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mapreducepatterns | MapReduce Design Patterns | Architecture library

 by   adamjshook Java Version: v1.0.0 License: No License

 by   adamjshook Java Version: v1.0.0 License: No License

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kandi X-RAY | mapreducepatterns Summary

mapreducepatterns is a Java library typically used in Architecture applications. mapreducepatterns has no bugs, it has no vulnerabilities and it has low support. However mapreducepatterns build file is not available. You can download it from GitHub.
Repository for MapReduce Design Patterns (O’Reilly 2012) example source code.
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kandi-support Support

  • mapreducepatterns has a low active ecosystem.
  • It has 213 star(s) with 193 fork(s). There are 46 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 2 open issues and 1 have been closed. On average issues are closed in 164 days. There are no pull requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of mapreducepatterns is v1.0.0
mapreducepatterns Support
Best in #Architecture
Average in #Architecture
mapreducepatterns Support
Best in #Architecture
Average in #Architecture

quality kandi Quality

  • mapreducepatterns has 0 bugs and 0 code smells.
mapreducepatterns Quality
Best in #Architecture
Average in #Architecture
mapreducepatterns Quality
Best in #Architecture
Average in #Architecture

securitySecurity

  • mapreducepatterns has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • mapreducepatterns code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
mapreducepatterns Security
Best in #Architecture
Average in #Architecture
mapreducepatterns Security
Best in #Architecture
Average in #Architecture

license License

  • mapreducepatterns does not have a standard license declared.
  • Check the repository for any license declaration and review the terms closely.
  • Without a license, all rights are reserved, and you cannot use the library in your applications.
mapreducepatterns License
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mapreducepatterns License
Best in #Architecture
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buildReuse

  • mapreducepatterns releases are available to install and integrate.
  • mapreducepatterns has no build file. You will be need to create the build yourself to build the component from source.
  • mapreducepatterns saves you 2207 person hours of effort in developing the same functionality from scratch.
  • It has 4830 lines of code, 278 functions and 41 files.
  • It has low code complexity. Code complexity directly impacts maintainability of the code.
mapreducepatterns Reuse
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Average in #Architecture
mapreducepatterns Reuse
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Average in #Architecture
Top functions reviewed by kandi - BETA

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

  • Main entry point .
    • Get the job configuration .
      • The main entry point for the join operation .
        • Main entry point .
          • Creates a simple counting job .
            • Submit a parallel job .
              • Gets the Wikipedia page URL from a Wikipedia page .
                • transforms xml into map
                  • Print command .
                    • Calculate optimal bloom filter size .

                      Get all kandi verified functions for this library.

                      Get all kandi verified functions for this library.

                      mapreducepatterns Key Features

                      Repository for MapReduce Design Patterns (O'Reilly 2012) example source code

                      Community Discussions

                      Trending Discussions on mapreducepatterns
                      • How does RecordReader send data to mapper in Hadoop
                      Trending Discussions on mapreducepatterns

                      QUESTION

                      How does RecordReader send data to mapper in Hadoop

                      Asked 2018-Dec-04 at 11:04

                      I'm new to Hadoop and currently I'm learning mapreduce design pattern from Donald Miner & Adam Shook MapReduce Design Pattern book. So in this book there is Cartesian Product Pattern. My question is:

                      1. When does record reader send data to mapper?
                      2. Where is the code that send the data to mapper?

                      What I see is next function in CartesianRecordReader class read both split without sending the data.

                      Here is the source code https://github.com/adamjshook/mapreducepatterns/blob/master/MRDP/src/main/java/mrdp/ch5/CartesianProduct.java

                      That's all, thanks in advance :)

                      ANSWER

                      Answered 2018-Dec-04 at 07:27

                      When does record reader send data to mapper?

                      Let me answer by giving you an idea how how the mapper and the RecordReader are related. This is the Hadoop code that sends data to the mapper. 1

                        RecordReader<K1, V1> input;
                      
                        K1 key = input.createKey();
                        V1 value = input.createValue();
                      
                        while (input.next(key, value)) {
                          // map pair to output
                          mapper.map(key, value, output, reporter);
                          if(incrProcCount) {
                            reporter.incrCounter(SkipBadRecords.COUNTER_GROUP, 
                                SkipBadRecords.COUNTER_MAP_PROCESSED_RECORDS, 1);
                          }
                        }
                      

                      Basically, the Hadoop will call next until it returns false, and at every call key and value will obtain new values. Key being normally the bytes read so far and value the next line in the file.

                      Where is the code that send the data to mapper?

                      That code is at the source code of hadoop (Probably at the MapContextImpl class) but it resembles what I have wrote in the code snippet.

                      EDIT : The source code is at MapRunner.

                      Source https://stackoverflow.com/questions/53364195

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

                      Vulnerabilities

                      No vulnerabilities reported

                      Install mapreducepatterns

                      You can download it from GitHub.
                      You can use mapreducepatterns 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 mapreducepatterns 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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