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https://issues.apache.org/jira/browse/OAK-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15705855#comment-15705855
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Stefan Egli commented on OAK-5179:
----------------------------------
bq. I think a good rule of the thumb is that the primary node store ( Segment
or Document ) should decide what descriptors are registered
ok, makes sense. And I think that will work fine as indeed the clustering
structure is defined by that primary node store as you pointed out. So in the
non-multiplexed case the descriptors is created by eg DocumentNodeStoreService
- the question then I guess is how to generalize that code such that the
MultiplexingNodeStoreService can trigger that. As I think you basically want to
reuse the {{DocumentDiscoveryLiteService}}
> MultiplexingNodeStoreService does not register an OSGi service for
> oak.api.Descriptors
> --------------------------------------------------------------------------------------
>
> Key: OAK-5179
> URL: https://issues.apache.org/jira/browse/OAK-5179
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core
> Reporter: Robert Munteanu
> Fix For: 1.5.15
>
> Attachments:
> 0001-OAK-5179-MultiplexingNodeStoreService-does-not-regis.patch,
> 0001-OAK-5179-MultiplexingNodeStoreService-does-not-regis.patch
>
>
> When starting up Apache Sling with a MultiplexingNodeStore backend Sling's
> discovery mechanism fails to read the repository descriptors.
> {noformat}19.11.2016 13:43:06.101 *ERROR*
> [discovery.connectors.common.runner.331bcf42-1d0d-4b53-bf1f-c7e9df060758.discoveryLiteCheck]
> org.apache.sling.discovery.oak.cluster.OakClusterViewService
> getLocalClusterView: repository exception: java.lang.Exception: No Descriptor
> value available
> java.lang.Exception: No Descriptor value available
> at
> org.apache.sling.discovery.commons.providers.spi.base.DiscoveryLiteDescriptor.getDescriptorFrom(DiscoveryLiteDescriptor.java:45)
> at
> org.apache.sling.discovery.oak.cluster.OakClusterViewService.getLocalClusterView(OakClusterViewService.java:112)
> at
> org.apache.sling.discovery.base.commons.BaseDiscoveryService.getTopology(BaseDiscoveryService.java:77)
> at
> org.apache.sling.discovery.oak.OakDiscoveryService.checkForTopologyChange(OakDiscoveryService.java:657)
> at
> org.apache.sling.discovery.oak.pinger.OakViewChecker.discoveryLiteCheck(OakViewChecker.java:217)
> at
> org.apache.sling.discovery.oak.pinger.OakViewChecker.access$000(OakViewChecker.java:62)
> at
> org.apache.sling.discovery.oak.pinger.OakViewChecker$1.run(OakViewChecker.java:193)
> at
> org.apache.sling.discovery.base.commons.PeriodicBackgroundJob.safelyRun(PeriodicBackgroundJob.java:86)
> at
> org.apache.sling.discovery.base.commons.PeriodicBackgroundJob.run(PeriodicBackgroundJob.java:77)
> at java.lang.Thread.run(Thread.java:745){noformat}
> I noticed that these descriptors are registered as OSGi services for the
> other stores - Segment ( 'old' and tar ), Document.
> The MultiplexingNodeStoreService should register these as well.
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