Hadoop2.x 伪分布式
2019-03-04 本文已影响0人
Miracle001
简介
Big data:
结构化数据：约束
半结构化数据
非结构化数据：没有元数据
日志数据是非结构化数据
搜索引擎：搜索组件、索引组件
爬虫、蜘蛛程序--爬取数据是非结构化、半结构化
分词器
存储
分析处理
google的三篇论文：
GFS 2003年 The Google File System
MapReduce 2004年 Simplified Data Processing On Large Cluster
BigTable 2006年 A Distributed Storage System for Structure Data
山寨版：
HDFS
MapReduce
HBase
HDFS + MapReduce = Hadoop
Nutch爬取数据-->loosen:数据越大，处理速度越慢；想解决方案--google的论文发布
MapReduce是批处理程序，速度和性能差
NAS,SAN 共享存储
存储系统只有一个，io压力过大，不适用； 集中式传统的解决方案
分布式存储
有中心节点 有元数据存储 GFS/HDFS
无中心节点
NN:NameNode
SNN:Secondary 第二节点，避免NN down掉后，重读数据文件，耗时过长
数据持久化--事务日志-->image--磁盘镜像，保证元数据不丢失；
Hadoop2.0后使用zookeeper高可用，元数据存放在共享存储NFS上。
DN:DataNode
数据副本，保证数据完整；
heartbeat
数据块列表:
数据为中心，存在哪些节点上；
节点为中心，有哪些数据块；
Job Tracker TaskTracker
数据在哪--程序就在哪
namenode 和 jobe tracker 在一起，容易造成系统瓶颈
datanote 和 tasktracker 在一起
函数式编程
把一个函数当成另一个函数的参数
Lisp,ML函数式编程语言：高级函数：
map, fold
map:
map(f())
map：接受一个函数为参数，并将其应用于列表中的所有元素，从而生产一个结果列表；
fold:
接受两个参数：函数，初始值
fold(g(), init)
mapreduce:
mapper, reducer
shuffle and sort 整理传输和排序
k-v 数据
同一个键只能发往同一个reducer
可能会mapreduce多次
mapper-->combiner-->partitioner--reduccer
mapper 和 reducer 输入、输出的键不同
combiner 输入、输出的键相同
MRv1(hadoop1)-->MRv2(hadoop2)
MRv1：Cluster resource manager, Data processing
MRv2：
YARN：Cluster resource manager
MRv2：Data processing
MR：batch 批处理
Tez：execution engine
RM resource manager
NM node ...
AM apply ...
container mr
如下图1
hadoop生态系统 如下图2
sqoop
从其他关系型数据库中抽取数据导入到Hadoop中；
将Hadoop中的数据抽取出来，结构化后，导入到关系型数据库中；
Flume
日志收集存储到Hadoop中
hive
pig
HBase 列式存储
数据序列化：把非流式化数据转化为流式化数据，而且还可以还原回来。
storm 数据统计和分析
Hadoop Distribution:
Cloudera：CDH
Hortonworks：HDP
商业版
Intel：IDH
MapR
单机模型：测试用，程序是否可以应用到Hadoop里
伪分布式模型：运行于单机
分布式模型：集群模型
Hadoop：基于Java语言
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Hadoop 伪分布式
centos 7 1804
NAT 192.168.25.14
仅主机 192.168.50.14
禁用防火墙
禁用selinux
yum -y install wget vim lrzsz net-tools ntpdate
yum -y install epel-release-latest-7.noarch.rpm
cat /etc/hosts
192.168.25.11 node1.fgq.com node1
192.168.25.12 node2.fgq.com node2
192.168.25.13 node3.fgq.com node3
192.168.25.14 node4.fgq.com node4
192.168.25.15 node5.fgq.com node5
crontab -e
*/5 * * * * ntpdate time3.aliyun.com && hwclock -w
[root@node4 ~]# mkdir -p /fgq/base-env/
[root@node4 ~]# cd /fgq/base-env/
下载jdk包 jdk-8u152-linux-x64.tar.gz
下载Hadoop包 hadoop-2.9.2.tar.gz
传到这个目录下，并解压
[root@node4 base-env]# tar zxf jdk-8u152-linux-x64.tar.gz
[root@node4 base-env]# tar zxf hadoop-2.9.2.tar.gz
[root@node4 base-env]# ln -s jdk1.8.0_152 jdk
[root@node4 base-env]# ln -s hadoop-2.9.2 hadoop
[root@node4 ~]# vim /etc/profile
最下面添加如下信息：
export JAVA_HOME=/fgq/base-env/jdk
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
[root@node4 ~]# source /etc/profile
[root@node4 ~]# java -version
java version "1.8.0_152"
Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)
[root@node4 ~]# vim /etc/profile.d/hadoop.sh
export HADOOP_HOME=/fgq/base-env/hadoop
export PATH=$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$PATH
export HADOOP_YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_MAPPERD_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
[root@node4 ~]# source /etc/profile.d/hadoop.sh
[root@node4 ~]# cd /fgq/base-env/hadoop
[root@node4 hadoop]# groupadd hadoop
[root@node4 hadoop]# useradd -g hadoop yarn
[root@node4 hadoop]# useradd -g hadoop hdfs
[root@node4 hadoop]# useradd -g hadoop mapred
[root@node4 hadoop]# mkdir -p /fgq/data/hadoop/hdfs/{nn,snn,dn}
[root@node4 hadoop]# chown -R hdfs:hadoop /fgq/data/hadoop/hdfs
[root@node4 hadoop]# ll /fgq/data/hadoop/hdfs
[root@node4 hadoop]# mkdir logs
[root@node4 hadoop]# chmod g+w logs 确保logs用户组有写权限
[root@node4 hadoop]# chown -R yarn:hadoop logs
[root@node4 hadoop]# chown -R yarn:hadoop ./*
[root@node4 hadoop]# ll
[root@node4 hadoop]# cd etc/hadoop/
[root@node4 hadoop]# vim core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://node4:8020</value>
<final>true</final>
</property>
</configuration>
[root@node4 hadoop]# vim hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:///fgq/data/hadoop/hdfs/nn</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:///fgq/data/hadoop/hdfs/dn</value>
</property>
<property>
<name>fs.checkpoint.dir</name>
<value>file:///fgq/data/hadoop/hdfs/snn</value>
</property>
<property>
<name>fs.checkpoint.edits.dir</name>
<value>file:///fgq/data/hadoop/hdfs/snn</value>
</property>
</configuration>
[root@node4 hadoop]# cp mapred-site.xml.template mapred-site.xml
[root@node4 hadoop]# vim mapred-site.xml
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
[root@node4 hadoop]# vim yarn-site.xml
<configuration>
<property>
<name>yarn.resourcemanager.address</name>
<value>node4:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>node4:8030</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>node4:8031</value>
</property>
<property>
<name>yarn.resourcemanager.admin.address</name>
<value>node4:8033</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>node4:8088</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.nodemanager.auxservices.mapreduce_shuffle.class</name>
<value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.class</name>
<value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler</value>
</property>
</configuration>
[root@node4 hadoop]# vim slaves
node4
[root@node4 hadoop]# su - hdfs
## 格式化
[hdfs@node4 ~]$ hdfs namenode -format
19/03/02 10:45:03 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = node4.fgq.com/192.168.25.14
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 2.9.2
... ...
19/03/02 10:45:05 INFO common.Storage: Storage directory /fgq/data/hadoop/hdfs/nn has been successfully formatted.
19/03/02 10:45:05 INFO namenode.FSImageFormatProtobuf: Saving image file /fgq/data/hadoop/hdfs/nn/current/fsimage.ckpt_0000000000000000000 using no compression
19/03/02 10:45:05 INFO namenode.FSImageFormatProtobuf: Image file /fgq/data/hadoop/hdfs/nn/current/fsimage.ckpt_0000000000000000000 of size 323 bytes saved in 0 seconds .
19/03/02 10:45:05 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
19/03/02 10:45:05 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at node4.fgq.com/192.168.25.14
************************************************************/
显示有 successfully 字样，表示OK
[hdfs@node4 ~]$ ls /fgq/data/hadoop/hdfs/nn/current/
fsimage_0000000000000000000 fsimage_0000000000000000000.md5 seen_txid VERSION
## 启动namenode
[hdfs@node4 ~]$ hadoop-daemon.sh start namenode
starting namenode, logging to /fgq/base-env/hadoop-2.9.2/logs/hadoop-hdfs-namenode-node4.fgq.com.out
[hdfs@node4 ~]$ less /fgq/base-env/hadoop-2.9.2/logs/hadoop-hdfs-namenode-node4.fgq.com.log
[hdfs@node4 ~]$ jps #java的ps命令查看进程
1769 NameNode
1851 Jps
[hdfs@node4 ~]$ jps -h
illegal argument: -h
usage: jps [-help]
jps [-q] [-mlvV] [<hostid>]
Definitions:
<hostid>: <hostname>[:<port>]
[hdfs@node4 ~]$ jps -v
1879 Jps -Denv.class.path=.:/fgq/base-env/jdk/lib/dt.jar:/fgq/base-env/jdk/lib/tools.jar -Dapplication.home=/fgq/base-env/jdk1.8.0_152 -Xms8m
1769 NameNode -Dproc_namenode -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/fgq/base-env/hadoop-2.9.2/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/fgq/base-env/hadoop-2.9.2 -Dhadoop.id.str=hdfs -Dhadoop.root.logger=INFO,console -Djava.library.path=/fgq/base-env/hadoop-2.9.2/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/fgq/base-env/hadoop-2.9.2/logs -Dhadoop.log.file=hadoop-hdfs-namenode-node4.fgq.com.log -Dhadoop.home.dir=/fgq/base-env/hadoop-2.9.2 -Dhadoop.id.str=hdfs -Dhadoop.root.logger=INFO,RFA -Djava.library.path=/fgq/base-env/hadoop-2.9.2/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS
## 启动secondarynamenode
[hdfs@node4 ~]$ hadoop-daemon.sh start secondarynamenode
starting secondarynamenode, logging to /fgq/base-env/hadoop-2.9.2/logs/hadoop-hdfs-secondarynamenode-node4.fgq.com.out
[hdfs@node4 ~]$ jps
1990 Jps
1769 NameNode
1945 SecondaryNameNode
## 启动datanode
[hdfs@node4 ~]$ hadoop-daemon.sh start datanode
starting datanode, logging to /fgq/base-env/hadoop-2.9.2/logs/hadoop-hdfs-datanode-node4.fgq.com.out
名称节点一般不作为数据节点，但此处是伪分布式
[hdfs@node4 ~]$ jps
1769 NameNode
1945 SecondaryNameNode
2073 DataNode
2155 Jps
[hdfs@node4 ~]$ hdfs dfs -ls / #根路径下没有目录，创建一个目录
[hdfs@node4 ~]$ hdfs dfs -mkdir /test
[hdfs@node4 ~]$ hdfs dfs -ls /
Found 1 items
drwxr-xr-x - hdfs supergroup 0 2019-03-02 11:29 /test
注意属主和属组
注意：如果需要其他用户对hdfs有写入权限，需要在hdfs-site.xml文件中添加一项属性定义：
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
##上传文件
[hdfs@node4 ~]$ hdfs dfs -put /etc/fstab /test/fstab
[hdfs@node4 ~]$ hdfs dfs -lsr /
lsr: DEPRECATED: Please use 'ls -R' instead.
drwxr-xr-x - hdfs supergroup 0 2019-03-02 11:37 /test
-rw-r--r-- 1 hdfs supergroup 501 2019-03-02 11:37 /test/fstab
/test/fatab这个文件是在远程的hdfs上的
本地文件系统位置：
[root@node4 ~]# vim /fgq/data/hadoop/hdfs/dn/current/BP-1435152656-192.168.25.14-1551494705143/current/finalized/subdir0/subdir0/blk_1073741825
文件过大，分片时，本地文件系统路径也可以查看访问，但是可能会存放于不同目录下
dfs访问接口查看：
[hdfs@node4 ~]$ hdfs dfs -cat /test/fstab
#
# /etc/fstab
# Created by anaconda on Thu Feb 28 17:13:02 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=aebd58c2-fdc1-44ad-b33a-9b6efdf9488c / xfs defaults 0 0
UUID=2fe4fb6b-aab1-42f7-b024-45be2e7065f5 /boot xfs defaults 0 0
UUID=79f97775-e6bb-494d-827a-1f5aa3423c6d swap swap defaults 0 0
[hdfs@node4 ~]$ exit
logout
## 切换至yarn用户，启动yarn服务
[root@node4 hadoop]# su - yarn
[yarn@node4 ~]$ yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /fgq/base-env/hadoop/logs/yarn-yarn-resourcemanager-node4.fgq.com.out
[yarn@node4 ~]$ jps
3376 Jps
3141 ResourceManager
[yarn@node4 ~]$ yarn-daemon.sh start nodemanager
starting nodemanager, logging to /fgq/base-env/hadoop/logs/yarn-yarn-nodemanager-node4.fgq.com.out
[yarn@node4 ~]$ jps
3141 ResourceManager
3525 Jps
3417 NodeManager
Web UI接口浏览
HDFS 和 YARN ResourceManager 各自提供了一个web接口
通过这些接口可以查看HDFS 集群以及YARN集群的相关状态信息
HDFS-NameNode http://192.168.25.14:50070 如下图1
YARN-ResourceManager http://192.168.25.14:8088 如下图2
注意：yarn-site.xml文件中 yarn.resourcemanager.webapp.address 属性的值如果定义为"localhost:8088"，则其WebUI仅监听于127.0.0.1地址上的8088端口。
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Hadoop运行程序
[root@node4 ~]# cd /fgq/base-env/hadoop/share/hadoop/mapreduce/
[root@node4 mapreduce]# ls
Hadoop-YARN自带了许多样例程序，其中的 hadoop-mapreduce-examples-2.9.2.jar 可用作 mapreduce程序，供测试用
注意：要切换用户至hdfs
[root@node4 ~]# su - hdfs
[hdfs@node4 ~]$ yarn jar /fgq/base-env/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.2.jar
需要指定参数--项目名称，如下：
An example program must be given as the first argument.
Valid program names are:
aggregatewordcount: An Aggregate based map/reduce program that counts the words in the input files.
aggregatewordhist: An Aggregate based map/reduce program that computes the histogram of the words in the input files.
bbp: A map/reduce program that uses Bailey-Borwein-Plouffe to compute exact digits of Pi.
dbcount: An example job that count the pageview counts from a database.
distbbp: A map/reduce program that uses a BBP-type formula to compute exact bits of Pi.
grep: A map/reduce program that counts the matches of a regex in the input.
join: A job that effects a join over sorted, equally partitioned datasets
multifilewc: A job that counts words from several files.
pentomino: A map/reduce tile laying program to find solutions to pentomino problems.
pi: A map/reduce program that estimates Pi using a quasi-Monte Carlo method.
randomtextwriter: A map/reduce program that writes 10GB of random textual data per node.
randomwriter: A map/reduce program that writes 10GB of random data per node.
secondarysort: An example defining a secondary sort to the reduce.
sort: A map/reduce program that sorts the data written by the random writer.
sudoku: A sudoku solver.
teragen: Generate data for the terasort
terasort: Run the terasort
teravalidate: Checking results of terasort
wordcount: A map/reduce program that counts the words in the input files.
wordmean: A map/reduce program that counts the average length of the words in the input files.
wordmedian: A map/reduce program that counts the median length of the words in the input files.
wordstandarddeviation: A map/reduce program that counts the standard deviation of the length of the words in the input files.
[hdfs@node4 ~]$ yarn jar /fgq/base-env/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.2.jar wordcount /test/fstab /test/fstab_out
19/03/02 15:49:46 INFO client.RMProxy: Connecting to ResourceManager at node4/192.168.25.14:8032
19/03/02 15:49:47 INFO input.FileInputFormat: Total input files to process : 1
19/03/02 15:49:48 INFO mapreduce.JobSubmitter: number of splits:1
19/03/02 15:49:48 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled
19/03/02 15:49:49 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1551512925744_0001
19/03/02 15:49:49 INFO impl.YarnClientImpl: Submitted application application_1551512925744_0001
19/03/02 15:49:49 INFO mapreduce.Job: The url to track the job: http://node4:8088/proxy/application_1551512925744_0001/
19/03/02 15:49:49 INFO mapreduce.Job: Running job: job_1551512925744_0001
19/03/02 15:49:57 INFO mapreduce.Job: Job job_1551512925744_0001 running in uber mode : false
19/03/02 15:49:57 INFO mapreduce.Job: map 0% reduce 0%
19/03/02 15:50:02 INFO mapreduce.Job: map 100% reduce 0%
19/03/02 15:50:06 INFO mapreduce.Job: map 100% reduce 100%
19/03/02 15:50:07 INFO mapreduce.Job: Job job_1551512925744_0001 completed successfully
19/03/02 15:50:07 INFO mapreduce.Job: Counters: 49
File System Counters
FILE: Number of bytes read=591
FILE: Number of bytes written=397951
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=594
HDFS: Number of bytes written=433
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)=2693
Total time spent by all reduces in occupied slots (ms)=2021
Total time spent by all map tasks (ms)=2693
Total time spent by all reduce tasks (ms)=2021
Total vcore-milliseconds taken by all map tasks=2693
Total vcore-milliseconds taken by all reduce tasks=2021
Total megabyte-milliseconds taken by all map tasks=2757632
Total megabyte-milliseconds taken by all reduce tasks=2069504
Map-Reduce Framework
Map input records=11
Map output records=54
Map output bytes=625
Map output materialized bytes=591
Input split bytes=93
Combine input records=54
Combine output records=38
Reduce input groups=38
Reduce shuffle bytes=591
Reduce input records=38
Reduce output records=38
Spilled Records=76
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=193
CPU time spent (ms)=1250
Physical memory (bytes) snapshot=462479360
Virtual memory (bytes) snapshot=4232617984
Total committed heap usage (bytes)=292028416
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=501
File Output Format Counters
Bytes Written=433
[hdfs@node4 ~]$ hdfs dfs -lsr /test
lsr: DEPRECATED: Please use 'ls -R' instead.
-rw-r--r-- 1 hdfs supergroup 501 2019-03-02 11:37 /test/fstab
drwxr-xr-x - hdfs supergroup 0 2019-03-02 15:50 /test/fstab_out
-rw-r--r-- 1 hdfs supergroup 0 2019-03-02 15:50 /test/fstab_out/_SUCCESS
-rw-r--r-- 1 hdfs supergroup 433 2019-03-02 15:50 /test/fstab_out/part-r-00000
生成一个 /etc/fstab_out 文件目录，目录下生成两个文件 _SUCCESS 和 part-r-00000 ，表示OK
## 查看统计字母的次数
[hdfs@node4 ~]$ hdfs dfs -cat /test/fstab_out/part-r-00000
# 7
'/dev/disk' 1
/ 1
/boot 1
/etc/fstab 1
0 6
17:13:02 1
2019 1
28 1
Accessible 1
Created 1
Feb 1
See 1
Thu 1
UUID=2fe4fb6b-aab1-42f7-b024-45be2e7065f5 1
UUID=79f97775-e6bb-494d-827a-1f5aa3423c6d 1
UUID=aebd58c2-fdc1-44ad-b33a-9b6efdf9488c 1
anaconda 1
and/or 1
are 1
blkid(8) 1
by 2
defaults 3
filesystems, 1
findfs(8), 1
for 1
fstab(5), 1
info 1
maintained 1
man 1
more 1
mount(8) 1
on 1
pages 1
reference, 1
swap 2
under 1
xfs 2
报错
运行jar程序时，报错
[hdfs@node4 ~]$ yarn jar /fgq/base-env/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.2.jar wordcount /test/fstab /test/fstab_out
19/03/02 15:16:11 INFO client.RMProxy: Connecting to ResourceManager at node4/192.168.25.14:8032
19/03/02 15:16:13 INFO ipc.Client: Retrying connect to server: node4/192.168.25.14:8032. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
报错：一直尝试链接，原因是 yarn 服务的 resourcemanager 没有启动
##### 解决
[root@node4 ~]# su - yarn
[yarn@node4 ~]$ jps
5440 Jps
3417 NodeManager
[yarn@node4 ~]$ yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /fgq/base-env/hadoop/logs/yarn-yarn-resourcemanager-node4.fgq.com.out
[yarn@node4 ~]$ jps
5478 ResourceManager
3417 NodeManager
5711 Jps
## 再次启动mapreduce程序，仍然报错
[hdfs@node4 ~]$ yarn jar /fgq/base-env/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.2.jar wordcount /test/fstab /test/fstab_out
19/03/02 15:29:10 INFO client.RMProxy: Connecting to ResourceManager at node4/192.168.25.14:8032
19/03/02 15:29:11 INFO input.FileInputFormat: Total input files to process : 1
19/03/02 15:29:11 INFO mapreduce.JobSubmitter: number of splits:1
19/03/02 15:29:11 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled
19/03/02 15:29:12 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1551511594876_0001
19/03/02 15:29:12 INFO impl.YarnClientImpl: Submitted application application_1551511594876_0001
19/03/02 15:29:12 INFO mapreduce.Job: The url to track the job: http://node4:8088/proxy/application_1551511594876_0001/
19/03/02 15:29:12 INFO mapreduce.Job: Running job: job_1551511594876_0001
19/03/02 15:29:17 INFO mapreduce.Job: Job job_1551511594876_0001 running in uber mode : false
19/03/02 15:29:17 INFO mapreduce.Job: map 0% reduce 0%
19/03/02 15:29:17 INFO mapreduce.Job: Job job_1551511594876_0001 failed with state FAILED due to: Application application_1551511594876_0001 failed 2 times due to AM Container for appattempt_1551511594876_0001_000002 exited with exitCode: 1
Failing this attempt.Diagnostics: [2019-03-02 15:29:17.428]Exception from container-launch.
Container id: container_1551511594876_0001_02_000001
Exit code: 1
[2019-03-02 15:29:17.429]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000ed300000, 35651584, 0) failed; error='Cannot allocate memory' (errno=12)
[2019-03-02 15:29:17.429]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000ed300000, 35651584, 0) failed; error='Cannot allocate memory' (errno=12)
For more detailed output, check the application tracking page: http://node4:8088/cluster/app/application_1551511594876_0001 Then click on links to logs of each attempt.
. Failing the application.
19/03/02 15:29:17 INFO mapreduce.Job: Counters: 0
显示内存不足，关机，增大内存到3G，再开机启动服务
启动
su - hdfs
hdfs namenode -format 第一次需要执行
hadoop-daemon.sh start namenode
hadoop-daemon.sh start secondarynamenode
hadoop-daemon.sh start datanode
jps
1769 NameNode
1945 SecondaryNameNode
2073 DataNode
2155 Jps
hdfs dfs -mkdir /test 第一次需要执行
hdfs dfs -put /etc/fstab /test/fstab 第一次需要执行
hdfs dfs -lsr / 第一次需要执行
su - yarn
yarn-daemon.sh start resourcemanager
yarn-daemon.sh start nodemanager
jps
3141 ResourceManager
3525 Jps
3417 NodeManager
su - hdfs
yarn jar /fgq/base-env/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.2.jar wordcount /test/fstab /test/fstab_out
hdfs dfs -lsr /test
hdfs dfs -cat /test/fstab_out/part-r-00000
