Hadoop 系列 HDFS：分布式文件系统（HDFS集群模式）

HDFS：分布式文件系统

HDFS集群模式

节点	IP	角色
node1	192.168.55.128	NameNode，DataNode
node2	192.168.55.129	SecondaryNameNode，DataNode
node3	192.168.55.130	DataNode

Hadoop环境变量

[root@node1 ~]# vi /etc/profile.d/custom.sh

#Hadoop path
export HADOOP_HOME=/opt/hadoop-2.7.3
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

[root@node1 ~]# source /etc/profile.d/custom.sh

同理在node2和node3也要进行类似的环境变量配置。

准备工作

由于前面在node1上部署了Hadoop单机模式，需要停止Hadoop所有服务并清除数据目录。顺便检验一下设置的Hadoop环境变量。

清除Hadoop数据目录

[root@node1 ~]# rm -rf /tmp/hadoop-root/

core-site.xml

[root@node1 ~]# cd /opt/hadoop-2.7.3/etc/hadoop/
[root@node1 hadoop]# vi core-site.xml

core-site.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8"?> 
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
 <configuration> 
　　<property>
　　　　 <name>fs.defaultFS</name>
 　　　　<value>hdfs://node1:9000</value> 
　　</property>
　 <property>
　　　　 <name>hadoop.tmp.dir</name>
　　　　 <value>/var/data/hadoop</value>
   </property>
  <property>
 　　　　<name>io.file.buffer.size</name>
　　　　 <value>65536</value>
 </property>
 </configuration>

hdfs-site.xm

[root@node1 hadoop]# vi hdfs-site.xml

hdfs-site.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
 　　<configuration>
 　　　　<property>
 　　　　　　<name>dfs.replication</name>
 　　　　　　<value>3</value>
　　　　 </property> 
　　　　<property>
　　　　　　 <name>dfs.namenode.secondary.http-address</name>
　　　　　　 <value>node2:50090</value>
　　　　 </property>
　　　　 <property>
 　　　　　　<name>dfs.namenode.secondary.https-address</name>  
　　　　　　<value>node2:50091</value>
 　　　　</property>
 </configuration>

slaves

编辑slaves文件

[root@node1 hadoop]# vi slaves

slaves文件内容设置为：

分发文件

将Hadoop软件包复制到node2和node3节点上

[root@node1 ~]# scp -r /opt/hadoop-2.7.3/ node2:/opt

[root@node1 ~]# scp -r /opt/hadoop-2.7.3/ node3:/opt

将环境变量文件复制到node2和node3节点上

[root@node2 ~]# source /etc/profile.d/custom.sh

[root@node3 ~]# source /etc/profile.d/custom.sh

NameNode格式化

[root@node1 ~]# hdfs namenode -format

18/11/22 22:09:59 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
18/11/22 22:09:59 INFO namenode.NameNode: createNameNode [-format]
Formatting using clusterid: CID-1435a0cf-33c1-4c5e-9473-b88769f60dcd
18/11/22 22:10:03 INFO namenode.FSNamesystem: No KeyProvider found.
18/11/22 22:10:03 INFO namenode.FSNamesystem: fsLock is fair:true
18/11/22 22:10:03 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
18/11/22 22:10:03 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
18/11/22 22:10:03 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
18/11/22 22:10:03 INFO blockmanagement.BlockManager: The block deletion will start around 2018 Nov 22 22:10:03
18/11/22 22:10:03 INFO util.GSet: Computing capacity for map BlocksMap
18/11/22 22:10:03 INFO util.GSet: VM type       = 64-bit
18/11/22 22:10:04 INFO util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
18/11/22 22:10:04 INFO util.GSet: capacity      = 2^21 = 2097152 entries
18/11/22 22:10:04 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
18/11/22 22:10:04 INFO blockmanagement.BlockManager: defaultReplication         = 3
18/11/22 22:10:04 INFO blockmanagement.BlockManager: maxReplication             = 512
18/11/22 22:10:04 INFO blockmanagement.BlockManager: minReplication             = 1
18/11/22 22:10:04 INFO blockmanagement.BlockManager: maxReplicationStreams      = 2
18/11/22 22:10:04 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
18/11/22 22:10:04 INFO blockmanagement.BlockManager: encryptDataTransfer        = false
18/11/22 22:10:04 INFO blockmanagement.BlockManager: maxNumBlocksToLog          = 1000
18/11/22 22:10:04 INFO namenode.FSNamesystem: fsOwner             = root (auth:SIMPLE)
18/11/22 22:10:04 INFO namenode.FSNamesystem: supergroup          = supergroup
18/11/22 22:10:04 INFO namenode.FSNamesystem: isPermissionEnabled = true
18/11/22 22:10:04 INFO namenode.FSNamesystem: HA Enabled: false
18/11/22 22:10:04 INFO namenode.FSNamesystem: Append Enabled: true
18/11/22 22:10:07 INFO util.GSet: Computing capacity for map INodeMap
18/11/22 22:10:07 INFO util.GSet: VM type       = 64-bit
18/11/22 22:10:07 INFO util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
18/11/22 22:10:07 INFO util.GSet: capacity      = 2^20 = 1048576 entries
18/11/22 22:10:07 INFO namenode.FSDirectory: ACLs enabled? false
18/11/22 22:10:07 INFO namenode.FSDirectory: XAttrs enabled? true
18/11/22 22:10:07 INFO namenode.FSDirectory: Maximum size of an xattr: 16384
18/11/22 22:10:07 INFO namenode.NameNode: Caching file names occuring more than 10 times
18/11/22 22:10:07 INFO util.GSet: Computing capacity for map cachedBlocks
18/11/22 22:10:07 INFO util.GSet: VM type       = 64-bit
18/11/22 22:10:07 INFO util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
18/11/22 22:10:07 INFO util.GSet: capacity      = 2^18 = 262144 entries
18/11/22 22:10:07 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
18/11/22 22:10:07 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
18/11/22 22:10:07 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension     = 30000
18/11/22 22:10:07 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.window.num.buckets = 10
18/11/22 22:10:07 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.num.users = 10
18/11/22 22:10:07 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.windows.minutes = 1,5,25
18/11/22 22:10:07 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
18/11/22 22:10:07 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
18/11/22 22:10:08 INFO util.GSet: Computing capacity for map NameNodeRetryCache
18/11/22 22:10:08 INFO util.GSet: VM type       = 64-bit
18/11/22 22:10:08 INFO util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
18/11/22 22:10:08 INFO util.GSet: capacity      = 2^15 = 32768 entries
18/11/22 22:10:08 INFO namenode.FSImage: Allocated new BlockPoolId: BP-1249797347-192.168.55.128-1542942608346
18/11/22 22:10:08 INFO common.Storage: Storage directory /var/data/hadoop/dfs/name has been successfully formatted.
18/11/22 22:10:09 INFO namenode.FSImageFormatProtobuf: Saving image file /var/data/hadoop/dfs/name/current/fsimage.ckpt_0000000000000000000 using no compression
18/11/22 22:10:10 INFO namenode.FSImageFormatProtobuf: Image file /var/data/hadoop/dfs/name/current/fsimage.ckpt_0000000000000000000 of size 351 bytes saved in 0 seconds.
18/11/22 22:10:10 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
18/11/22 22:10:10 INFO util.ExitUtil: Exiting with status 0
18/11/22 22:10:10 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at node1/192.168.55.128
************************************************************/

[root@node1 ~]# ll /var/data/hadoop/dfs/name/current/
total 16
-rw-r--r-- 1 root root 351 Nov 22 22:10 fsimage_0000000000000000000
-rw-r--r-- 1 root root  62 Nov 22 22:10 fsimage_0000000000000000000.md5
-rw-r--r-- 1 root root   2 Nov 22 22:10 seen_txid
-rw-r--r-- 1 root root 207 Nov 22 22:10 VERSION

启动HDFS

[root@node1 ~]# start-dfs.sh
Starting namenodes on [node1]
node1: starting namenode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-namenode-node1.out
node3: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-datanode-node3.out
node2: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-datanode-node2.out
node1: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-datanode-node1.out
Starting secondary namenodes [node2]
node2: starting secondarynamenode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-secondarynamenode-node2.out
[root@node1 ~]#