private void checkObsoleteConfigurations() {
    Configuration conf = master.getConfiguration();

    if (conf.get("hbase.mob.compaction.mergeable.threshold") != null) {
      LOG.warn("'hbase.mob.compaction.mergeable.threshold' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.delfile.max.count") != null) {
      LOG.warn("'hbase.mob.delfile.max.count' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.compaction.threads.max") != null) {
      LOG.warn("'hbase.mob.compaction.threads.max' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.compaction.batch.size") != null) {
      LOG.warn("'hbase.mob.compaction.batch.size' is obsolete and not used anymore.");
    }
  }
The class MobFileCleanerChore for running cleaner regularly to remove the expired and obsolete
(files which have no active references to) mob files.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFileCleanerChore.java