Hadoop Balancer prematurely exits iterations

    private void dispatchBlocks() {
      long startTime = Time.now();
      long scheduledSize = getScheduledSize();
      this.blocksToReceive = 2*scheduledSize;
      boolean isTimeUp = false;
      int noPendingBlockIteration = 0;
      while(!isTimeUp && getScheduledSize()>0 &&
          (!srcBlockList.isEmpty() || blocksToReceive>0)) {
        PendingBlockMove pendingBlock = chooseNextBlockToMove();
        if (pendingBlock != null) {
          noPendingBlockIteration = 0;
          // move the block
          pendingBlock.scheduleBlockMove();
          continue;
        }

        /* Since we can not schedule any block to move,
         * filter any moved blocks from the source block list and
         * check if we should fetch more blocks from the namenode
         */
        filterMovedBlocks(); // filter already moved blocks
        if (shouldFetchMoreBlocks()) {
          // fetch new blocks
          try {
            blocksToReceive -= getBlockList();
            continue;
          } catch (IOException e) {
            LOG.warn("Exception while getting block list", e);
            return;
          }
        } else {
          // source node cannot find a pendingBlockToMove, iteration +1
          noPendingBlockIteration++;
          // in case no blocks can be moved for source node's task,
          // jump out of while-loop after 5 iterations.
          if (noPendingBlockIteration >= MAX_NO_PENDING_BLOCK_ITERATIONS) {
            setScheduledSize(0);
          }
        }

        // check if time is up or not
        if (Time.now()-startTime > MAX_ITERATION_TIME) {
          isTimeUp = true;
          continue;
        }

        /* Now we can not schedule any block to move and there are
         * no new blocks added to the source block list, so we wait.
         */
        try {
          synchronized(Balancer.this) {
            Balancer.this.wait(1000);  // wait for targets/sources to be idle
          }
        } catch (InterruptedException ignored) {
        }
      }
    }
  }