public List < String > getMissingNodes ( ) { synchronousResponsesLock . lock ( ) ; try { final List < String > missingNodes = new ArrayList < String > ( ) ; for ( Map . Entry < String , Object > entry : responses . entrySet ( ) ) if ( entry . getValue ( ) == NO_RESPONSE ) missingNodes . add ( entry . getKey ( ) ) ; return missingNodes ; } finally { synchronousResponsesLock . unlock ( ) ; } }
Returns the list of node names that didn t provide a response .