get the number of blacklisted task trackers in the cluster . concode_field_sep Collection<String> activeTrackers concode_elem_sep int max_reduce_tasks concode_elem_sep int numActiveTrackers concode_elem_sep Collection<String> blacklistedTrackers concode_elem_sep int numBlacklistedTrackers concode_elem_sep long UNINITIALIZED_MEMORY_VALUE concode_elem_sep long used_memory concode_elem_sep int numGraylistedTrackers concode_elem_sep int reduce_tasks concode_elem_sep int map_tasks concode_elem_sep int max_map_tasks concode_elem_sep long ttExpiryInterval concode_elem_sep JobTracker.State state concode_elem_sep Collection<String> graylistedTrackers concode_elem_sep int numExcludedNodes concode_elem_sep long max_memory concode_field_sep long getTTExpiryInterval concode_elem_sep int getMaxMapTasks concode_elem_sep int getGraylistedTrackers concode_elem_sep int getNumExcludedNodes concode_elem_sep Collection<String> getGraylistedTrackerNames concode_elem_sep long getUsedMemory concode_elem_sep int getMapTasks concode_elem_sep int getReduceTasks concode_elem_sep void readFields concode_elem_sep Collection<String> getBlacklistedTrackerNames concode_elem_sep int getTaskTrackers concode_elem_sep Collection<String> getActiveTrackerNames concode_elem_sep long getMaxMemory concode_elem_sep int getMaxReduceTasks concode_elem_sep void write concode_elem_sep JobTracker.State getJobTrackerState
int function ( ) { return numBlacklistedTrackers ; }