進程
------------------
[hdfs]start-dfs.sh
NameNode NN
DataNode DN
SecondaryNamenode 2NN

[yarn]start-yarn.sh
ResourceMananger RM
NodeManager NM

腳本分析
-------------------
sbin/start-all.sh
--------------
　　libexec/hadoop-config.sh
　　start-dfs.sh
　　start-yarn.sh

　　sbin/start-dfs.sh
--------------
　　libexec/hadoop-config.sh
　　sbin/hadoop-daemons.sh --config .. --hostname .. start namenode ...
　　sbin/hadoop-daemons.sh --config .. --hostname .. start datanode ...
　　sbin/hadoop-daemons.sh --config .. --hostname .. start sescondarynamenode ...
　　sbin/hadoop-daemons.sh --config .. --hostname .. start zkfc ... //

sbin/start-yarn.sh
--------------
　　libexec/yarn-config.sh
　　bin/yarn-daemon.sh start resourcemanager
　　bin/yarn-daemons.sh start nodemanager

sbin/hadoop-daemons.sh
----------------------
　　libexec/hadoop-config.sh

　　slaves

　　hadoop-daemon.sh

sbin/hadoop-daemon.sh
-----------------------
　　libexec/hadoop-config.sh
　　bin/hdfs ....

sbin/yarn-daemon.sh
-----------------------
　　libexec/yarn-config.sh
　　bin/yarn

bin/hadoop
------------------------
　　hadoop verion //版本
　　hadoop fs //文件系統客戶端.
　　hadoop jar //
　　hadoop classpath
　　hadoop checknative

bin/hdfs
------------------------
dfs // === hadoop fs
classpath
namenode -format
secondarynamenode
namenode
journalnode
zkfc
datanode
dfsadmin
haadmin
fsck
balancer
jmxget
mover

oiv
oiv_legacy
oev
fetchdt
getconf
groups
snapshotDiff

lsSnapshottableDir

portmap
nfs3
cacheadmin
crypto
storagepolicies
version

hdfs常用命令
--------------------
$>hdfs dfs -mkdir /user/centos/hadoop
$>hdfs dfs -ls -r /user/centos/hadoop
$>hdfs dfs -lsr /user/centos/hadoop
$>hdfs dfs -put index.html /user/centos/hadoop
$>hdfs dfs -get /user/centos/hadoop/index.html a.html
$>hdfs dfs -rm -r -f /user/centos/hadoop

hadoop啟動腳本分析及常見命令