boolean isProgressing() throws InterruptedException {
      int currentCount = this.count;
      while (currentCount == this.count) {
        if (!isAlive()) return false;
        if (this.t != null) return false;
        Thread.sleep(10);
      }
      return true;
    }
Thread that runs a MetaTableAccessor task until asked stop.
hbase-server/src/test/java/org/apache/hadoop/hbase/TestMetaTableAccessor.java