private void onPathDelete(String path) {
      eventExecutor.execute(() -> delete(path));
    }
Tell the background executor to perform any initialization needed. This should be called after registering this
listener using {@link HelixPropertyStore#subscribe}. This will ensure that the first event sent to
{@link #listener} will contain the entire set of current configs.
@throws Exception if there was an exception while making the initialization call.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/PropertyStoreToDataNodeConfigAdapter.java