@Override
        protected void run() throws IOException {
          getMaster().getMasterCoprocessorHost().preSplitRegion(regionInfo.getTable(), splitRow);
          LOG.info(getClientIdAuditPrefix() + " split " + regionInfo.getRegionNameAsString());

          // Execute the operation asynchronously
          submitProcedure(getAssignmentManager().createSplitProcedure(regionInfo, splitRow));
        }
Switch for the background CatalogJanitor thread. Used for testing. The thread will continue to
run. It will just be a noop if disabled.
@param b If false, the catalog janitor won't do anything.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java