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继续运行hadoop分布式模式失败

本文介绍了继续运行hadoop分布式模式失败的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

很长时间以来我一直在困扰这个问题。
我尝试在distibuted节点中运行某些东西。
我有2个datanode和masternode和jobtracker。
我在每个节点的tasktracker.log中都收到以下错误： 

 < 
 2012-01-03 08：48：30,910 WARN mortbay.log  -  / mapOutput：org.apache.hadoop.util.DiskChecker $ DiskErrorException：找不到taskTracker / jobcache / job_201201031846_0001 / attempt_201201031846_0001_m_000000_1 / output / file.out .index在任何配置的本地目录中
 2012-01-03 08:48:40,927警告mapred.TaskTracker  -  getMapOutput（attempt_201201031846_0001_m_000000_2,0）失败：
 org.apache.hadoop.util.DiskChecker $ DiskErrorException：无法在任何配置的本地目录中找到taskTracker / jobcache / job_201201031846_0001 / attempt_201201031846_0001 / attempt_201201031846_0001_m_000000_2 / output / file.out.index 
 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） 
位于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（HttpConnect 
 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）
>

以及奴隶的hadoop.log中的这个错误： 

  2012-01-03 10：20：36,732警告mapred.ReduceTask  -  attempt_201201031954_0006_r_000001_0将主机localhost添加到惩罚框中，下一次联系在4秒内
 2012-01- 03 10：20：41,738警告mapred.ReduceTask  -  attempt_201201031954_0006_r_000001_0复制失败：attempt_201201031954_0006_m_000001_2 from localhost 
 2012-01-03 10：20：41,738警告mapred.ReduceTask  -  java.io.FileNotFoundException：http：// localhost：50060 / mapOutput？job = job_201201031954_0006& map = attempt_201201031954_0006_m_000001_2& reduce = 1 
 at sun.reflect.GeneratedConstructorAccessor6.newInstance（Unknown Source）
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27）
 at java.lang.reflect.Constructor.newInstance（Constructor.java:513）
 at sun.net.www.protocol.http.HttpURLConnection $ 6.run（HttpURLConnection.java:1491）
在java.securi ty.AccessController.doPrivileged（本地方法）
在sun.net.www.protocol.http.HttpURLConnection.getChainedException（HttpURLConnection.java:1485）
在sun.net.www.protocol.http.HttpURLConnection .getInputStream（HttpURLConnection.java:1139）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.getInputStream（ReduceTask.java:1447）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.getMapOutput（ReduceTask.java:1349）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.copyOutput（ReduceTask.java:1261）
 at org.apache.hadoop .mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.run（ReduceTask.java:1195）
导致：java.io.FileNotFoundException：http：// localhost：50060 / mapOutput？job = job_201201031954_0006& map = attempt_201201031954_0006_m_000001_2& reduce = 1 
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream（HttpURLConnection.java:1434）
 ... 4 more 
 
 2012-01-03 10 ：20：41,739 WARR mapred.ReduceTask  -  attempt_201201031954_0006_r_000001_0将主机本地主机添加到惩罚框中，在4秒内接触下一个
 2012-01-03 10：20：46,761警告mapred.ReduceTask  -  attempt_201201031954_0006_r_000001_0复制失败：attempt_201201031954_0006_m_000000_3 from localhost 
 2012-01-03 10：20：46,762警告mapred.ReduceTask  -  java.io.FileNotFoundException：http：// localhost：50060 / mapOutput？job = job_201201031954_0006& map = attempt_201201031954_0006_m_000000_3& reduce = 1 
 at sun .reflect.GeneratedConstructorAccessor6.newInstance（Unknown Source）
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27）
 at java.lang.reflect.Constructor.newInstance（Constructor.java:513） 
 at sun.net.www.protocol.http.HttpURLConnection $ 6.run（HttpURLConnection.java:1491）
 at java.security.AccessController.doPrivileged（Native Method）
 at sun.net .www.protocol.http.HttpURLConnection.getChainedExc eption（HttpURLConnection.java:1485）
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream（HttpURLConnection.java:1139）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.getInputStream（ReduceTask.java:1447）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.getMapOutput（ReduceTask.java:1349）
 at org.apache.hadoop.mapred。 ReduceTask $ ReduceCopier $ MapOutputCopier.copyOutput（ReduceTask.java:1261）
 at org.apache.hadoop.mapred.ReduceTask $ ReduceCopier $ MapOutputCopier.run（ReduceTask.java:1195）
引起：java。 io.FileNotFoundException：http：// localhost：50060 / mapOutput？job = job_201201031954_0006& map = attempt_201201031954_0006_m_000000_3& reduce = 1 
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream（HttpURLConnection.java:1434） 
 ... 4 more

这是我的配置：



mapred-site： 

 <属性> 
<名称> mapred.job.tracker< / name> 
< value> 10.20.1.112：9001< / value> 
< description> MapReduce作业跟踪器运行
 at的主机和端口。< / description> 
< / property> 
 
<属性> 
<名称> mapred.map.tasks< / name> 
<值> 2< /值> 
< description> 
将mapred.map任务定义为从属主机的数量
< / description> 
< / property> 
 
<属性> 
<名称> mapred.reduce.tasks< / name> 
<值> 2< /值> 
< description> 
将mapred.reduce任务定义为从属主机数量
 < / property> 
 
<属性> 
<名称> mapred.system.dir< /名称> 
<值> filesystem / mapreduce / system< / value> 
< / property> 
 
<属性> 
<名称> mapred.local.dir< / name> 
<值> filesystem / mapreduce / local< / value> 
< / property> 
 
<属性> 
<名称> mapred.submit.replication< / name> 
<值> 2< /值> 
< / property> 
<属性> 
< name> hadoop.tmp.dir< / name> 
<值> tmp< /值> 
< / property> 
 
<属性> 
<名称> mapred.child.java.opts< / name> 
<值> -Xmx2048m< /值> 
< / property>

核心站点： 

 <性> 
<名称> fs.default.name< /名称> 
<值> hdfs：//10.20.1.112：9000< /值> 
< description>默认文件系统的名称。一个URI，其
模式和权限决定了FileSystem的实现。 
< / description> 
< / property>

我试过玩tmp dir - 没有帮助。
我尝试过使用mapred.local.dir - 没有帮助。



我也厌倦了在运行时查看文件系统目录中的内容。
我发现路径：taskTracker / jobcache / job_201201031846_0001 / attempt_201201031846_0001_m_000000_1 /
存在，但它没有输出文件夹。



任何想法？



谢谢。

解决方案

在这里，我想问题是：您的tasktracker想要询问master的映射输出，所以它应该是： p> 

  http://10.20.1.112:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000001_2&reduce=1

但是在你的tasknode中，它试图从 

  http：// localhost：50060 / mapOutput？job = job_201201031954_0006& map = attempt_201201031954_0006_m_000001_2& reduce = 1

所以问题发生了，主要问题不是hadoop.tmp.dir，mapred.system.dir和mapred.local.dir，我也面临这个问题，我解决了通过删除master / etc / hosts中的127.0.0.1 localhost问题，也许你可以试试它！

编辑



总之，请转到导致错误的节点文件结构中的 etc / hosts 文件，并删除l ine 127.0.0.1 localhost


I'm stuck on this problem for a very long time.I try to run something in distibuted node.I have 2 datanodes and a master with namenode and jobtracker.I keep getting the following error in tasktracker.log of each of the nodes

<
2012-01-03 08:48:30,910 WARN  mortbay.log - /mapOutput: org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_201201031846_0001/attempt_201201031846_0001_m_000000_1/output/file.out.index in any of the configured local directories
2012-01-03 08:48:40,927 WARN  mapred.TaskTracker - getMapOutput(attempt_201201031846_0001_m_000000_2,0) failed :
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_201201031846_0001/attempt_201201031846_0001_m_000000_2/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)
>

and this error in hadoop.log of the slave:

2012-01-03 10:20:36,732 WARN  mapred.ReduceTask - attempt_201201031954_0006_r_000001_0 adding host localhost to penalty box, next contact in 4 seconds
2012-01-03 10:20:41,738 WARN  mapred.ReduceTask - attempt_201201031954_0006_r_000001_0 copy failed: attempt_201201031954_0006_m_000001_2 from localhost
2012-01-03 10:20:41,738 WARN  mapred.ReduceTask - java.io.FileNotFoundException: http://localhost:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000001_2&reduce=1
    at sun.reflect.GeneratedConstructorAccessor6.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getInputStream(ReduceTask.java:1447)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1349)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1261)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1195)
Caused by: java.io.FileNotFoundException: http://localhost:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000001_2&reduce=1
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)
    ... 4 more

2012-01-03 10:20:41,739 WARN  mapred.ReduceTask - attempt_201201031954_0006_r_000001_0 adding host localhost to penalty box, next contact in 4 seconds
2012-01-03 10:20:46,761 WARN  mapred.ReduceTask - attempt_201201031954_0006_r_000001_0 copy failed: attempt_201201031954_0006_m_000000_3 from localhost
2012-01-03 10:20:46,762 WARN  mapred.ReduceTask - java.io.FileNotFoundException: http://localhost:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000000_3&reduce=1
    at sun.reflect.GeneratedConstructorAccessor6.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getInputStream(ReduceTask.java:1447)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1349)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1261)
    at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1195)
Caused by: java.io.FileNotFoundException: http://localhost:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000000_3&reduce=1
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)
    ... 4 more

This is my configuration:

mapred-site:

    <property>
<name>mapred.job.tracker</name>
<value>10.20.1.112:9001</value>
<description>The host and port that the MapReduce job tracker runs
at.</description>
</property>

<property>
  <name>mapred.map.tasks</name>
  <value>2</value>
  <description>
    define mapred.map tasks to be number of slave hosts
  </description>
</property>

<property>
  <name>mapred.reduce.tasks</name>
  <value>2</value>
  <description>
    define mapred.reduce tasks to be number of slave hosts
  </description>
</property>

<property>
  <name>mapred.system.dir</name>
  <value>filesystem/mapreduce/system</value>
</property>

<property>
  <name>mapred.local.dir</name>
  <value>filesystem/mapreduce/local</value>
</property>

<property>
  <name>mapred.submit.replication</name>
  <value>2</value>
</property>
<property>
    <name>hadoop.tmp.dir</name>
    <value>tmp</value>
</property>

<property>
    <name>mapred.child.java.opts</name>
    <value>-Xmx2048m</value>
</property>

core-site:

<property>
<name>fs.default.name</name>
<value>hdfs://10.20.1.112:9000</value>
<description>The name of the default file system. A URI whose
scheme and authority determine the FileSystem implementation.
</description>
</property>

I've tried playing with tmp dir - didnt help.I've tried playing with mapred.local.dir - didn't help.

I also tired to see what is in the filesystem dir during runtime.I found that the path : taskTracker/jobcache/job_201201031846_0001/attempt_201201031846_0001_m_000000_1/exists, but it doesn't have output folder in it.

any idea?

thanks.

解决方案

Here I think the question is: Your tasktracker wants to ask the map output from master, so it should be:

http://10.20.1.112:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000001_2&reduce=1

but in your tasknode, it tried to get it from 

http://localhost:50060/mapOutput?job=job_201201031954_0006&map=attempt_201201031954_0006_m_000001_2&reduce=1

so the problem occurs, and the main problem is not hadoop.tmp.dir, mapred.system.dir and mapred.local.dir, I'm facing this problem too, and I resolved the problem by deleting the "127.0.0.1 localhost" in /etc/hosts of master, maybe you can try it!

EDIT

In summary, go to the etc/hosts file in the file structure of the node that's causing the error and remove the line 127.0.0.1 localhost

这篇关于继续运行hadoop分布式模式失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

06-27 01:32
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