topic Re: ArcGIS Online hosted feature layer replica limit in ArcGIS Online Questions

ArcGIS Online hosted feature layer replica limit

JohnMarino — Wed, 04 May 2022 20:59:37 GMT

Is there a limit to the number of replicas a feature layer hosted on ArcGIS Online can have?

For context, we host a feature layer in ArcGIS Online which is shared with approximately 100 users. This layer is primarily used in a map (configured for offline use) which is used in Collector/Field Maps.

Over time, these users have created many offline areas in Field Maps, leading to nearly 1000 replicas having been created for the layer.

So far we have not had any major issues, but is this (seemingly) high number of replicas cause for any concern long-term?

Re: ArcGIS Online hosted feature layer replica limit

PaulFerroLocana — Tue, 07 Feb 2023 19:01:34 GMT

Any updates from @esri on this?

We seem to hitting a maximum of 150 replicas? Can an organization increase this amount?
cc @Anonymous User

Re: ArcGIS Online hosted feature layer replica limit

AaronDick — Fri, 12 Jan 2024 16:40:37 GMT

Would also be interested in getting an answer to this from ESRI. The agency I work for is looking to build a mobile application for the public that needs to include offline mapping and being able to use a hosted feature service (non-editable, but syncable would be ideal). I have talked to developers in other organizations that have gone to great lengths with workarounds to avoid proliferation or replicas. Some have told me there are hard limits on number of replicas and others have mentioned performance issues when large numbers of replicas were generated.

Re: ArcGIS Online hosted feature layer replica limit

JohnMarino — Fri, 12 Jan 2024 18:26:29 GMT

For what it is worth, the original layer that prompted this question is still working well, and as of today has 1,648 replicas. Around this time each year I generally try to go through and purge old replicas, but I am still concerned that someday something unexpected is going to happen because of the number of active replicas.

Re: ArcGIS Online hosted feature layer replica limit

danbecker — Thu, 02 Apr 2026 20:33:59 GMT

This EGDB (Azure DB for PostgreSQL flexible server) has been used heavily since 2023 for a field team of ~50 users working primarily offline in the desert. Before a .py script started hours ago, it had 15,800 fs replicas!

Sync performance was degraded, and I'm fairly certain was impacting attribute rules firing properly when features were created. The arcade script for the AR is likely pushing the limits also; 800 or so lines.

Cleanup couldn't be simpler. Look at the arcpy.da.SyncReplica.lastSyncDate and compare it to a cutoff date you have. Chances are, if the service is active, and the lastSyncDate > 1 month ago, it's likely orphaned. We told the field team to sync before heading out, make sure the offline map is still able to sync (replica not axed) and they're g2g.

ListReplicas—ArcGIS Pro | Documentation

Unregister Replica (Data Management)—ArcGIS Pro | Documentation

I think the better question is, why so many orphaned replicas? I searched for my admin account as syncReplica.owner and found 100+ fs replicas. I know for a fact I was online while I removed the field maps, offline areas. Why weren't the replicas cleaned up at that time?