blocks|key|5403928|text|您要查找的Jar文件位于以下目录中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5403929|hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar|code-block|syntax|javascript|5403930|并且应该使用下面这样的命令运行：|5403931|$+yarn+jar+hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar+wordcount+/input+/output|5403932|entityMap^0|5|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

The <code>Jar</code> file you are looking for is in this directory:

<pre><code>hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar
</code></pre>

and should be run with a command like this:

<pre><code>$ yarn jar hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /input /output
</code></pre>

blocks|key|2261364|text|Hadoop示例jar在这里不再存在。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2261365|usr/local/hadoop/bin/hadoop|code-block|syntax|javascript|2261366|在hadoop+version2.x中，正如SAM在他的回答中正确指出的那样，您要查找的jar是|2261367|$HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar|2261368|你可以像这样运行它，|2261369|hadoop+jar+$HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar+wordcount+/input+/output|2261370|确保/input文件夹中有一个输入文件要在hdfs中计数。还要注意，/output不应该存在。这是由hadoop框架创建的。|offset|length|style|CODE|2261371|另外，请参考本文档来使用Hadoop2.2.0+Shell命令。最好不要使用不推荐使用的版本。|2261372|http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-common/FileSystemShell.html|2261373|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|2|6|Y|7|0|0|0|2J|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|17|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|19|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1B|8|@$Q|1C|R|1D|S|T]|$Q|1E|R|1F|S|T]]|9|@]|A|$]]|$1|U|3|V|5|6|7|1G|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1H|8|@]|9|@$Q|1I|R|1J|1|1K]]|A|$]]|$1|Y|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|X]]]]

Hadoop example jar is no more present here.

<pre><code>usr/local/hadoop/bin/hadoop
</code></pre>

From hadoop version 2.x, as SAM has rightly indicated in his answer, the jar you are looking for is

<pre><code>$HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar
</code></pre>

You can run it like,

<pre><code>hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /input /output
</code></pre>

Make sure <code>/input</code> folder has an input file to be counted in the hdfs. Also note that <code>/output</code> should not exist. This is for the hadoop framework to create.

Also please refer to this document to use the Hadoop2.2.0 Shell Commands. It is always a good practice to not use the deprecated version.

<a href="http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-common/FileSystemShell.html" rel="nofollow">http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-common/FileSystemShell.html</a>

blocks|key|2266778|text|在我的hadoop中，我在2.4.1中工作，所以命令是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2266779|hadoop+jar+$HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.4.1.jar+wordcount+/input+/output|2266780|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In my hadoop, I am working in 2.4.1 so the command is

hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.4.1.jar wordcount /input /output

blocks|key|5403904|text|您必须编译WordCount.java，然后按如下所示对其进行JAR。我不得不到处寻找lib路径，但最终我能够使用它来编译examples类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5403905|[apesa@localhost+~]$+javac+-classpath+$HADOOP_HOME/apesa/hadoop/common/hadoop-common-2.2.0.jar:$HADOOP_HOME/apesa/hadoop/mapreduce/hadoop-mapreduce-client-core-2.2.0.jar:$HADOOP_HOME/apesa/hadoop/common/lib/commons-cli-1.2.jar+-d+wordcount_classes+WordCount.java|code-block|syntax|javascript|5403906|然后按如下所示进行JAR|5403907|[apesa@localhost+~]$+jar+-cvf+wordcount.jar+-C+wordcount_classes/+.+|5403908|我已经有一段时间没有运行这个程序了，但是如果出现错误，您可能需要验证lib文件是否在相同的位置|5403909|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You have to compile the WordCount.java and then JAR it as follows below. I had to dig around for the lib paths, but in the end I was able to use this to compile the examples Class

<pre><code>[apesa@localhost ~]$ javac -classpath $HADOOP_HOME/apesa/hadoop/common/hadoop-common-2.2.0.jar:$HADOOP_HOME/apesa/hadoop/mapreduce/hadoop-mapreduce-client-core-2.2.0.jar:$HADOOP_HOME/apesa/hadoop/common/lib/commons-cli-1.2.jar -d wordcount_classes WordCount.java
</code></pre>

Then JAR it as follows

<pre><code>[apesa@localhost ~]$ jar -cvf wordcount.jar -C wordcount_classes/ . 
</code></pre>

I have not run this in a while but you may have to verify the lib files are in the same place if you get an error

I installed hadoop 2.2.0 and try to run sample wordcount program. For that, first I imported data in to hdfs using:

<pre><code>bin/hadoop fs -copyFromLocal /home/prassanna/Desktop/input /input
</code></pre>

After that, I tried to run word count jar file using:

<pre><code>root@prassanna-Studio-1558:/usr/local/hadoop# bin/hadoop jar hadoop*examples*.jar wordcount /input -output
</code></pre>

but it showed: <code>Not a valid JAR: /usr/local/hadoop/hadoop*examples*.jar</code>

I checked in <code>usr/local/hadoop/bin/hadoop</code> directory and there is no hadoop example jar.

hadoop/bin/hadoop doesn't have the example jar

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我安装了hadoop 2.2.0，并尝试运行示例字数统计程序。为此，首先我使用以下命令将数据导入到hdfs：bin/hadoop fs -copyFromLocal /home/prassanna/Desktop/input /input之后，我尝试使用以下命令运行word count jar文件：root@prassanna-Studio-1558:/usr/local/hadoop# bin/

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