Hive进行数据统计时报错：org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster

报错详情：

2020-04-09 22:56:58,827 ERROR [Listener at 0.0.0.0/45871] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster

org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.NullPointerException

    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.register(RMCommunicator.java:178)

    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.serviceStart(RMCommunicator.java:122)

    at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.serviceStart(RMContainerAllocator.java:280)

    at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)

    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.serviceStart(MRAppMaster.java:979)

    at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)

    at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)

    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1293)

    at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)

    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$6.run(MRAppMaster.java:1761)

    at java.security.AccessController.doPrivileged(Native Method)

    at javax.security.auth.Subject.doAs(Subject.java:422)

    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)

    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1757)

    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1691)

Caused by: java.lang.NullPointerException

    at org.apache.hadoop.mapreduce.v2.app.client.MRClientService.getHttpPort(MRClientService.java:177)

    at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.register(RMCommunicator.java:159)

    ... 14 more

2020-04-09 22:56:58,818 INFO [TaskHeartbeatHandler PingChecker] org.apache.hadoop.mapreduce.v2.app.TaskHeartbeatHandler: TaskHeartbeatHandler thread interrupted

2020-04-09 22:56:58,819 INFO [Ping Checker] org.apache.hadoop.yarn.util.AbstractLivelinessMonitor: TaskAttemptFinishingMonitor thread interrupted

阅读源代码，会发现这是由于org.apache.hadoop.yarn.server.webproxy.amfilter.AmFilterInitializer.java这个类中的一段代码引起的，涉及的代码如下：

if (rmIds != null) {

      List<String> urls = new ArrayList<>();

      for (String rmId : rmIds) {

        String url = getUrlByRmId(yarnConf, rmId);

        // urls.add(url); // 注释掉这端代码，修改为下面的if语句判断是否为null

        if (url != null) {

          urls.add(url);

        }

      }

      if (!urls.isEmpty()) {

        params.put(RM_HA_URLS, StringUtils.join(",", urls));

      }

    }

这与yarn-site.xml配置HA的兼容性有关，取决于 yarn.resourcemanager.webapp.address 和 yarn.resourcemanager.webapp.https.address 是否为空。

修改源码的方法：

1、首先将hadoop-yarn-server-web-proxy-3.2.1.jar从服务器上拿下来。

2、使用JD-GUI打开，复制org.apache.hadoop.yarn.server.webproxy.amfilter.AmFilterInitializer.java类中代码；

3、在eclipse新建一个工程，然后新建一个类插入复制的代码，并进行修改。

4、有报错的话就build class，把本地的hadoop相关的包导入

5、将该工程导出为jar包。

6、分别打开hadoop-yarn-server-web-proxy-3.2.1.jar 和刚导出的jar包用解压软件打开，替换原来的org.apache.hadoop.yarn.server.webproxy.amfilter.AmFilterInitializer.class文件。

修改完后替换原来的jar包，重启hdfs和yarn.job运行成功！

巴特西

Hive进行数据统计时报错：org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster

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