Changes between Version 3 and Version 4 of 0428Hadoop_Lab5

Timestamp:

Apr 26, 2009, 12:56:47 AM (15 years ago)

Author:

waue

Comment:

--

0428Hadoop_Lab5

@@ +1 @@
+{{{
+#!html
+<div style="text-align: center;"><big
+ style="font-weight: bold;"><big><big>實做五、執行 MapReduce 基本運算</big></big></big></div>
+}}}
+[[PageOutline]]
+
+ == 1 Hadoop運算命令 grep ==  
+ 
+ * grep 這個命令是擷取文件裡面特定的字元，在Hadoop example中此指令可以擷取文件中有此指定文字的字串，並作計數統計
+ 
+{{{
+ /opt/hadoop$ bin/hadoop jar hadoop-*-examples.jar grep input grep_output 'dfs[a-z.]+' 
+ 
+}}}
+ 
+ 運作的畫面如下：
+ 
+{{{
+
+09/03/24 12:33:45 INFO mapred.FileInputFormat: Total input paths to process : 9
+09/03/24 12:33:45 INFO mapred.FileInputFormat: Total input paths to process : 9
+09/03/24 12:33:45 INFO mapred.JobClient: Running job: job_200903232025_0003
+09/03/24 12:33:46 INFO mapred.JobClient:  map 0% reduce 0%
+09/03/24 12:33:47 INFO mapred.JobClient:  map 10% reduce 0%
+09/03/24 12:33:49 INFO mapred.JobClient:  map 20% reduce 0%
+09/03/24 12:33:51 INFO mapred.JobClient:  map 30% reduce 0%
+09/03/24 12:33:52 INFO mapred.JobClient:  map 40% reduce 0%
+09/03/24 12:33:54 INFO mapred.JobClient:  map 50% reduce 0%
+09/03/24 12:33:55 INFO mapred.JobClient:  map 60% reduce 0%
+09/03/24 12:33:57 INFO mapred.JobClient:  map 70% reduce 0%
+09/03/24 12:33:59 INFO mapred.JobClient:  map 80% reduce 0%
+09/03/24 12:34:00 INFO mapred.JobClient:  map 90% reduce 0%
+09/03/24 12:34:02 INFO mapred.JobClient:  map 100% reduce 0%
+09/03/24 12:34:10 INFO mapred.JobClient:  map 100% reduce 10%
+09/03/24 12:34:12 INFO mapred.JobClient:  map 100% reduce 13%
+09/03/24 12:34:15 INFO mapred.JobClient:  map 100% reduce 20%
+09/03/24 12:34:20 INFO mapred.JobClient:  map 100% reduce 23%
+09/03/24 12:34:22 INFO mapred.JobClient: Job complete: job_200903232025_0003
+09/03/24 12:34:22 INFO mapred.JobClient: Counters: 16
+09/03/24 12:34:22 INFO mapred.JobClient:   File Systems
+09/03/24 12:34:22 INFO mapred.JobClient:     HDFS bytes read=48245
+09/03/24 12:34:22 INFO mapred.JobClient:     HDFS bytes written=1907
+09/03/24 12:34:22 INFO mapred.JobClient:     Local bytes read=1549
+09/03/24 12:34:22 INFO mapred.JobClient:     Local bytes written=3584
+09/03/24 12:34:22 INFO mapred.JobClient:   Job Counters 
+......
+}}}
+
+ 
+ * 接著查看結果
+
+{{{
+  /opt/hadoop$ bin/hadoop fs -ls grep_output
+  /opt/hadoop$ bin/hadoop fs -cat grep_output/part-00000 
+}}}
+
+ 結果如下
+
+{{{
+3       dfs.class
+3       dfs.
+2       dfs.period
+1       dfs.http.address
+1       dfs.balance.bandwidth
+1       dfs.block.size
+1       dfs.blockreport.initial
+1       dfs.blockreport.interval
+1       dfs.client.block.write.retries
+1       dfs.client.buffer.dir
+1       dfs.data.dir
+1       dfs.datanode.address
+1       dfs.datanode.dns.interface
+1       dfs.datanode.dns.nameserver
+1       dfs.datanode.du.pct
+1       dfs.datanode.du.reserved
+1       dfs.datanode.handler.count
+1       dfs.datanode.http.address
+1       dfs.datanode.https.address
+1       dfs.datanode.ipc.address
+1       dfs.default.chunk.view.size
+1       dfs.df.interval
+1       dfs.file
+1       dfs.heartbeat.interval
+1       dfs.hosts
+1       dfs.hosts.exclude
+1       dfs.https.address
+1       dfs.impl
+1       dfs.max.objects
+1       dfs.name.dir
+1       dfs.namenode.decommission.interval
+1       dfs.namenode.decommission.interval.
+1       dfs.namenode.decommission.nodes.per.interval
+1       dfs.namenode.handler.count
+1       dfs.namenode.logging.level
+1       dfs.permissions
+1       dfs.permissions.supergroup
+1       dfs.replication
+1       dfs.replication.consider
+1       dfs.replication.interval
+1       dfs.replication.max
+1       dfs.replication.min
+1       dfs.replication.min.
+1       dfs.safemode.extension
+1       dfs.safemode.threshold.pct
+1       dfs.secondary.http.address
+1       dfs.servers
+1       dfs.web.ugi
+1       dfsmetrics.log
+
+ }}}
+
+ ==2 Hadoop運算命令 WordCount ==
+ 
+ * 如名稱，WordCount會對所有的字作字數統計，並且從a-z作排列
+ 
+ {{{
+ /opt/hadoop$ bin/hadoop jar hadoop-*-examples.jar wordcount input wc_output
+ }}}
+ 
+ 檢查輸出結果的方法同2.1的方法
+
+ === 2.3 更多運算命令 ===
+ 
+ 可執行的指令一覽表：
+
+ || 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. || 
+ || 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 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. || 
+ || sleep ||  A job that sleeps at each map and reduce task. || 
+ || sort || A map/reduce program that sorts the data written by the random writer. || 
+ || sudoku ||  A sudoku solver. || 
+ || wordcount || A map/reduce program that counts the words in the input files. || 
+
+ 請參考 [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/package-summary.html org.apache.hadoop.examples]
+
+{{{
+#!html
+<html lang="zh-tw"><head>
+
+<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type"><title>a.html</title>
+
+</head><body>
+<br>
+
+<p>
+</p><table summary="" border="1" cellpadding="3" cellspacing="0" width="100%">
+<tbody><tr class="TableHeadingColor" bgcolor="#ccccff">
+<th colspan="2" align="left"><font size="+2">
+<b>Class Summary</b></font></th>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/AggregateWordCount.html" title="class in org.apache.hadoop.examples">AggregateWordCount</a></b></td>
+<td>This is an example Aggregated Hadoop Map/Reduce application. It
+reads the text input files, breaks each line into words and counts
+them. The output is a locally sorted list of words and the count of how
+often they occurred. To run: bin/hadoop jar hadoop-*-examples.jar
+aggregatewordcount in-dir out-dir numOfReducers textinputformat </td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/AggregateWordHistogram.html" title="class in org.apache.hadoop.examples">AggregateWordHistogram</a></b></td>
+<td>This is an example Aggregated Hadoop Map/Reduce application.
+Computes the histogram of the words in the input texts. To run:
+bin/hadoop jar hadoop-*-examples.jar aggregatewordhist in-dir out-dir
+numOfReducers textinputformat </td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/ExampleDriver.html" title="class in org.apache.hadoop.examples">ExampleDriver</a></b></td>
+<td>A description of an example program based on its class and a human-readable description.</td>
+</tr>
+
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/Grep.html" title="class in org.apache.hadoop.examples">Grep</a></b></td>
+<td>&nbsp;</td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/Join.html" title="class in org.apache.hadoop.examples">Join</a></b></td>
+<td>This is the trivial map/reduce program that does absolutely nothing
+other than use the framework to fragment and sort the input values. To
+run: bin/hadoop jar build/hadoop-examples.jar join [-m maps] [-r
+reduces] [-inFormat input format class] [-outFormat output format
+class] [-outKey output key class] [-outValue output value class]
+[-joinOp] [in-dir]* in-dir out-dir</inner></td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/RandomTextWriter.html" title="class in org.apache.hadoop.examples">RandomTextWriter</a></b></td>
+<td>This program uses map/reduce to just run a distributed job where
+there is
+no interaction between the tasks and each task writes a large unsorted
+random sequence of words.To run: bin/hadoop jar
+hadoop-${version}-examples.jar randomtextwriter [-outFormat output
+format class] output</td>
+
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/RandomWriter.html" title="class in org.apache.hadoop.examples">RandomWriter</a></b></td>
+<td>This program uses map/reduce to just run a distributed job where
+there is
+no interaction between the tasks and each task write a large unsorted
+random binary sequence file of BytesWritable.To run: bin/hadoop jar
+hadoop-${version}-examples.jar randomwriter [-outFormat output format
+class] output</td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/Sort.html" title="class in org.apache.hadoop.examples">Sort&lt;K,V&gt;</a></b></td>
+<td>This is the trivial map/reduce program that does absolutely nothing
+other than use the framework to fragment and sort the input values.To
+run: bin/hadoop jar build/hadoop-examples.jar sort [-m maps] [-r
+reduces] [-inFormat input format class] [-outFormat output format
+class] [-outKey output key class] [-outValue output value class]
+[-totalOrder pcnt num samples max splits] in-dir out-dir</td>
+</tr>
+<tr class="TableRowColor" bgcolor="white">
+<td width="15%"><b><a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/WordCount.html" title="class in org.apache.hadoop.examples">WordCount</a></b></td>
+
+<td>This is an example Hadoop Map/Reduce application.</td>
+</tr>
+</tbody></table>
+</body></html>
+}}} 
+ 
+
+ == 3. 使用網頁Gui瀏覽資訊 ==
+ 
+ * [http://localhost:50030 Map/Reduce Administration]
+ * [http://localhost:50070 NameNode ]