@Override
      public void afterHavingCompacted() {
        synchronized (region) {
          region.notify();
          hasBeenNotified = true;
        }
      }
OplogRoller should correctly add those entries created in an Oplog , but by the time rolling
has started , the entry exists in the current oplog
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegOplogSwtchingAndRollerJUnitTest.java