第2章 Hadoop快速入门
2.4 Hadoop单机运行
紧接上一节内容，首先切换到Hadoop根目录
或者cd /opt/hadoop-2.7.3进入Hadoop根目录
通过pwd命令可以知道当前所在目录
[root@node1 hadoop-2.7.3]# pwd
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注意：本节命令都将在/opt/hadoop-2.7.3目录下执行。
2.4.1 namenode格式化
执行bin/hadoop namenode -format命令，进行namenode格式化
[root@node1 hadoop-2.7.3]# bin/hadoop namenode -format
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输出信息(下半部分)：
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05:
59:
11 INFO namenode
.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
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11 INFO namenode
.NameNode: createNameNode [-format]
-
Formatting using clusterid: CID-db9a34c9-
661e-4fc0-a273-b554e0cfb32b
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05:
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12 INFO namenode
.FSNamesystem: No KeyProvider found.
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05:
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12 INFO namenode
.FSNamesystem: fsLock is fair:true
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12
05:
59:
12 INFO blockmanagement
.DatanodeManager: dfs
.block
.invalidate
.limit=
1000
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05:
59:
12 INFO blockmanagement
.DatanodeManager: dfs
.namenode
.datanode
.registration
.ip-hostname-
check=
true
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05:
59:
12 INFO blockmanagement
.BlockManager: dfs
.namenode
.startup
.delay
.block
.deletion
.sec
is
set
to
000:
00:
00:
00.000
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05:
59:
12 INFO blockmanagement
.BlockManager: The
block deletion will
start around
2017 May
12
05:
59:
12
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12
05:
59:
12 INFO util
.GSet: Computing
capacity
for
map BlocksMap
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12
05:
59:
12 INFO util
.GSet: VM
type =
64-
bit
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12
05:
59:
12 INFO util
.GSet:
2.0%
max
memory
966.7 MB =
19.3 MB
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12
05:
59:
12 INFO util
.GSet:
capacity =
2^
21 =
2097152 entries
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12
05:
59:
12 INFO blockmanagement
.BlockManager: dfs
.block
.access
.token
.enable=
false
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05:
59:
12 INFO blockmanagement
.BlockManager: defaultReplication =
1
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05:
59:
12 INFO blockmanagement
.BlockManager: maxReplication =
512
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05:
59:
12 INFO blockmanagement
.BlockManager: minReplication =
1
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05:
59:
12 INFO blockmanagement
.BlockManager: maxReplicationStreams =
2
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05:
59:
12 INFO blockmanagement
.BlockManager: replicationRecheckInterval =
3000
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05:
59:
12 INFO blockmanagement
.BlockManager: encryptDataTransfer =
false
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05:
59:
12 INFO blockmanagement
.BlockManager: maxNumBlocksToLog =
1000
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05:
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12 INFO namenode
.FSNamesystem: fsOwner = root (auth:SIMPLE)
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05:
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12 INFO namenode
.FSNamesystem: supergroup = supergroup
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05:
59:
12 INFO namenode
.FSNamesystem: isPermissionEnabled =
true
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05:
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12 INFO namenode
.FSNamesystem: HA Enabled:
false
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05:
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12 INFO namenode
.FSNamesystem: Append Enabled:
true
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12
05:
59:
13 INFO util
.GSet: Computing
capacity
for
map INodeMap
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12
05:
59:
13 INFO util
.GSet: VM
type =
64-
bit
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12
05:
59:
13 INFO util
.GSet:
1.0%
max
memory
966.7 MB =
9.7 MB
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12
05:
59:
13 INFO util
.GSet:
capacity =
2^
20 =
1048576 entries
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12
05:
59:
13 INFO namenode
.FSDirectory: ACLs enabled?
false
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05:
59:
13 INFO namenode
.FSDirectory: XAttrs enabled?
true
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05:
59:
13 INFO namenode
.FSDirectory: Maximum
size
of an xattr:
16384
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05:
59:
13 INFO namenode
.NameNode:
Caching
file
names occuring more
than
10 times
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12
05:
59:
13 INFO util
.GSet: Computing
capacity
for
map cachedBlocks
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12
05:
59:
13 INFO util
.GSet: VM
type =
64-
bit
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12
05:
59:
13 INFO util
.GSet:
0.25%
max
memory
966.7 MB =
2.4 MB
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12
05:
59:
13 INFO util
.GSet:
capacity =
2^
18 =
262144 entries
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12
05:
59:
13 INFO namenode
.FSNamesystem: dfs
.namenode
.safemode
.threshold-pct =
0.9990000128746033
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05:
59:
13 INFO namenode
.FSNamesystem: dfs
.namenode
.safemode
.min
.datanodes =
0
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05:
59:
13 INFO namenode
.FSNamesystem: dfs
.namenode
.safemode
.extension =
30000
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05:
59:
13 INFO metrics
.TopMetrics: NNTop conf: dfs
.namenode
.top
.window
.num
.buckets =
10
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05:
59:
13 INFO metrics
.TopMetrics: NNTop conf: dfs
.namenode
.top
.num
.users =
10
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12
05:
59:
13 INFO metrics
.TopMetrics: NNTop conf: dfs
.namenode
.top
.windows
.minutes =
1,
5,
25
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05:
59:
13 INFO namenode
.FSNamesystem: Retry
cache
on namenode
is enabled
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05:
59:
13 INFO namenode
.FSNamesystem: Retry
cache will
use
0.03
of total
heap
and retry
cache entry expiry
time
is
600000 millis
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12
05:
59:
13 INFO util
.GSet: Computing
capacity
for
map NameNodeRetryCache
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12
05:
59:
13 INFO util
.GSet: VM
type =
64-
bit
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12
05:
59:
13 INFO util
.GSet:
0.029999999329447746%
max
memory
966.7 MB =
297.0 KB
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12
05:
59:
13 INFO util
.GSet:
capacity =
2^
15 =
32768 entries
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05:
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13 INFO namenode
.FSImage: Allocated
new BlockPoolId: BP
-
2055065474
-
192.168
.80
.131
-
1494583153319
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05:
59:
13 INFO common
.Storage:
Storage
directory /tmp/hadoop-root/dfs/
name has been successfully formatted.
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05:
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13 INFO namenode
.FSImageFormatProtobuf: Saving image
file /tmp/hadoop-root/dfs/
name/
current/fsimage
.ckpt_0000000000000000000
using
no compression
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12
05:
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13 INFO namenode
.FSImageFormatProtobuf: Image
file /tmp/hadoop-root/dfs/
name/
current/fsimage
.ckpt_0000000000000000000
of
size
351
bytes saved
in
0 seconds.
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05:
59:
13 INFO namenode
.NNStorageRetentionManager: Going
to retain
1 images
with txid >=
0
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05:
59:
13 INFO util
.ExitUtil: Exiting
with
status
0
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05:
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13 INFO namenode
.NameNode: SHUTDOWN_MSG:
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/************************************************************
-
SHUTDOWN_MSG: Shutting down NameNode at node1/192.168.80.131
-
************************************************************/
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在执行结果中可以找到has been successfully formatted，说明namenode格式化成功了！
2.4.2 启动HDFS
执行sbin/start-dfs.sh命令启动HDFS
-
[root@node1 hadoop
-
2.7
.3]
# sbin/start-dfs.sh
-
Starting namenodes
on [node1]
-
node1: starting namenode, logging
to /opt/hadoop
-
2.7
.3/logs/hadoop-root-namenode-node1.out
-
localhost: starting datanode, logging
to /opt/hadoop
-
2.7
.3/logs/hadoop-root-datanode-node1.out
-
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 e2:
9a:
7d:
70:
25:
24:
45:
11:
97:
12:
35:e0:
45:
4c:
64:
31.
-
Are you sure you want
to
continue connecting (yes/no)? yes
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0.0
.0
.0: Warning: Permanently added
'
0.0
.0
.0
' (ECDSA)
to
the
list
of
known hosts.
-
0.0
.0
.0: starting secondarynamenode, logging
to /opt/hadoop
-
2.7
.3/logs/hadoop-root-secondarynamenode-node1.out
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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
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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 ~]
# jps -l
-
5752
sun
.tools
.jps
.Jps
-
5342
org
.apache
.hadoop
.hdfs
.server
.namenode
.NameNode
-
5440
org
.apache
.hadoop
.hdfs
.server
.datanode
.DataNode
-
5630
org
.apache
.hadoop
.hdfs
.server
.namenode
.SecondaryNameNode
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2.4.3 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
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localhost: starting nodemanager, logging
to /opt/hadoop-
2.7
.3/logs/yarn-root-nodemanager-node1
.out
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然后通过jps查看YARN的进程
-
[root
@node1 hadoop-
2.7.
3]
# jps
-
5440
DataNode
-
7253
ResourceManager
-
7351
NodeManager
-
5342
NameNode
-
5630
SecondaryNameNode
-
7662
Jps
-
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[root
@node1 hadoop-
2.7.
3]
#
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可以看到多了ResourceManager和NodeManager两个进程。
2.4.4 HDFS WEB界面
HDFS的Web界面默认端口号是50070。
因为宿主机Windows的hosts文件没有配置虚拟机相关IP信息，所以需要通过IP地址来访问HDFS WEB界面，在浏览器中打开:http://192.168.80.131:50070
单击页面上部的导航栏中的“Datanodes” 
2.4.5 YARN WEB界面
YARN的Web界面默认端口号是8088。
http://192.168.80.131:8088
单击左侧菜单栏的“Nodes”，可以查看NodeManager信息
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