ubuntu - 有 0 个数据节点正在运行，并且没有节点被排除在此操作中

Question

我已经设置了一个多节点 Hadoop 集群。 NameNode和Secondary namenode运行在同一台机器上，集群只有一个Datanode。所有节点都在 Amazon EC2 机器上配置。

Master节点上的配置文件如下:

masters
54.68.218.192 (public IP of the master node)

slaves
54.68.169.62 (public IP of the slave node)

核心站点.xml

<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

mapred-site.xml

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

hdfs-site.xml

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/datanode</value>
</property>
</configuration>

现在是datanode上的配置文件:

核心站点.xml

<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://54.68.218.192:10001</value>
</property>
</configuration>

mapred-site.xml

<configuration>
<property>
<name>mapred.job.tracker</name>
<value>54.68.218.192:10002</value>
</property>
</configuration>

hdfs-site.xml

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.name.dir</name>
<value>file:/usr/local/hadoop_store/hdfs/datanode</value>
</property>
</configuration>

在 Namenode 上运行的 jps 给出以下信息:

5696 NameNode
6504 Jps
5905 SecondaryNameNode
6040 ResourceManager

和数据节点上的jps:

2883 DataNode
3496 Jps
3381 NodeManager

在我看来是对的。

现在，当我尝试运行 put 命令时:

hadoop fs -put count_inputfile /test/input/

它给我以下错误:

put: File /count_inputfile._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 0 datanode(s) running and no node(s) are excluded in this operation.

数据节点上的日志说明如下:

hadoop-datanode log
INFO org.apache.hadoop.ipc.Client: Retrying connect to server:      54.68.218.192/54.68.218.192:10001. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

yarn 节点管理器日志:

INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

节点管理器(50070)的web UI显示有0个活节点和0个死节点，使用的dfs为100%

我也禁用了 IPV6。

在一些网站上，我发现我还应该编辑 /etc/hosts 文件。我也编辑了它们，它们看起来像这样:

127.0.0.1 localhost
172.31.25.151 ip-172-31-25-151.us-west-2.compute.internal
172.31.25.152 ip-172-31-25-152.us-west-2.compute.internal

为什么我仍然收到错误？

Answer 1

有两件事对我有用，

第 1 步:停止 hadoop 并从 hduser 清理临时文件

sudo rm -R /tmp/*

also, you may need to delete and recreate /app/hadoop/tmp(主要是当我将 hadoop 版本从 2.2.0 更改为 2.7.0 时)

sudo rm -r /app/hadoop/tmp
sudo mkdir -p /app/hadoop/tmp
sudo chown hduser:hadoop /app/hadoop/tmp
sudo chmod 750 /app/hadoop/tmp

第 2 步:格式化名称节点

hdfs namenode -format

现在，我可以看到DataNode

hduser@prayagupd:~$ jps
19135 NameNode
20497 Jps
19477 DataNode
20447 NodeManager
19902 SecondaryNameNode
20106 ResourceManager