Hadoop itself is written in Java. Therefore, writing mapreduce to hadoop naturally reminds people of Java. However, Hadoop has a contrib called hadoopstreaming, which is a small tool that provides streaming support for hadoop so that any executable
Use PHP and Shell to write Hadoop MapReduce programs. So that any executable program supporting standard I/O (stdin, stdout) can become hadoop er or reducer. For example, copy the code as follows: hadoopjarhadoop-streaming.jar-input makes any
Using PHP to write a mapreduce program for HadoopHadoop Stream
Although Hadoop is written in Java, Hadoop provides a stream of Hadoop, and Hadoop streams provide an API that allows users to write map functions and reduce functions in any
So that any executable program supporting standard I/O (stdin, stdout) can become hadoop er or reducer. For example:Copy codeThe Code is as follows:Hadoop jar hadoop-streaming.jar-input SOME_INPUT_DIR_OR_FILE-output
Enables any executable program that supports standard IO (stdin, stdout) to be the mapper or reducer of Hadoop. For example:
Copy CodeThe code is as follows:
Hadoop jar Hadoop-streaming.jar-input Some_input_dir_or_file-output Some_output_dir-mapper/
Enables any executable program that supports standard IO (stdin, stdout) to be a mapper or reducer of Hadoop. For example:
Copy Code code as follows:
Hadoop jar Hadoop-streaming.jar-input Some_input_dir_or_file-output
Although Hadoop is written in java, Hadoop provides a Hadoop stream, which provides an API that allows you to write map and reduce functions in any language.The key to Hadoop flow is that it uses the standard UNIX stream as the
Mapreduce has a php interface. Ask who knows the underlying source code. If you want to learn, some php and java interactive mapreduce has a php interface. Ask who knows the underlying source code, want to learn
There may be some php and java
MapReduce has PHP interface, ask the bottom source who knows where, want to learn
There will probably be some interaction between PHP and Java.
MapReduce has PHP interface, ask the bottom source who knows where, want to
Hadoop instance video tutorial-in-depth development of hadoopWhat is hadoop, why learning hadoop?Hadoop is a distributed system infrastructure developed by the Apache Foundation. You can develop distributed programs without understanding the details
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