@Override
          public void goingToFlush() {
            synchronized (OplogJUnitTest.this) {
              LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = false;
              OplogJUnitTest.this.notify();
            }
          }
Tests if buffer size is set but time is not set , the asynch writer gets awakened on buffer
size basis
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/OplogJUnitTest.java