Index: oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreService.java
===================================================================
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreService.java	(revision 1774032)
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreService.java	(working copy)
@@ -523,17 +523,21 @@
         }
         SegmentNodeStore segmentNodeStore = segmentNodeStoreBuilder.build();
 
-        ObserverTracker observerTracker = new ObserverTracker(segmentNodeStore);
-        observerTracker.start(context.getBundleContext());
-        registrations.register(asCloseable(observerTracker));
+        if (isPrimarySegmentStore(role)) {
+            ObserverTracker observerTracker = new ObserverTracker(segmentNodeStore);
+            observerTracker.start(context.getBundleContext());
+            registrations.register(asCloseable(observerTracker));
+        }
 
-        mbeans.add(registerMBean(
-                whiteboard,
-                CheckpointMBean.class,
-                new SegmentCheckpointMBean(segmentNodeStore), CheckpointMBean.TYPE,
-                appendRole("Segment node store checkpoint management", role)));
+        if (isPrimarySegmentStore(role)) {
+            mbeans.add(registerMBean(
+                    whiteboard,
+                    CheckpointMBean.class,
+                    new SegmentCheckpointMBean(segmentNodeStore), CheckpointMBean.TYPE,
+                    appendRole("Segment node store checkpoint management", role)));
+        }
 
-        if (descriptors) {
+        if (descriptors && isPrimarySegmentStore(role)) {
             // ensure a clusterId is initialized
             // and expose it as 'oak.clusterid' repository descriptor
             GenericDescriptors clusterIdDesc = new GenericDescriptors();
@@ -583,16 +587,14 @@
             }
         }
 
-        if (store.getBlobStore() instanceof GarbageCollectableBlobStore) {
-            final long blobGcMaxAgeInSecs = toLong(property(PROP_BLOB_GC_MAX_AGE, context), DEFAULT_BLOB_GC_MAX_AGE);
+        if (store.getBlobStore() instanceof GarbageCollectableBlobStore && isPrimarySegmentStore(role)) {
             BlobGarbageCollector gc = new MarkSweepGarbageCollector(
                     new SegmentBlobReferenceRetriever(store),
                     (GarbageCollectableBlobStore) store.getBlobStore(),
                     executor,
-                    TimeUnit.SECONDS.toMillis(blobGcMaxAgeInSecs),
+                    TimeUnit.SECONDS.toMillis(getBlobGcMaxAge(context)),
                     repoId
             );
-
             mbeans.add(registerMBean(
                     whiteboard,
                     BlobGCMBean.class,
@@ -639,10 +641,12 @@
             return segmentNodeStore;
         }
 
-        Map<String, Object> props = new HashMap<String, Object>();
-        props.put(Constants.SERVICE_PID, SegmentNodeStore.class.getName());
-        props.put("oak.nodestore.description", new String[] {"nodeStoreType=segment"});
-        registrations.register(asCloseable(whiteboard.register(NodeStore.class, segmentNodeStore, props)));
+        if (isPrimarySegmentStore(role)) {
+            Map<String, Object> props = new HashMap<String, Object>();
+            props.put(Constants.SERVICE_PID, SegmentNodeStore.class.getName());
+            props.put("oak.nodestore.description", new String[] {"nodeStoreType=segment"});
+            registrations.register(asCloseable(whiteboard.register(NodeStore.class, segmentNodeStore, props)));
+        }
 
         return segmentNodeStore;
     }
@@ -729,6 +733,10 @@
         return System.getProperty(propertyName);
     }
 
+    private static long getBlobGcMaxAge(ComponentContext context) {
+        return toLong(property(PROP_BLOB_GC_MAX_AGE, context), DEFAULT_BLOB_GC_MAX_AGE);
+    }
+
     private static int getSegmentCacheSize(ComponentContext context) {
         return toInteger(getCacheSize(SEGMENT_CACHE_SIZE, context), DEFAULT_SEGMENT_CACHE_MB);
     }
@@ -802,4 +810,8 @@
         };
     }
 
+    private static boolean isPrimarySegmentStore(String role) {
+        return role == null;
+    }
+
 }