Index: oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStoreService.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStoreService.java	(revision 1615896)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStoreService.java	(working copy)
@@ -17,6 +17,7 @@
 package org.apache.jackrabbit.oak.plugins.segment;
 
 import static com.google.common.base.Preconditions.checkState;
+import static org.apache.jackrabbit.oak.commons.PropertiesUtil.toLong;
 import static org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardUtils.registerMBean;
 
 import java.io.Closeable;
@@ -24,6 +25,8 @@
 import java.io.IOException;
 import java.util.Dictionary;
 import java.util.Hashtable;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 import org.apache.commons.io.FilenameUtils;
 import org.apache.felix.scr.annotations.Activate;
@@ -30,6 +33,7 @@
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.ConfigurationPolicy;
 import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Modified;
 import org.apache.felix.scr.annotations.Property;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
@@ -106,6 +110,13 @@
     private WhiteboardExecutor executor;
     private boolean customBlobStore;
 
+    /**
+     * Blob modified before this time duration would be considered for Blob GC
+     */
+    private static final long DEFAULT_BLOB_GC_MAX_AGE = TimeUnit.HOURS.toSeconds(24);
+    public static final String PROP_BLOB_GC_MAX_AGE = "blobGcMaxAgeInSecs";
+    private long blobGcMaxAgeInSecs = DEFAULT_BLOB_GC_MAX_AGE;
+
     @Override
     protected synchronized SegmentNodeStore getNodeStore() {
         checkState(delegate != null, "service must be activated when used");
@@ -113,9 +124,10 @@
     }
 
     @Activate
-    private void activate(ComponentContext context) throws IOException {
+    private void activate(ComponentContext context, Map<String, ?> config) throws IOException {
         this.context = context;
         this.customBlobStore = Boolean.parseBoolean(lookup(context, CUSTOM_BLOB_STORE));
+        modified(config);
 
         if(blobStore == null && customBlobStore){
             log.info("BlobStore use enabled. SegmentNodeStore would be initialized when BlobStore would be available");
@@ -194,7 +206,7 @@
                     MarkSweepGarbageCollector gc = new MarkSweepGarbageCollector(
                             new SegmentBlobReferenceRetriever(store.getTracker()),
                             (GarbageCollectableBlobStore) store.getBlobStore(),
-                            executor);
+                            executor, blobGcMaxAgeInSecs);
                     gc.collectGarbage();
                 }
             };
@@ -216,6 +228,14 @@
         return null;
     }
 
+    /**
+     * At runtime DocumentNodeStore only pickup modification of certain properties
+     */
+    @Modified
+    protected void modified(Map<String, ?> config){
+        blobGcMaxAgeInSecs = toLong(config.get(PROP_BLOB_GC_MAX_AGE), DEFAULT_BLOB_GC_MAX_AGE);
+    }
+
     @Deactivate
     public synchronized void deactivate() {
         unregisterNodeStore();