今天中午恰什么

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11.12作业

一、词频统计

1.下载电子书

wget http://www.gutenberg.org/files/1342/1342-0.txt

下载电子书

 

2.编写mapper与reducer函数

mapper.py

 

#!/usr/bin/env python

import sys

for line in sys.stdin:

    line = line.strip()

    words = line.split()

    for word in words:

        print "%s\t%s" % (word, 1)

mapper.py

 

reducer.py

 

#!/usr/bin/env python

from operator import itemgetter

import sys

 

current_word = None

current_count = 0

word = None

 

for line in sys.stdin:

    line = line.strip()

    word, count = line.split('\t', 1)

    try:

        count = int(count)

    except ValueError:

        continue

    if current_word == word:

        current_count += count

    else:

        if current_word:

            print "%s\t%s" % (current_word, current_count)

        current_count = count

        current_word = word

 

if word == current_word:

    print "%s\t%s" % (current_word, current_count)

reduce.py

 

授权

 

ls -l

chmod a+x mapper.py

chmod a+x reducer.py

ls -l

授权

 

3.本地测试mapper与reducer

echo “usr local hadoop user hadoop home hadoop" | ./mapper.py

echo “usr local hadoop user hadoop home hadoop" | ./mapper.py | ./reducer.py

echo “usr local hadoop user hadoop home hadoop" | ./mapper.py | sort -k1,1 | ./reducer.py

本地测试

 

gedit my.txt

编写my.txt

 

cat my.txt | ./mapper.py

cat my.txt | ./mapper.py | ./reducer.py

cat my.txt | ./mapper.py | sort -k1,1 | ./reducer.py

测试my.txt

 

4.将文本数据上传到HDFS上

start-dfs.sh

start.yarn.sh

jps

启动Hadoop

 

hdfs dfs -put *.txt input

hdfs dfs -ls input

hdfs dfs -du input

上传文本

 

查看数据大小

 

5.准备Hadoop streaming

配置~/.bashrc

export STREAM=$HADOOP_HOME /share/hadoop/tools/lib/hadoop-streaming-3.1.3.jar

配置~/.bashrc

 

验证配置是否成功

 

验证成功

 

二、气象数据分析

1.下载气象数据

wget -D --accept-regex=REGEX -P data -r -c ftp://ftp.ncdc.noaa.gov/pub/data/noaa/2020/5*

下载气象数据

 

2.查看下载的气象数据文件

cd data/ftp.ncdc.noaa.gov/pub/data/noaa/2020

ls -l

查看气象数据文件

 

3.解压气象数据文件

zcat data/ftp.ncdc.noaa.gov/pub/data/noaa/2020/5*.gz >qxdata.txt

解压气象数据文件

 

4.上传气象数据文件

hdfs dfs -mkdir qx

hdfs dfs -put data qx

创建qx文件夹

 

上传气象数据文件

 

查看上传结果

 

posted on 2020-11-13 00:02  今天中午恰什么  阅读(152)  评论(0编辑  收藏  举报