or via the CRON scheduler.

Sa Kan Nov 07, 2017

Thanks for the reply Aron. I also thought that it will stop and never continues. In such cases, we lose all the capabilities in a clustered architecture right? .. Anyway I will do my testing and post the answer here.

Aron Gombas [Midori] Community Leader Nov 07, 2017

If this is a critical problem in your use case, I'd do this: every job execution should persist (to the database or even to a cluster-wide lock if it doesn't need to be long-living) its start time, its end time or at least some flag at completion.

That way you could periodically check if there was a job that got started, but not finished, and then re-try.

Simple and cluster-safe, because you are using cluster-aware components (database or shared cache).

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Sa Kan Nov 08, 2017

Yeah.. Got it. So, the Cluster Lock works only in a single host. SO, if that breaks, the process will stop. Thanks Aron.

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