一、hadoop安装（本地模式及伪分布式安装）
hadoop历史版本下载网站：http://archive.apache.org/dist/
运行模式：
本地模式
yarn模式
hadoop组成：
common：基本组件、命令
hdfs：分布式文件系统，安全（默认副本集）
yarn：数据操作系统（性质相当于linux OS）
mapreduce：分布式计算框架
input -> map -> shuffer -> reduce -> output
1、安装配置jdk开发环境
[iyunv@db01 mnt]#tar -zxvf jdk-7u67-linux-x64.tar.gz
[iyunv@db01 mnt]#mkdir /usr/java
[iyunv@db01 mnt]#mv jdk1.7.0_67/ /usr/java/
[iyunv@db01 mnt]#vim /etc/profile
export JAVA_HOME=/usr/java/jdk1.7.0_67
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export>[iyunv@db01 mnt]#source /etc/profile
[iyunv@db01 mnt]# java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
-----jdk配置成功---------------------------
2、安装hadoop软件
[iyunv@db01 mnt]#tar -zxvf hadoop-2.5.0.tar.gz
[iyunv@db01 mnt]#mv /mnt/hadoop-2.5.0 /usr/local/hadoop-2.5.0/
[iyunv@db01 mnt]#chown -R hadoop:hadoop /usr/local/hadoop-2.5.0/
3、测试
[hadoop@db01 hadoop-2.5.0]$bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar grep input output 'dfs[a-z.]+'
[hadoop@db01 hadoop-2.5.0]$mkdir wcinput
[hadoop@db01 hadoop-2.5.0]$cd wcinput/
[hadoop@db01 hadoop-2.5.0]$touch wc.input
[hadoop@db01 hadoop-2.5.0]$vim wc.input
hadoop yarn
hadoop mapreduce
hadoop hdfs
yarn nodemanager
hadoop resourcemanager
[hadoop@db01 hadoop-2.5.0]$cd ../
[hadoop@db01 hadoop-2.5.0]$bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount wcinput wcoutput
4、编辑配置文件，配置hdfs
[hadoop@db01 hadoop-2.5.0]$vim etc/hadoop/hadoop-env.sh
export JAVA_HOME=/usr/java/jdk1.7.0_67
[hadoop@db01 hadoop-2.5.0]$mkdir -p data/tmp
[hadoop@db01 hadoop-2.5.0]$vim etc/hadoop/core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://db01:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop-2.5.0/data/tmp</value>
</property>
</configuration>
[hadoop@db01 hadoop-2.5.0]$vim etc/hadoop/hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
5、格式化hdfs系统
[hadoop@db01 hadoop-2.5.0]$bin/hdfs namenode -format
6、分别启动namenode和datanode节点
[hadoop@db01 hadoop-2.5.0]$sbin/hadoop-daemon.sh start namenode
[hadoop@db01 hadoop-2.5.0]$sbin/hadoop-daemon.sh start datanode
7、浏览器访问hdfs系统
网址：http://db01:50070/
8、创建hdfs下的工作目录，在hdfs上测试wordcount功能
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -mkdir -p /user/hadoop/
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -ls -R /
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -mkdir -p /user/hadoop/mapreduce/wordcount/input
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -put wcinput/wc.input /user/hadoop/mapreduce/wordcount/input/
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -cat /user/hadoop/mapreduce/wordcount/input/wc.input
[hadoop@db01 hadoop-2.5.0]$bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoop/mapreduce/wordcount/input/ /user/hadoop/mapreduce/wordcount/output/
[hadoop@db01 hadoop-2.5.0]$bin/hdfs dfs -cat /user/hadoop/mapreduce/wordcount/output/part-r-00000
9、配置yarn
[hadoop@db01 hadoop-2.5.0]$ vim etc/hadoop/yarn-env.sh
export JAVA_HOME=/usr/java/jdk1.7.0_67
[hadoop@db01 hadoop-2.5.0]$ vim etc/hadoop/yarn-site.xml
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>db01</value>
</property>
</configuration>
[hadoop@db01 hadoop-2.5.0]$ vim etc/hadoop/slaves
db01
10、启动yarn
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh start resourcemanager
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh start nodemanager
[hadoop@db01 hadoop-2.5.0]$ jps
14573 NodeManager
13490 DataNode
13400 NameNode
14685 Jps
14315 ResourceManager
11、浏览器进入yarn监控
http://db01:8088
12、配置mapreduce
[hadoop@db01 hadoop-2.5.0]$ vim etc/hadoop/mapred-env.sh
export JAVA_HOME=/usr/java/jdk1.7.0_67
[hadoop@db01 hadoop-2.5.0]$ cp etc/hadoop/mapred-site.xml.template etc/hadoop/mapred-site.xml
[hadoop@db01 hadoop-2.5.0]$ vim etc/hadoop/mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
13、测试wordcount
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -rm -R /user/hadoop/mapreduce/wordcount/output/
17/03/01 17:16:03 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> 17/03/01 17:16:04 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes.
Deleted /user/hadoop/mapreduce/wordcount/output
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -ls -R /
17/03/01 17:16:28 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> drwxr-xr-x - hadoop supergroup 0 2017-03-01 16:04 /user
drwxr-xr-x - hadoop supergroup 0 2017-03-01 16:07 /user/hadoop
drwxr-xr-x - hadoop supergroup 0 2017-03-01 16:07 /user/hadoop/mapreduce
drwxr-xr-x - hadoop supergroup 0 2017-03-01 17:16 /user/hadoop/mapreduce/wordcount
drwxr-xr-x - hadoop supergroup 0 2017-03-01 16:08 /user/hadoop/mapreduce/wordcount/input
-rw-r--r-- 1 hadoop supergroup 81 2017-03-01 16:08 /user/hadoop/mapreduce/wordcount/input/wc.input
[hadoop@db01 hadoop-2.5.0]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoop/mapreduce/wordcount/input/ /user/hadoop/mapreduce/wordcount/output/
17/03/01 17:18:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> 17/03/01 17:18:09 INFO client.RMProxy: Connecting to ResourceManager at db01/192.168.100.231:8032
17/03/01 17:18:10 INFO input.FileInputFormat: Total input paths to process : 1
17/03/01 17:18:10 INFO mapreduce.JobSubmitter: number of splits:1
17/03/01 17:18:10 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1488358618376_0001
17/03/01 17:18:11 INFO impl.YarnClientImpl: Submitted application application_1488358618376_0001
17/03/01 17:18:11 INFO mapreduce.Job: The url to track the job: http://db01:8088/proxy/application_1488358618376_0001/
17/03/01 17:18:11 INFO mapreduce.Job: Running job: job_1488358618376_0001
17/03/01 17:18:19 INFO mapreduce.Job: Job job_1488358618376_0001 running in uber mode : false
17/03/01 17:18:19 INFO mapreduce.Job: map 0% reduce 0%
17/03/01 17:18:25 INFO mapreduce.Job: map 100% reduce 0%
17/03/01 17:18:31 INFO mapreduce.Job: map 100% reduce 100%
17/03/01 17:18:31 INFO mapreduce.Job: Job job_1488358618376_0001 completed successfully
17/03/01 17:18:31 INFO mapreduce.Job: Counters: 49
File System Counters
FILE: Number of bytes read=97
FILE: Number of bytes written=194147
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=209
HDFS: Number of bytes written=67
HDFS: Number of read operations=6
HDFS: Number of large read operations=0
HDFS: Number of write operations=2
Job Counters
Launched map tasks=1
Launched reduce tasks=1
Data-local map tasks=1
Total time spent by all maps in occupied slots (ms)=3516
Total time spent by all reduces in occupied slots (ms)=3823
Total time spent by all map tasks (ms)=3516
Total time spent by all reduce tasks (ms)=3823
Total vcore-seconds taken by all map tasks=3516
Total vcore-seconds taken by all reduce tasks=3823
Total megabyte-seconds taken by all map tasks=3600384
Total megabyte-seconds taken by all reduce tasks=3914752
Map-Reduce Framework
Map input records=5
Map output records=10
Map output bytes=121
Map output materialized bytes=97
Input split bytes=128
Combine input records=10
Combine output records=6
Reduce input groups=6
Reduce shuffle bytes=97
Reduce input records=6
Reduce output records=6
Spilled Records=12
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=47
CPU time spent (ms)=1690
Physical memory (bytes) snapshot=411054080
Virtual memory (bytes) snapshot=1784795136
Total committed heap usage (bytes)=275251200
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
File Input Format Counters
Bytes Read=81
File Output Format Counters
Bytes Written=67
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -ls -R /user/hadoop/mapreduce/wordcount/output/
17/03/01 17:19:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> -rw-r--r-- 1 hadoop supergroup 0 2017-03-01 17:18 /user/hadoop/mapreduce/wordcount/output/_SUCCESS
-rw-r--r-- 1 hadoop supergroup 67 2017-03-01 17:18 /user/hadoop/mapreduce/wordcount/output/part-r-00000
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -cat /user/hadoop/mapreduce/wordcount/output/part-r-00000
17/03/01 17:20:58 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> hadoop 4
hdfs 1
mapreduce 1
nodemanager 1
resourcemanager 1
yarn 2
14、yarn测试wordcount(输出文件夹不能存在，否则会报错)
[hadoop@db01 hadoop-2.5.0]$ bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoop/mapreduce/wordcount/input/ /user/hadoop/mapreduce/wordcount/output2/
17/03/01 17:43:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> 17/03/01 17:43:09 INFO client.RMProxy: Connecting to ResourceManager at db01/192.168.100.231:8032
17/03/01 17:43:10 INFO input.FileInputFormat: Total input paths to process : 1
17/03/01 17:43:10 INFO mapreduce.JobSubmitter: number of splits:1
17/03/01 17:43:10 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1488358618376_0002
17/03/01 17:43:11 INFO impl.YarnClientImpl: Submitted application application_1488358618376_0002
17/03/01 17:43:11 INFO mapreduce.Job: The url to track the job: http://db01:8088/proxy/application_1488358618376_0002/
17/03/01 17:43:11 INFO mapreduce.Job: Running job: job_1488358618376_0002
17/03/01 17:43:18 INFO mapreduce.Job: Job job_1488358618376_0002 running in uber mode : false
17/03/01 17:43:18 INFO mapreduce.Job: map 0% reduce 0%
17/03/01 17:43:23 INFO mapreduce.Job: map 100% reduce 0%
17/03/01 17:43:29 INFO mapreduce.Job: map 100% reduce 100%
17/03/01 17:43:30 INFO mapreduce.Job: Job job_1488358618376_0002 completed successfully
17/03/01 17:43:30 INFO mapreduce.Job: Counters: 49
File System Counters
FILE: Number of bytes read=97
FILE: Number of bytes written=194149
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=209
HDFS: Number of bytes written=67
HDFS: Number of read operations=6
HDFS: Number of large read operations=0
HDFS: Number of write operations=2
Job Counters
Launched map tasks=1
Launched reduce tasks=1
Data-local map tasks=1
Total time spent by all maps in occupied slots (ms)=3315
Total time spent by all reduces in occupied slots (ms)=3460
Total time spent by all map tasks (ms)=3315
Total time spent by all reduce tasks (ms)=3460
Total vcore-seconds taken by all map tasks=3315
Total vcore-seconds taken by all reduce tasks=3460
Total megabyte-seconds taken by all map tasks=3394560
Total megabyte-seconds taken by all reduce tasks=3543040
Map-Reduce Framework
Map input records=5
Map output records=10
Map output bytes=121
Map output materialized bytes=97
Input split bytes=128
Combine input records=10
Combine output records=6
Reduce input groups=6
Reduce shuffle bytes=97
Reduce input records=6
Reduce output records=6
Spilled Records=12
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=38
CPU time spent (ms)=1690
Physical memory (bytes) snapshot=400715776
Virtual memory (bytes) snapshot=1776209920
Total committed heap usage (bytes)=274202624
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
File Input Format Counters
Bytes Read=81
File Output Format Counters
Bytes Written=67
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -cat /user/hadoop/mapreduce/wordcount/output2/
17/03/01 17:44:11 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> cat: `/user/hadoop/mapreduce/wordcount/output2': Is a directory
[hadoop@db01 hadoop-2.5.0]$
[hadoop@db01 hadoop-2.5.0]$
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -cat /user/hadoop/mapreduce/wordcount/output2/part*
17/03/01 17:44:40 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> hadoop 4
hdfs 1
mapreduce 1
nodemanager 1
resourcemanager 1
yarn 2
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -text /user/hadoop/mapreduce/wordcount/output2/part*
17/03/01 17:47:38 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> hadoop 4
hdfs 1
mapreduce 1
nodemanager 1
resourcemanager 1
yarn 2
注意：mapreduce会对默认结果进行排序。
15、启动mapreduce历史服务器
[hadoop@db01 hadoop-2.5.0]$ sbin/mr-jobhistory-daemon.sh start historyserver
starting historyserver, logging to /usr/local/hadoop-2.5.0/logs/mapred-hadoop-historyserver-db01.out
[hadoop@db01 hadoop-2.5.0]$ jps
14573 NodeManager
13490 DataNode
13400 NameNode
14315 ResourceManager
16366 Jps
16296 JobHistoryServer
16、启用yarn日志的聚集（Aggregation）功能
聚集：在mapreduce任务完成后，将日志信息上床到hdfs上。
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/yarn-site.xml
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>db01</value>
</property>
##开启日志聚集功能
<property>
<name>yarn.log-aggregation-enable</name>
<value>true</value>
</property>
##日志保存7天（单位秒）
<property>
<name>yarn.log-aggregation.retain-seconds</name>
<value>600000</value>
</property>
</configuration>
----------重启yarn服务及historyserver服务：
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh stop resourcemanager
stopping resourcemanager
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh stop nodemanager
stopping nodemanager
nodemanager did not stop gracefully after 5 seconds: killing with kill -9
[hadoop@db01 hadoop-2.5.0]$ jps
13490 DataNode
13400 NameNode
16511 Jps
16296 JobHistoryServer
[hadoop@db01 hadoop-2.5.0]$ sbin/mr-jobhistory-daemon.sh stop historyserver
stopping historyserver
[hadoop@db01 hadoop-2.5.0]$ jps
13490 DataNode
13400 NameNode
16548 Jps
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /usr/local/hadoop-2.5.0/logs/yarn-hadoop-resourcemanager-db01.out
[hadoop@db01 hadoop-2.5.0]$ sbin/yarn-daemon.sh start nodemanager
starting nodemanager, logging to /usr/local/hadoop-2.5.0/logs/yarn-hadoop-nodemanager-db01.out
[hadoop@db01 hadoop-2.5.0]$ sbin/mr-jobhistory-daemon.sh start historyserver
starting historyserver, logging to /usr/local/hadoop-2.5.0/logs/mapred-hadoop-historyserver-db01.out
[hadoop@db01 hadoop-2.5.0]$ jps
16584 ResourceManager
13490 DataNode
13400 NameNode
16834 NodeManager
16991 JobHistoryServer
17028 Jps
[hadoop@db01 hadoop-2.5.0]$
17、重新运行wordcount任务，测试yarn日志聚集功能：
[hadoop@db01 hadoop-2.5.0]$ bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoop/mapreduce/wordcount/input/ /user/hadoop/mapreduce/wordcount/output3/
浏览器（http://db01:8088/）查看日志信息：
Log Type: stderr
Log Length: 0
Log Type: stdout
Log Length: 0
Log Type: syslog
Log Length: 3816
2017-03-01 18:36:45,873 WARN [main] org.apache.hadoop.conf.Configuration: job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.
2017-03-01 18:36:45,911 WARN [main] org.apache.hadoop.conf.Configuration: job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.
2017-03-01 18:36:46,130 WARN [main] org.apache.hadoop.util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> 2017-03-01 18:36:46,239 INFO [main] org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2017-03-01 18:36:46,319 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2017-03-01 18:36:46,319 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system started
2017-03-01 18:36:46,335 INFO [main] org.apache.hadoop.mapred.YarnChild: Executing with tokens:
2017-03-01 18:36:46,335 INFO [main] org.apache.hadoop.mapred.YarnChild: Kind: mapreduce.job, Service: job_1488364479714_0001,> 2017-03-01 18:36:46,427 INFO [main] org.apache.hadoop.mapred.YarnChild: Sleeping for 0ms before retrying again. Got null now.
2017-03-01 18:36:46,732 INFO [main] org.apache.hadoop.mapred.YarnChild: mapreduce.cluster.local.dir for child: /usr/local/hadoop-2.5.0/data/tmp/nm-local-dir/usercache/hadoop/appcache/application_1488364479714_0001
2017-03-01 18:36:46,863 WARN [main] org.apache.hadoop.conf.Configuration: job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.
2017-03-01 18:36:46,878 WARN [main] org.apache.hadoop.conf.Configuration: job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.
2017-03-01 18:36:47,202 INFO [main] org.apache.hadoop.conf.Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
2017-03-01 18:36:47,668 INFO [main] org.apache.hadoop.mapred.Task: Using ResourceCalculatorProcessTree : [ ]
2017-03-01 18:36:47,873 INFO [main] org.apache.hadoop.mapred.MapTask: Processing split: hdfs://db01:9000/user/hadoop/mapreduce/wordcount/input/wc.input:0+81
2017-03-01 18:36:47,887 INFO [main] org.apache.hadoop.mapred.MapTask: Map output collector> 2017-03-01 18:36:47,953 INFO [main] org.apache.hadoop.mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
2017-03-01 18:36:47,953 INFO [main] org.apache.hadoop.mapred.MapTask: mapreduce.task.io.sort.mb: 100
2017-03-01 18:36:47,953 INFO [main] org.apache.hadoop.mapred.MapTask: soft limit at 83886080
2017-03-01 18:36:47,953 INFO [main] org.apache.hadoop.mapred.MapTask: bufstart = 0; bufvoid = 104857600
2017-03-01 18:36:47,953 INFO [main] org.apache.hadoop.mapred.MapTask: kvstart = 26214396; length = 6553600
2017-03-01 18:36:47,989 INFO [main] org.apache.hadoop.mapred.MapTask: Starting flush of map output
2017-03-01 18:36:47,989 INFO [main] org.apache.hadoop.mapred.MapTask: Spilling map output
2017-03-01 18:36:47,990 INFO [main] org.apache.hadoop.mapred.MapTask: bufstart = 0; bufend = 121; bufvoid = 104857600
2017-03-01 18:36:47,990 INFO [main] org.apache.hadoop.mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214360(104857440); length = 37/6553600
2017-03-01 18:36:48,002 INFO [main] org.apache.hadoop.mapred.MapTask: Finished spill 0
2017-03-01 18:36:48,008 INFO [main] org.apache.hadoop.mapred.Task: Task:attempt_1488364479714_0001_m_000000_0 is done. And is in the process of committing
2017-03-01 18:36:48,106 INFO [main] org.apache.hadoop.mapred.Task: Task 'attempt_1488364479714_0001_m_000000_0' done.
18、hadoop配置文件
默认配置文件：四个模块相对应的jar包中
*core-default.xml
*hdfs-default.xml
*yarn-default.xml
*mapred-default.xml
用户自定义配置文件：$HADOOP_HOME/etc/hadoop/
*core-site.xml
*hdfs-site.xml
*yarn-site.xml
*mapred-site.xml
19、开启hdfs回收站功能
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://db01:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop-2.5.0/data/tmp</value>
</property>
##开启回收站功能，设置保存7天删除数据信息
<property>
<name>fs.trash.interval</name>
<value>7 * 24 * 60</value>
</property>
</configuration>
重启生效：
20、hadoop的3种启动/关闭方式
*各个服务器逐一启动（比较常用，编写shell脚本）
hdfs：
sbin/hadoop-daemon.sh start|stop namenode
sbin/hadoop-daemon.sh start|stop datanode
sbin/hadoop-daemon.sh start|stop secondarynamenode
yarn:
sbin/yarn-daemon.sh start|stop resourcemanager
sbin/yarn-daemon.sh start|stop nodemanager
mapreduce:
sbin/mr-jobhistory-daemon.sh start|stop historyserver
*各个模块分开启动:需要配置ssh对等性，需要在namenode上运行
hdfs:
sbin/start-dfs.sh
sbin/start-yarn.sh
yarn:
sbin/stop-dfs.sh
sbin/stop-yarn.sh
*全部启动:不建议使用，这个命令需要在namenode上运行，但是会同时叫secondaryname节点也启动到namenode节点
sbin/start-all.sh
sbin/stop-all.sh
附加：配置ssh对等性
[hadoop@db01 ~]$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
[hadoop@db01 ~]$ scp .ssh/authorized_keys db02:/home/hadoop/.ssh/authorized_keys
21、hadoop角色
namenode:参数值hdfs://db01:9000决定
core-site.xml
##以下参数确定namenode节点
<property>
<name>fs.defaultFS</name>
<value>hdfs://db01:9000</value>
</property>
datanode：slaves文件内容决定
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/slaves
db01
secondarynamenode：参数dfs.namenode.secondary.http-address决定
hdfs-site.xml
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>db01:50090</value>
</property>
resourcemanager：
yarn-site.xml
<property>
<name>yarn.resourcemanager.hostname</name>
<value>db01</value>
</property>
nodemanager：
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/slaves
db01
jobhistoryserver：
mapred-site.xml
<property>
<name>mapreduce.jobhistory.address</name>
<value>db01:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>db01:19888</value>
</property>
22、问题
[hadoop@db01 hadoop-2.5.0]$ bin/hdfs dfs -ls
17/03/01 21:50:33 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> Found 1 items -------------------------------------------------------------->这个警告需要源码替换lib/native包才能消除
drwxr-xr-x - hadoop supergroup 0 2017-03-01 16:07 mapreduce
23、附加：配置文件
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/core-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://db01:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop-2.5.0/data/tmp</value>
</property>
<property>
<name>fs.trash.interval</name>
<value>7000</value>
</property>
</configuration>
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>db01:50090</value>
</property>
</configuration>
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/yarn-site.xml
<?xml version="1.0"?>
<!--
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>db01</value>
</property>
<property>
<name>yarn.log-aggregation-enable</name>
<value>true</value>
</property>
<property>
<name>yarn.log-aggregation.retain-seconds</name>
<value>600000</value>
</property>
</configuration>
[hadoop@db01 hadoop-2.5.0]$ cat etc/hadoop/mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>db01:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>db01:19888</value>
</property>
</configuration>
另外注意需要在各个配置文件中定义java环境变量 | 
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