(转载)hadoop（13）添加或删除datanode节点-白红宇

(转载)hadoop（13）添加或删除datanode节点

阅读量：6305 次

发布时间：2019-06-22

本文共 7143 字，大约阅读时间需要 23 分钟。

转载：https://www.cnblogs.com/marility/p/9362168.html

1.测试环境

ip	主机名	角色
10.124.147.22	hadoop1	namenode
10.124.147.23	hadoop2	namenode
10.124.147.32	hadoop3	resourcemanager
10.124.147.33	hadoop4	resourcemanager
10.110.92.161	hadoop5	datanode/journalnode
10.110.92.162	hadoop6	datanode
10.122.147.37	hadoop7	datanode

2.配置文件中必备参数

2.1 hdfs-site.xml参数

[hadoop@10-124-147-22 hadoop]$ grep dfs\.host -A10 /usr/local/hadoop/etc/hadoop/hdfs-site.xml
     
     
      dfs.hosts.exclude
     
     
      /usr/local/hadoop/etc/hadoop/dfs_exclude
     
     
     
      
       dfs.hosts
      
      
       /usr/local/hadoop/etc/hadoop/slaves

2.2 yarn-site.xml参数

[hadoop@10-124-147-22 hadoop]$ grep exclude-path -A10 /usr/local/hadoop/etc/hadoop/yarn-site.xml
     
     
      yarn.resourcemanager.nodes.exclude-path
     
     
      /usr/local/hadoop/etc/hadoop/dfs_exclude
     
     
     
      
       yarn.resourcemanager.nodes.include-path
      
      
       /usr/local/hadoop/etc/hadoop/slaves

3.踢除现有主机

1.在namenode主机中，将要踢除主机的ip添加到hdfs-site.xml配置文件dfs.hosts.exclude参数指定的文件dfs_exclude中

[hadoop@10-124-147-22 hadoop]$ cat /usr/local/hadoop/etc/hadoop/dfs_exclude 10.122.147.37

2.将其copy至hadoop其它主机

[hadoop@10-124-147-22 hadoop]$ for i in {
    2,3,4,5,6,7};do scp etc/hadoop/dfs_exclude hadoop$i:/usr/local/hadoop/etc/hadoop/;done

3.更新namenode信息

[hadoop@10-124-147-22 hadoop]$ hdfs dfsadmin -refreshNodesRefresh nodes successful for hadoop1/10.124.147.22:9000Refresh nodes successful for hadoop2/10.124.147.23:9000

4.查看namenode 状态信息

[hadoop@10-124-147-22 hadoop]$ hdfs dfsadmin -reportConfigured Capacity: 1100228980736 (1.00 TB)Present Capacity: 1087754866688 (1013.05 GB)DFS Remaining: 1087752667136 (1013.05 GB)DFS Used: 2199552 (2.10 MB)DFS Used%: 0.00%Under replicated blocks: 11Blocks with corrupt replicas: 0Missing blocks: 0Missing blocks (with replication factor 1): 0-------------------------------------------------Live datanodes (3):Name: 10.122.147.37:50010 (hadoop7)Hostname: hadoop7Decommission Status : Decommission in progressConfigured Capacity: 250831044608 (233.60 GB)DFS Used: 733184 (716 KB)Non DFS Used: 1235771392 (1.15 GB)DFS Remaining: 249594540032 (232.45 GB)DFS Used%: 0.00%DFS Remaining%: 99.51%Configured Cache Capacity: 0 (0 B)Cache Used: 0 (0 B)Cache Remaining: 0 (0 B)Cache Used%: 100.00%Cache Remaining%: 0.00%Xceivers: 1Last contact: Tue Jul 24 10:25:17 CST 2018Name: 10.110.92.161:50010 (hadoop5)Hostname: hadoop5Decommission Status : Normal以下略

可以看到被踢除主机10.122.147.37的状态变成Decommission in progress，表示集群对存放于该节点的副本正在进行转移。当其变成Decommissioned时，即代表已经结束，相当于已经踢除集群。

同时此状态可以在hdfs的web页面查看

5.更新resourcemananger信息

[hadoop@10-124-147-32 hadoop]$ yarn rmadmin -refreshNodes

更新之后，可以在resourcemanager的web页面查看到Active Nodes 的信息

或者使用命令查看

[hadoop@10-124-147-32 hadoop]$ yarn node -listTotal Nodes:2         Node-Id         Node-State Node-Http-Address   Number-of-Running-Containers   hadoop5:37438            RUNNING      hadoop5:8042                              0    hadoop6:9001            RUNNING      hadoop6:8042                              0

4.添加新主机至集群

1.将原hadoop配置文件copy新主机，并安装好java环境

2.在namenode中将新主机的ip添加于dfs.hosts参数指定的文件中

[hadoop@10-124-147-22 hadoop]$ cat /usr/local/hadoop/etc/hadoop/slaves hadoop5hadoop610.122.147.37

3.将该slaves文件同步到其它主机之上

[hadoop@10-124-147-22 hadoop]$ for i in {
    2,3,4,5,6,7};do scp etc/hadoop/slaves hadoop$i:/usr/local/hadoop/etc/hadoop/;done

4.启动新主机的datanode进程和nodemanager进程

[hadoop@10-122-147-37 hadoop]$ sbin/hadoop-daemon.sh start datanodestarting datanode, logging to /letv/hadoop-2.7.6/logs/hadoop-hadoop-datanode-10-122-147-37.out[hadoop@10-122-147-37 hadoop]$ jps3068 DataNode6143 Jps[hadoop@10-122-147-37 hadoop]$ sbin/yarn-daemon.sh start nodemanagerstarting nodemanager, logging to /letv/hadoop-2.7.6/logs/yarn-hadoop-nodemanager-10-122-147-37.out[hadoop@10-122-147-37 hadoop]$ jps6211 NodeManager6403 Jps3068 DataNode

5.刷新namenode

[hadoop@10-124-147-22 hadoop]$ hdfs dfsadmin -refreshNodesRefresh nodes successful for hadoop1/10.124.147.22:9000Refresh nodes successful for hadoop2/10.124.147.23:9000

6.查看hdfs信息

[hadoop@10-124-147-22 hadoop]$ hdfs dfsadmin -refreshNodesRefresh nodes successful for hadoop1/10.124.147.22:9000Refresh nodes successful for hadoop2/10.124.147.23:9000[hadoop@10-124-147-22 hadoop]$ hdfs dfsadmin -reportConfigured Capacity: 1351059292160 (1.23 TB)Present Capacity: 1337331367936 (1.22 TB)DFS Remaining: 1337329156096 (1.22 TB)DFS Used: 2211840 (2.11 MB)DFS Used%: 0.00%Under replicated blocks: 0Blocks with corrupt replicas: 0Missing blocks: 0Missing blocks (with replication factor 1): 0-------------------------------------------------Live datanodes (3):Name: 10.122.147.37:50010 (hadoop7)Hostname: hadoop7Decommission Status : NormalConfigured Capacity: 250831044608 (233.60 GB)DFS Used: 737280 (720 KB)Non DFS Used: 1240752128 (1.16 GB)DFS Remaining: 249589555200 (232.45 GB)DFS Used%: 0.00%DFS Remaining%: 99.51%Configured Cache Capacity: 0 (0 B)Cache Used: 0 (0 B)Cache Remaining: 0 (0 B)Cache Used%: 100.00%Cache Remaining%: 0.00%Xceivers: 1Last contact: Tue Jul 24 17:15:09 CST 2018Name: 10.110.92.161:50010 (hadoop5)Hostname: hadoop5Decommission Status : NormalConfigured Capacity: 550114123776 (512.33 GB)DFS Used: 737280 (720 KB)Non DFS Used: 11195953152 (10.43 GB)DFS Remaining: 538917433344 (501.91 GB)DFS Used%: 0.00%DFS Remaining%: 97.96%Configured Cache Capacity: 0 (0 B)Cache Used: 0 (0 B)Cache Remaining: 0 (0 B)Cache Used%: 100.00%Cache Remaining%: 0.00%Xceivers: 1Last contact: Tue Jul 24 17:15:10 CST 2018Name: 10.110.92.162:50010 (hadoop6)Hostname: hadoop6Decommission Status : NormalConfigured Capacity: 550114123776 (512.33 GB)DFS Used: 737280 (720 KB)Non DFS Used: 1291218944 (1.20 GB)DFS Remaining: 548822167552 (511.13 GB)DFS Used%: 0.00%DFS Remaining%: 99.77%Configured Cache Capacity: 0 (0 B)Cache Used: 0 (0 B)Cache Remaining: 0 (0 B)Cache Used%: 100.00%Cache Remaining%: 0.00%Xceivers: 1Last contact: Tue Jul 24 17:15:10 CST 2018

7.更新resourcemanager信息

[hadoop@10-124-147-32 hadoop]$ yarn rmadmin -refreshNodes[hadoop@10-124-147-32 hadoop]$ yarn node -list18/07/24 18:11:23 INFO client.ConfiguredRMFailoverProxyProvider: Failing over to rm2Total Nodes:3         Node-Id         Node-State Node-Http-Address   Number-of-Running-Containers    hadoop7:3296            RUNNING      hadoop7:8042       hadoop5:37438           RUNNING      hadoop5:8042                              0    hadoop6:9001            RUNNING      hadoop6:8042                              0

8.include与exclude对yarn和hdfs的影响

判断一个nodemanager能否连接到resourcemanager的条件是，该nodemanager出现在include文件且不出现exclude文件中

而hdfs规与yarn不太一样(hdfs中的include直接即为dfs.hosts)，其规则如下表

是否在include	是否在exclude	是否可连接
否	否	无法连接
否	是	无法连接
是	否	可以连接
是	是	可连接，即将解除

如果未指定include或者include为空，即意味着所有节点都在include文件

5.遇到异常

在移除datanode中的，会遇到被移除datanode一直处于Decommission in progress状态，这是因为默认测试环境中，没有设置副本数量，在hadoop中的默认副本数为3，而本测试环境中，因为datanode总共只有3个节点，所以会出现该异常

将副本数量设置成小于datanode数量即可

[hadoop@10-124-147-22 hadoop]$ grep dfs\.replication -C3 /usr/local/hadoop/etc/hadoop/hdfs-site.xml
     
     
      
       dfs.replication
      
      
       1

转载于:https://www.cnblogs.com/yjt1993/p/10495243.html

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