code: protected void maybeSignalForMoreConnections(ThriftConnectionPartition<T> connectionPartition) {
  		if (!connectionPartition.isUnableToCreateMoreTransactions() && !this.poolShuttingDown
  				&& connectionPartition.getAvailableConnections() * 100
  						/ connectionPartition.getMaxConnections() <= this.poolAvailabilityThreshold) {
  			connectionPartition.getPoolWatchThreadSignalQueue().offer(new Object());
  		}
  	}
docs: 检查连接分区的连接数量<br>
  如果连接数量不足则向事件队列中添加新的创建连接信号
  
  @param connectionPartition
  需要检测的连接分区