@RestrictedApi(explanation = "Should only be called in ScheduledChore", link = "",
      allowedOnPath = ".*/org/apache/hadoop/hbase/(ScheduledChore|ChoreService).java")
  synchronized void cancelChore(ScheduledChore chore) {
    cancelChore(chore, true);
  }
Cancel any ongoing schedules that this chore has with the implementer of this interface.
<p/>
Call {@link ScheduledChore#cancel()} to cancel a {@link ScheduledChore}, in
{@link ScheduledChore#cancel()} method we will call this method to remove the
{@link ScheduledChore} from this {@link ChoreService}.
hbase-common/src/main/java/org/apache/hadoop/hbase/ChoreService.java