hadoop - MapReduce 作业挂起，等待分配 AM 容器

Question

我尝试将简单的字数统计作为 MapReduce 作业来运行。在本地运行时一切正常(所有工作都在名称节点上完成)。但是，当我尝试使用 YARN(将 mapreduce.framework.name=yarn 添加到 mapred-site.conf)在集群上运行它时，作业挂起。

我在这里遇到了类似的问题: MapReduce jobs get stuck in Accepted state

作业输出:

*** START ***
15/12/25 17:52:50 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
15/12/25 17:52:51 WARN mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
15/12/25 17:52:51 INFO input.FileInputFormat: Total input paths to process : 5
15/12/25 17:52:52 INFO mapreduce.JobSubmitter: number of splits:5
15/12/25 17:52:52 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1451083949804_0001
15/12/25 17:52:53 INFO impl.YarnClientImpl: Submitted application application_1451083949804_0001
15/12/25 17:52:53 INFO mapreduce.Job: The url to track the job: http://hadoop-droplet:8088/proxy/application_1451083949804_0001/
15/12/25 17:52:53 INFO mapreduce.Job: Running job: job_1451083949804_0001

mapred-site.xml:

<configuration>

<property>
   <name>mapreduce.framework.name</name>
   <value>yarn</value>
</property>

<property>
   <name>mapreduce.job.tracker</name>
   <value>localhost:54311</value>
</property> 

<!--
<property>
   <name>mapreduce.job.tracker.reserved.physicalmemory.mb</name>
   <value></value>
</property>

<property>
   <name>mapreduce.map.memory.mb</name>
   <value>1024</value>
</property>

<property>
   <name>mapreduce.reduce.memory.mb</name>
   <value>2048</value>
</property>    

<property>
   <name>yarn.app.mapreduce.am.resource.mb</name>
   <value>3000</value>
   <source>mapred-site.xml</source>
</property> -->

</configuration>

yarn-site.xml

<configuration>
 <property>
   <name>yarn.nodemanager.aux-services</name>
   <value>mapreduce_shuffle</value>
 </property>
 <property>
   <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
   <value>org.apache.hadoop.mapred.ShuffleHandler</value>
 </property>

<!--
<property>
<name>yarn.nodemanager.resource.memory-mb</name>
<value>3000</value>
<source>yarn-site.xml</source>
</property>

<property>
  <name>yarn.scheduler.minimum-allocation-mb</name>
  <value>500</value>
</property>

<property>
<name>yarn.scheduler.capacity.maximum-am-resource-percent</name>
<value>3000</value>
</property>
-->

</configuration>

//我留下了注释选项——它们没有解决问题

YarnApplicationState:ACCEPTED:WAITING AM 容器分配、启动并向 RM 注册。

可能是什么问题？

编辑:

我在机器上试过这个配置(评论):NameNode(8GB RAM)+ 2x DataNode(4GB RAM)。我得到了同样的效果:作业卡在已接受状态。

编辑2:将配置(感谢@Manjunath Ballur)更改为:

yarn 网站.xml:

<configuration>
  <property>
    <name>yarn.resourcemanager.hostname</name>
    <value>hadoop-droplet</value>
  </property>

  <property>
    <name>yarn.resourcemanager.resource-tracker.address</name>
    <value>hadoop-droplet:8031</value>
  </property>
  <property>
    <name>yarn.resourcemanager.address</name>
    <value>hadoop-droplet:8032</value>
  </property>
  <property>
    <name>yarn.resourcemanager.scheduler.address</name>
    <value>hadoop-droplet:8030</value>
  </property>
  <property>
    <name>yarn.resourcemanager.admin.address</name>
    <value>hadoop-droplet:8033</value>
  </property>
  <property>
    <name>yarn.resourcemanager.webapp.address</name>
    <value>hadoop-droplet:8088</value>
  </property>
  <property>
    <description>Classpath for typical applications.</description>
    <name>yarn.application.classpath</name>
    <value>
        $HADOOP_CONF_DIR,
        $HADOOP_COMMON_HOME/*,$HADOOP_COMMON_HOME/lib/*,
        $HADOOP_HDFS_HOME/*,$HADOOP_HDFS_HOME/lib/*,
        $HADOOP_MAPRED_HOME/*,$HADOOP_MAPRED_HOME/lib/*,
        $YARN_HOME/*,$YARN_HOME/lib/*
    </value>
  </property>
  <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce.shuffle</value>
  </property>
  <property>
    <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
    <value>org.apache.hadoop.mapred.ShuffleHandler</value>
  </property>
  <property>
    <name>yarn.nodemanager.local-dirs</name>
    <value>/data/1/yarn/local,/data/2/yarn/local,/data/3/yarn/local</value>
  </property>
  <property>
    <name>yarn.nodemanager.log-dirs</name>
    <value>/data/1/yarn/logs,/data/2/yarn/logs,/data/3/yarn/logs</value>
  </property>
  <property>
    <description>Where to aggregate logs</description>
    <name>yarn.nodemanager.remote-app-log-dir</name>
    <value>/var/log/hadoop-yarn/apps</value>
  </property>
  <property> 
    <name>yarn.scheduler.minimum-allocation-mb</name> 
    <value>50</value>
  </property>
  <property> 
    <name>yarn.scheduler.maximum-allocation-mb</name> 
    <value>390</value>
  </property>
  <property> 
    <name>yarn.nodemanager.resource.memory-mb</name> 
    <value>390</value>
  </property>
</configuration>

mapred-site.xml:

<configuration>
<property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
</property>

<property>  
    <name>yarn.app.mapreduce.am.resource.mb</name>  
    <value>50</value>
</property>
<property> 
    <name>yarn.app.mapreduce.am.command-opts</name> 
    <value>-Xmx40m</value>
</property>
<property>
    <name>mapreduce.map.memory.mb</name>
    <value>50</value>
</property>
<property>
    <name>mapreduce.reduce.memory.mb</name>
    <value>50</value>
</property>
<property>
    <name>mapreduce.map.java.opts</name>
    <value>-Xmx40m</value>
</property>
<property>
    <name>mapreduce.reduce.java.opts</name>
    <value>-Xmx40m</value>
</property>
</configuration>

还是不行。附加信息:我在集群预览中看不到任何节点(此处类似问题:Slave nodes not in Yarn ResourceManager)

Answer 1

您应该检查集群中节点管理器的状态。如果 NM 节点的磁盘空间不足，则 RM 会将它们标记为“不健康”，并且这些 NM 无法分配新容器。

1) 检查不健康的节点:http://<active_RM>:8088/cluster/nodes/unhealthy

如果“健康报告”选项卡显示“本地目录有问题”，则意味着您需要清理这些节点的一些磁盘空间。

2) 检查 DFS dfs.data.dir属性(property) hdfs-site.xml .它指向存储 hdfs 数据在本地文件系统上的位置。

3) 登录到这些机器并使用 df -h & hadoop fs - du -h测量占用空间的命令。

4) 验证 hadoop 垃圾并在它阻止您时将其删除。 hadoop fs -du -h /user/user_name/.Trash和 hadoop fs -rm -r /user/user_name/.Trash/*