Timothee Maret commented on OAK-4883:

[~frm] I assume you mean that line [0]. If so, it behaves the same as before 
the patch in OAK-4089. A node store instance is build however it is registered 
only if the instance is *not* a primary [1].

The patch keeps the goal of OAK-4089, by not registering the observation 
subsystem as mentioned in [2].

AFAIU, a node store instance is required in order to build the {{BlobGCMBean}}.
I may be wrong about that or maybe there's a way to get the required 
information to build the {{BlobGCMBean}}. If so I'd be happy to update the 


> Missing BlobGarbageCollection MBean on standby instance
> -------------------------------------------------------
>                 Key: OAK-4883
>                 URL: https://issues.apache.org/jira/browse/OAK-4883
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: segment-tar, segmentmk
>            Reporter: Alex Parvulescu
>            Assignee: Timothee Maret
>              Labels: gc
>         Attachments: OAK-4883.patch
> The {{BlobGarbageCollection}} MBean is no longer available on a standby 
> instance, this affects non-shared datastore setups (on a shared datastore 
> you'd only need to run blob gc on the primary).
> This change was introduced by OAK-4089 (and backported to 1.4 branch with 
> OAK-4093).

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