Index: oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreRegistrar.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreRegistrar.java	(revision 9f1e8bdc6c91ba750ac1eea540fe59ac89ef9114)
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreRegistrar.java	(date 1535703785000)
@@ -397,7 +397,7 @@
             }
         }
 
-        if (cfg.isPrimarySegmentStore() && cfg.getBlobStore() instanceof GarbageCollectableBlobStore) {
+        if (!cfg.isSecondarySegmentStore() && cfg.getBlobStore() instanceof GarbageCollectableBlobStore) {
             BlobGarbageCollector gc = new MarkSweepGarbageCollector(
                 new SegmentBlobReferenceRetriever(store),
                 (GarbageCollectableBlobStore) cfg.getBlobStore(),
Index: oak-segment-tar/src/test/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreServiceTest.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-segment-tar/src/test/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreServiceTest.java	(revision 9f1e8bdc6c91ba750ac1eea540fe59ac89ef9114)
+++ oak-segment-tar/src/test/java/org/apache/jackrabbit/oak/segment/SegmentNodeStoreServiceTest.java	(date 1535704951000)
@@ -28,7 +28,9 @@
 import java.io.File;
 import java.util.Map;
 
+import org.apache.jackrabbit.oak.plugins.blob.BlobGCMBean;
 import org.apache.jackrabbit.oak.spi.blob.BlobStore;
+import org.apache.jackrabbit.oak.spi.blob.GarbageCollectableBlobStore;
 import org.apache.jackrabbit.oak.spi.state.NodeStore;
 import org.apache.jackrabbit.oak.stats.StatisticsProvider;
 import org.apache.sling.testing.mock.osgi.junit.OsgiContext;
@@ -100,6 +102,7 @@
 
         registerSegmentNodeStoreService(true);
         assertServiceActivated();
+        assertNotNull(context.getService(BlobGCMBean.class));
 
         unregisterSegmentNodeStoreService();
         unregisterBlobStore();
@@ -158,7 +161,7 @@
     private ServiceRegistration blobStore;
 
     private void registerBlobStore() {
-        blobStore = context.bundleContext().registerService(BlobStore.class.getName(), mock(BlobStore.class), null);
+        blobStore = context.bundleContext().registerService(BlobStore.class.getName(), mock(GarbageCollectableBlobStore.class), null);
     }
 
     private void unregisterBlobStore() {