String collectionName = (String)settings.get(COLLECTION_NAME);
boolean isAsynchronous = ((Boolean)settings.get(IS_ASYNCHRONOUS)).booleanValue();
if (isAsynchronous) {
try{
ret= new JSAsynchronousMergeDSCollection(collectionName);
} catch (IOException e) {
MergeDataException.mergeDataErrors.add(e.getMessage());
ret = null;