Hadoop快速入门（Hadoop单机运行）

Hadoop快速入门

Hadoop单机运行

衔接上一章节，首先切换到Hadoop根目录

namenode格式化

执行bin/hadoop namenode -format命令，进行namenode格式化

18/11/22 08:02:18 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
18/11/22 08:02:18 INFO namenode.NameNode: createNameNode [-format]
Formatting using clusterid: CID-eeda45a6-6cd5-4121-9a73-998e2a00a91b
18/11/22 08:02:21 INFO namenode.FSNamesystem: No KeyProvider found.
18/11/22 08:02:21 INFO namenode.FSNamesystem: fsLock is fair:true
18/11/22 08:02:21 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
18/11/22 08:02:21 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
18/11/22 08:02:21 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
18/11/22 08:02:21 INFO blockmanagement.BlockManager: The block deletion will start around 2018 Nov 22 08:02:21
18/11/22 08:02:21 INFO util.GSet: Computing capacity for map BlocksMap
18/11/22 08:02:21 INFO util.GSet: VM type       = 64-bit
18/11/22 08:02:21 INFO util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
18/11/22 08:02:21 INFO util.GSet: capacity      = 2^21 = 2097152 entries
18/11/22 08:02:21 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
18/11/22 08:02:21 INFO blockmanagement.BlockManager: defaultReplication         = 1
18/11/22 08:02:21 INFO blockmanagement.BlockManager: maxReplication             = 512
18/11/22 08:02:21 INFO blockmanagement.BlockManager: minReplication             = 1
18/11/22 08:02:21 INFO blockmanagement.BlockManager: maxReplicationStreams      = 2
18/11/22 08:02:21 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
18/11/22 08:02:21 INFO blockmanagement.BlockManager: encryptDataTransfer        = false
18/11/22 08:02:21 INFO blockmanagement.BlockManager: maxNumBlocksToLog          = 1000
18/11/22 08:02:21 INFO namenode.FSNamesystem: fsOwner             = root (auth:SIMPLE)
18/11/22 08:02:21 INFO namenode.FSNamesystem: supergroup          = supergroup
18/11/22 08:02:21 INFO namenode.FSNamesystem: isPermissionEnabled = true
18/11/22 08:02:21 INFO namenode.FSNamesystem: HA Enabled: false
18/11/22 08:02:21 INFO namenode.FSNamesystem: Append Enabled: true
18/11/22 08:02:22 INFO util.GSet: Computing capacity for map INodeMap
18/11/22 08:02:22 INFO util.GSet: VM type       = 64-bit
18/11/22 08:02:22 INFO util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
18/11/22 08:02:22 INFO util.GSet: capacity      = 2^20 = 1048576 entries
18/11/22 08:02:22 INFO namenode.FSDirectory: ACLs enabled? false
18/11/22 08:02:22 INFO namenode.FSDirectory: XAttrs enabled? true
18/11/22 08:02:22 INFO namenode.FSDirectory: Maximum size of an xattr: 16384
18/11/22 08:02:22 INFO namenode.NameNode: Caching file names occuring more than 10 times
18/11/22 08:02:22 INFO util.GSet: Computing capacity for map cachedBlocks
18/11/22 08:02:22 INFO util.GSet: VM type       = 64-bit
18/11/22 08:02:22 INFO util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
18/11/22 08:02:22 INFO util.GSet: capacity      = 2^18 = 262144 entries
18/11/22 08:02:22 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
18/11/22 08:02:22 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
18/11/22 08:02:22 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension     = 30000
18/11/22 08:02:22 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.window.num.buckets = 10
18/11/22 08:02:22 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.num.users = 10
18/11/22 08:02:22 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.windows.minutes = 1,5,25
18/11/22 08:02:22 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
18/11/22 08:02:22 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
18/11/22 08:02:22 INFO util.GSet: Computing capacity for map NameNodeRetryCache
18/11/22 08:02:22 INFO util.GSet: VM type       = 64-bit
18/11/22 08:02:22 INFO util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
18/11/22 08:02:22 INFO util.GSet: capacity      = 2^15 = 32768 entries
Re-format filesystem in Storage Directory /tmp/hadoop-root/dfs/name ? (Y or N) y
18/11/22 08:02:37 INFO namenode.FSImage: Allocated new BlockPoolId: BP-594298259-192.168.55.128-1542891757196
18/11/22 08:02:37 INFO common.Storage: Storage directory /tmp/hadoop-root/dfs/name has been successfully formatted.
18/11/22 08:02:37 INFO namenode.FSImageFormatProtobuf: Saving image file /tmp/hadoop-root/dfs/name/current/fsimage.ckpt_0000000000000000000 using no compression
18/11/22 08:02:37 INFO namenode.FSImageFormatProtobuf: Image file /tmp/hadoop-root/dfs/name/current/fsimage.ckpt_0000000000000000000 of size 350 bytes saved in 0 seconds.
18/11/22 08:02:37 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
18/11/22 08:02:37 INFO util.ExitUtil: Exiting with status 0
18/11/22 08:02:37 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at node1/192.168.55.128

在执行结果中可以找到has been successfully formatted，说明namenode格式化成功了！

启动HDFS

执行sbin/start-dfs.sh命令启动HDFS

Starting namenodes on [node1]
node1: ssh_exchange_identification: Connection closed by remote host
node1: ssh_exchange_identification: read: Connection reset by peer
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established.
ECDSA key fingerprint is SHA256:Zh8smqg+CZo5EjJE5iK5wd/N4mnrFAPKwDWwC0qzTTw.
ECDSA key fingerprint is MD5:1f:08:e7:24:63:3b:f4:c6:bb:f5:b4:17:c7:dc:28:2b.
Are you sure you want to continue connecting (yes/no)? yes
0.0.0.0: Warning: Permanently added '0.0.0.0' (ECDSA) to the list of known hosts.
root@0.0.0.0's password: 
0.0.0.0: starting secondarynamenode, logging to /opt/hadoop-2.7.3/logs/hadoop-root-secondarynamenode-node1.out

在启动HDFS过程中，按照提示输入“yes”

通过jps命令可以查看Java进程

[root@node1 hadoop-2.7.3]# jps
1446 NameNode
1831 Jps
1722 SecondaryNameNode
1564 DataNode

jps(Java Virtual Machine Process Status Tool)是JDK 1.5开始提供的一个显示当前所有Java进程pid的命令，简单实用，非常适合在Linux/unix平台上简单察看当前java进程的一些简单情况。

jps -l输出应用程序main class的完整package名或者应用程序的jar文件完整路径名

[root@node1 hadoop-2.7.3]# jps -l
1446 org.apache.hadoop.hdfs.server.namenode.NameNode
1722 org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode
1564 org.apache.hadoop.hdfs.server.datanode.DataNode
1870 sun.tools.jps.Jps

启动YARN

通过命令sbin/start-yarn.sh启动YARN

[root@node1 hadoop-2.7.3]# sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /opt/hadoop-2.7.3/logs/yarn-root-resourcemanager-node1.out
root@node1's password: 
node1: starting nodemanager, logging to /opt/hadoop-2.7.3/logs/yarn-root-nodemanager-node1.out

然后通过jps查看YARN的进程

[root@node1 hadoop-2.7.3]# jps
2209 NodeManager
1446 NameNode
1926 ResourceManager
2311 Jps
1722 SecondaryNameNode
1564 DataNode
[root@node1 hadoop-2.7.3]#