hadoop-mapreduce-examples | complex examples of mapreduce tasks

by ZuInnoTe Java Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | hadoop-mapreduce-examples Summary

hadoop-mapreduce-examples is a Java library typically used in Big Data, Spark, Hadoop applications. hadoop-mapreduce-examples has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub.

Some simple and complex examples of mapreduce tasks for Hadoop. The main idea is to use a build tool (Gradle) and to show how standard map/reduce tasks can be executed on Hadoop2. You should have Hadoop installed locally, run it on a cluster or leverage a cloud service, such as Amazon EMR, Google Compute or Microsoft Azure.

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hadoop-mapreduce-examples has a low active ecosystem.

It has 6 star(s) with 5 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

hadoop-mapreduce-examples has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of hadoop-mapreduce-examples is current.

Quality

hadoop-mapreduce-examples has 0 bugs and 12 code smells.

Security

hadoop-mapreduce-examples has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

hadoop-mapreduce-examples code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

hadoop-mapreduce-examples is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

hadoop-mapreduce-examples releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

hadoop-mapreduce-examples saves you 43 person hours of effort in developing the same functionality from scratch.

It has 115 lines of code, 6 functions and 6 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed hadoop-mapreduce-examples and discovered the below as its top functions. This is intended to give you an instant insight into hadoop-mapreduce-examples implemented functionality, and help decide if they suit your requirements.

Main command line
Main entry point for testing
Writes a word to the output collector
Maps the given value to the output collector
Computes the sum of the values

Get all kandi verified functions for this library.

hadoop-mapreduce-examples Key Features

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hadoop-mapreduce-examples Examples and Code Snippets

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Community Discussions

Trending Discussions on hadoop-mapreduce-examples

Copy a file from local machine to docker container

Apache Oozie throws ClassNotFoundException (org.apache.hadoop.conf.Configuration) during startup

Clear or delete YARN (MR2) application queue

QUESTION

Copy a file from local machine to docker container

Asked 2021-Jul-15 at 11:41

I am following this example:

I find the namenode as follows:

...

ANSWER

Answered 2021-Jul-15 at 11:38

Remove the $ at the beginning. That's what $: command not found means. Easy to miss when copy pasting code

Source https://stackoverflow.com/questions/68393052

QUESTION

Apache Oozie throws ClassNotFoundException (org.apache.hadoop.conf.Configuration) during startup

Asked 2021-May-09 at 23:25

I built the Apache Oozie 5.2.1 from the source code in my MacOS and currently having trouble running it. The ClassNotFoundException indicates a missing class org.apache.hadoop.conf.Configuration but it is available in both libext/ and the Hadoop file system.

I followed the 1st approach given here to copy Hadoop libraries to Oozie binary distro. https://oozie.apache.org/docs/5.2.1/DG_QuickStart.html

I downloaded Hadoop 2.6.0 distro and copied all the jars to libext before running Oozie in addition to other configs, etc as specified in the following blog.

https://www.trytechstuff.com/how-to-setup-apache-hadoop-2-6-0-version-single-node-on-ubuntu-mac/

This is how I installed Hadoop in MacOS. Hadoop 2.6.0 is working fine. http://zhongyaonan.com/hadoop-tutorial/setting-up-hadoop-2-6-on-mac-osx-yosemite.html

This looks pretty basic issue but could not find why the jar/class in libext is not loaded.

OS: MacOS 10.14.6 (Mojave)
JAVA: 1.8.0_191
Hadoop: 2.6.0 (running in the Mac)

...

ANSWER

Answered 2021-May-09 at 23:25

I was able to sort the above issue and few other ClassNotFoundException by copying the following jar files from extlib to lib. Both folder are in oozie_install/oozie-5.2.1.

libext/hadoop-common-2.6.0.jar
libext/commons-configuration-1.6.jar
libext/hadoop-mapreduce-client-core-2.6.0.jar
libext/hadoop-hdfs-2.6.0.jar

While I am not sure how many more jars need to be moved from libext to lib while I try to run an example workflow/job in oozie. This fix brought up Oozie web site at http://localhost:11000/oozie/

I am also not sure why Oozie doesn't load the libraries in the libext/ folder.

Source https://stackoverflow.com/questions/67462448

QUESTION

Clear or delete YARN (MR2) application queue

Asked 2020-Jul-08 at 05:39

I am using Cloudera Hadoop (CDH 5.16.2) for testing purpose. I ran the following map-reduce application two days ago:

...

ANSWER

Answered 2020-Jul-08 at 05:39

In my case, I finally figured out that my cluster was actually attacked. It happened because the Azure Network Security Group (NSG) was not configured properly. This also resulted in high-bandwidth charges (data transfer out) though I got that waived-off after requesting Azure team. After I restricted both the inbound and outbound traffic, everything got sorted. I killed the applications that were in queue and then they never appeared again.

I was checking online and it seems Hadoop YARN-based remote code execution (RCE) are actually quite common. So kindly make sure your NSG is configured properly.

Ref:

Source https://stackoverflow.com/questions/62216568

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install hadoop-mapreduce-examples

You can download it from GitHub.
You can use hadoop-mapreduce-examples like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the hadoop-mapreduce-examples component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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