摘要：
随着大数据时代的到来，Hadoop YARN（Yet Another Resource Negotiator）作为Hadoop生态系统中的资源管理框架，其资源分配的公平性成为保证集群高效运行的关键。本文将深入探讨YARN中队列最小资源保障机制，分析其原理，并给出相应的代码实现。
一、
YARN是Hadoop 2.0及以后版本的核心组件，负责管理集群中的资源分配和任务调度。在YARN中，资源分配的公平性对于保证各个队列和应用程序的运行效率至关重要。队列最小资源保障（Queue Min Resources）是YARN提供的一种机制，用于确保每个队列在资源紧张的情况下至少获得一定的资源保障。
二、队列最小资源保障机制原理
队列最小资源保障机制的核心思想是：为每个队列设置一个最小资源阈值，当集群资源紧张时，YARN会保证每个队列至少获得这个阈值内的资源。这样，即使某些队列的资源需求较低，它们也不会因为其他队列的资源竞争而受到不公平对待。
队列最小资源保障机制主要包括以下几个步骤：
1. 队列配置：在YARN配置文件中为每个队列设置最小资源阈值。
2. 资源监控：YARN监控集群资源使用情况，包括CPU、内存和磁盘等。
3. 资源分配：当集群资源紧张时，YARN根据队列的最小资源阈值进行资源分配。
4. 资源调整：当队列的资源使用情况发生变化时，YARN会动态调整队列的资源分配。
三、代码实现
以下是一个简单的队列最小资源保障机制的代码实现，主要涉及YARN的配置和资源监控。
```java
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.client.api.YarnClientApplication;
import org.apache.hadoop.yarn.client.api.NMClient;
import org.apache.hadoop.yarn.client.api.NMClientAsync;
import org.apache.hadoop.yarn.client.api.AMRMClient;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.CallbackHandler;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.CallbackType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.ResourceRequest;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.ResourceRequestType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientEvent;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequest;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientResponse;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientStatus;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestState;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultResultResult;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultResultType;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResultResultResultResultReason;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResultResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResultResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResultResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResultResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResultResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransitionResult结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果;
import org.apache.hadoop.yarn.client.api.AMRMClientAsync.AMRMClientRequestStateTransition结果
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