Index: oak-core/src/test/java/org/apache/jackrabbit/oak/plugins/document/JournalTest.java
===================================================================
--- oak-core/src/test/java/org/apache/jackrabbit/oak/plugins/document/JournalTest.java	(revision 1684896)
+++ oak-core/src/test/java/org/apache/jackrabbit/oak/plugins/document/JournalTest.java	(working copy)
@@ -188,6 +188,7 @@
         ns1.renewClusterIdLease();
         JournalGarbageCollector gc = new JournalGarbageCollector(ns1);
         // first clean up
+        Thread.sleep(100); // OAK-2979 : wait 100ms before doing the cleanup
         gc.gc(1, TimeUnit.MILLISECONDS);
         Thread.sleep(100); // sleep just quickly
         assertEquals(0, gc.gc(1, TimeUnit.DAYS));