Hadoop 流作业在 Python 中失败(不成功)

问题描述

我正在尝试使用 Python 脚本在 Hadoop Streaming 上运行 Map-Reduce 作业，并遇到与 Hadoop Streaming Job failed error in python 但这些解决方案对我不起作用.

I'm trying to run a Map-Reduce job on Hadoop Streaming with Python scripts and getting the same errors as Hadoop Streaming Job failed error in python but those solutions didn't work for me.

当我运行cat sample.txt | ./p1mapper.py | sort | ./p1reducer.py"时，我的脚本运行良好

My scripts work fine when I run "cat sample.txt | ./p1mapper.py | sort | ./p1reducer.py"

但是当我运行以下命令时:

But when I run the following:

./bin/hadoop jar contrib/streaming/hadoop-0.20.2-streaming.jar 
    -input "p1input/*" 
    -output p1output 
    -mapper "python p1mapper.py" 
    -reducer "python p1reducer.py" 
    -file /Users/Tish/Desktop/HW1/p1mapper.py 
    -file /Users/Tish/Desktop/HW1/p1reducer.py

(注意:即使我删除python"或为-mapper和-reducer输入完整路径名，结果也是一样的)

(NB: Even if I remove the "python" or type the full pathname for -mapper and -reducer, the result is the same)

这是我得到的输出:

packageJobJar: [/Users/Tish/Desktop/HW1/p1mapper.py, /Users/Tish/Desktop/CS246/HW1/p1reducer.py, /Users/Tish/Documents/workspace/hadoop-0.20.2/tmp/hadoop-unjar4363616744311424878/] [] /var/folders/Mk/MkDxFxURFZmLg+gkCGdO9U+++TM/-Tmp-/streamjob3714058030803466665.jar tmpDir=null
11/01/18 03:02:52 INFO mapred.FileInputFormat: Total input paths to process : 1
11/01/18 03:02:52 INFO streaming.StreamJob: getLocalDirs(): [tmp/mapred/local]
11/01/18 03:02:52 INFO streaming.StreamJob: Running job: job_201101180237_0005
11/01/18 03:02:52 INFO streaming.StreamJob: To kill this job, run:
11/01/18 03:02:52 INFO streaming.StreamJob: /Users/Tish/Documents/workspace/hadoop-0.20.2/bin/../bin/hadoop job  -Dmapred.job.tracker=localhost:54311 -kill job_201101180237_0005
11/01/18 03:02:52 INFO streaming.StreamJob: Tracking URL: http://www.glassdoor.com:50030/jobdetails.jsp?jobid=job_201101180237_0005
11/01/18 03:02:53 INFO streaming.StreamJob:  map 0%  reduce 0%
11/01/18 03:03:05 INFO streaming.StreamJob:  map 100%  reduce 0%
11/01/18 03:03:44 INFO streaming.StreamJob:  map 50%  reduce 0%
11/01/18 03:03:47 INFO streaming.StreamJob:  map 100%  reduce 100%
11/01/18 03:03:47 INFO streaming.StreamJob: To kill this job, run:
11/01/18 03:03:47 INFO streaming.StreamJob: /Users/Tish/Documents/workspace/hadoop-0.20.2/bin/../bin/hadoop job  -Dmapred.job.tracker=localhost:54311 -kill job_201101180237_0005
11/01/18 03:03:47 INFO streaming.StreamJob: Tracking URL: http://www.glassdoor.com:50030/jobdetails.jsp?jobid=job_201101180237_0005
11/01/18 03:03:47 ERROR streaming.StreamJob: Job not Successful!
11/01/18 03:03:47 INFO streaming.StreamJob: killJob...
Streaming Job Failed!

对于每个失败/终止的任务尝试:

For each Failed/Killed Task Attempt:

Map output lost, rescheduling: getMapOutput(attempt_201101181225_0001_m_000000_0,0) failed :
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_201101181225_0001/attempt_201101181225_0001_m_000000_0/output/file.out.index in any of the configured local directories
    at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:389)
    at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathToRead(LocalDirAllocator.java:138)
    at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:2887)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
    at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)

这是我的 Python 脚本:p1mapper.py

Here are my Python scripts: p1mapper.py

#!/usr/bin/env python

import sys
import re

SEQ_LEN = 4

eos = re.compile('(?<=[a-zA-Z]).')   # period preceded by an alphabet
ignore = re.compile('[Wd]')

for line in sys.stdin:
    array = re.split(eos, line)
    for sent in array:
        sent = ignore.sub('', sent)
        sent = sent.lower()
        if len(sent) >= SEQ_LEN:
            for i in range(len(sent)-SEQ_LEN + 1):
                print '%s 1' % sent[i:i+SEQ_LEN]

p1reducer.py

p1reducer.py

#!/usr/bin/env python

from operator import itemgetter
import sys

word2count = {}

for line in sys.stdin:
    word, count = line.split(' ', 1)
    try:
        count = int(count)
        word2count[word] = word2count.get(word, 0) + count
    except ValueError:    # count was not a number
        pass

# sort
sorted_word2count = sorted(word2count.items(), key=itemgetter(1), reverse=True)

# write the top 3 sequences
for word, count in sorted_word2count[0:3]:
    print '%s	%s'% (word, count)

非常感谢任何帮助，谢谢！

Would really appreciate any help, thanks!

更新:

hdfs-site.xml:

hdfs-site.xml:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

<property>

          <name>dfs.replication</name>

          <value>1</value>

</property>

</configuration>

mapred-site.xml:

mapred-site.xml:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

<property>

          <name>mapred.job.tracker</name>

          <value>localhost:54311</value>

</property>

</configuration>

推荐答案

你缺少很多配置，你需要定义目录等.见这里:

You are missing a lot of configurations and you need to define directories and such. See here:

http://wiki.apache.org/hadoop/QuickStart

分布式操作和上面描述的伪分布式操作一样，除了:

Distributed operation is just like the pseudo-distributed operation described above, except:

1. 在 conf/hadoop-site.xml 的 fs.default.name 和 mapred.job.tracker 的值中指定主服务器的主机名或 IP 地址.这些被指定为主机:端口对.
2. 在 conf/hadoop-site.xml 中指定 dfs.name.dir 和 dfs.data.dir 的目录.它们分别用于保存主节点和从节点上的分布式文件系统数据.请注意，dfs.data.dir 可能包含以空格或逗号分隔的目录名称列表，以便数据可以存储在多个设备上.
3. 在 conf/hadoop-site.xml 中指定 mapred.local.dir.这决定了临时 MapReduce 数据的写入位置.它也可以是目录列表.
4. 在 conf/mapred-default.xml 中指定 mapred.map.tasks 和 mapred.reduce.tasks.根据经验，mapred.map.tasks 使用 10 倍的从处理器数量，mapred.reduce.tasks 使用 2 倍的从处理器数量.
5. 在您的 conf/slaves 文件中列出所有从属主机名或 IP 地址，每行一个，并确保 jobtracker 在您的/etc/hosts 文件中指向您的 jobtracker 节点

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