top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Questions about usage of Hadoop built-in examples

+1 vote
522 views

I am used to old version where I could use the typical hadoop-examples-*.jar with wordcount, sort or any other.

Recently I am using the latest version (2.7.1) but as can I see, there is no this dot jar file with examples. After a search over the Internet, I saw that there is a hadoop-mapreduce-examples jar file. Where I can find usage help for this examples? Available examples, etc.

I am focused on the HiBench tool (which use those examples) that Im using to test some modifications on the source code of Hadoop.

posted Sep 14, 2015 by anonymous

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

In 2.7.1 I am able to see /share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.1.jar which can help you run some sample MapRed Examples like wordcount/ PI

/opt/install/hadoop-2.7.1/bin$ ./yarn jar ../share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.1.jar
Listening for transport dt_socket at address: 7003 An example program must be given as the first argument.Valid program names are:
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.
bbp: A map/reduce program that uses Bailey-Borwein-Plouffe to compute exact digits of Pi.
dbcount: An example job that count the pageview counts from a database.
distbbp: A map/reduce program that uses a BBP-type formula to compute exact bits of Pi....

answer Sep 14, 2015 by Sonu Jindal
Similar Questions
+1 vote
Issue about datanode memory usage with Hadoop?

I have a job running very slowly, when I examine cluster, I find my hdfs user using 170m swap though top command, thats user run datanode daemon, ps output show following info, there are two -Xmx value, and i do not know which value is the real ,1000m or 10240m 

# ps -ef|grep 2853
root      2095  1937  0 15:06 pts/4    00:00:00 grep 2853
hdfs      2853     1  5 Nov07 ?        1-22:34:22 /usr/java/jdk1.7.0_45/bin/java -Dproc_datanode -Xmx1000m -Dhadoop.log.dir=/var/log/hadoop-hdfs -Dhadoop.log.file=hadoop-hdfs-datanode-ch14.log -Dhadoop.home.dir=/usr/lib/hadoop -Dhadoop.id.str=hdfs -Dhadoop.root.logger=INFO,RFA -Djava.library.path=/usr/lib/hadoop/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -server -Xmx10240m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:/var/log/hadoop-hdfs/gc-ch14-datanode.log -Dhadoop.security.logger=INFO,RFAS org.apache.hadoop.hdfs.server.datanode.DataNode
+1 vote
Issue about enable UseNUMA flag in hadoop framework

We get a problem about enable UseNUMA flag for my hadoop framework.

We've tried to specify JVM flags during hadoop daemon's starts, 

e.g. export HADOOP_NAMENODE_OPTS="-XX:UseNUMA -Dcom.sun.management.jmxremote $HADOOP_NAMENODE_OPTS",  
export HADOOP_SECONDARYNAMENODE_OPTS="-XX:UseNUMA -Dcom.sun.management.jmxremote $HADOOP_SECONDARYNAMENODE_OPTS", etc.

But the ratio between local and remote memory access is 2:1, just remains as same as before.

Then we find that hadoop MapReduce start child JVM processes to run task in containers. So we passes -XX:UseNUMA to JVMs by set theting configuration parameter child.java.opts. But hadoop starts to throw ExitCodeExceptionException (exitCode=1), seems that hadoop does not support this JVM parameter.

What should we do to enable UseNUMA flag for my hadoop? Or what should we do to decrease the local/remote memory access in NUMA framework? Should we just change Hadoop script or resorts to source code? And how to do it?

The hadoop version is 2.6.0.

+2 votes
Issue about running hive MR job in hadoop

I submit a MR job through hive ,but when it run stage-2 , it failed but why? It seems permission problem , but I do not know which dir cause the problem 

Application application_1388730279827_0035 failed 1 times due to AM Container for appattempt_1388730279827_0035_000001 exited with exitCode: -1000 due to: EPERM: 
Operation not permitted at org.apache.hadoop.io.nativeio.NativeIO.chmod(Native Method) at 
org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:581) at 
org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:388) at 
org.apache.hadoop.fs.FileSystem.primitiveMkdir(FileSystem.java:1041) at 
org.apache.hadoop.fs.DelegateToFileSystem.mkdir(DelegateToFileSystem.java:150) at 
org.apache.hadoop.fs.FilterFs.mkdir(FilterFs.java:190) at 
org.apache.hadoop.fs.FileContext$4.next(FileContext.java:698) at 
org.apache.hadoop.fs.FileContext$4.next(FileContext.java:695) at 
org.apache.hadoop.fs.FileContext$FSLinkResolver.resolve(FileContext.java:2325) at 
org.apache.hadoop.fs.FileContext.mkdir(FileContext.java:695) at 
org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.initDirs(ContainerLocalizer.java:385) at 
org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.runLocalization(ContainerLocalizer.java:130) at 
org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.startLocalizer(DefaultContainerExecutor.java:103) at 
org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerRunner.run(ResourceLocalizationService.java:861) .
Failing this attempt.. 
Failing the application.
...