often used are supported.Thanks to its strong performance in data science, the Python language fans are all over the world. Now it's time to meet the powerful distributed memory computing framework Spark, two areas of the strong come together. Nature can touch more powerful sparks (spark translates into Sparks), so Pyspark is the protagonist of this section.In the Hadoop release, both CDH5 and HDP2 have in
Spark Communication Module
1, Spark Cluster Manager can have local, standalone, mesos, yarn and other deployment methods, in order to
Centralized communication mode
1, RPC remote produce call
Spark Communication mechanism:
The advantages and characteristics of Akka are as follows:
1, parallel and distributed: Akka in design with asynchronous communication and dis
Step 1: software required by the spark cluster;
Build a spark cluster on the basis of the hadoop cluster built from scratch in Articles 1 and 2. We will use the spark 1.0.0 version released in May 30, 2014, that is, the latest version of spark, to build a spark Cluster Based
Start and view the cluster status
Step 1: Start the hadoop cluster, which is explained in detail in the second lecture. I will not go into details here:
After the JPS command is run on the master machine, the following process information is displayed:
When JPS is used on slave1 and slave2, the following process information is displayed:
Step 2: Start the spark Cluster
On the basis of the successful start of the hadoop cluster, to start the
Install spark
Spark must be installed on the master, slave1, and slave2 machines.
First, install spark on the master. The specific steps are as follows:
Step 1: Decompress spark on the master:
Decompress the package directly to the current directory:
In this case, create the spa
Step 1: Test spark through spark Shell
Step 1:Start the spark cluster. This is very detailed in the third part. After the spark cluster is started, webui is as follows:
Step 2:Start spark shell:
In this case, you can view the shell in the following Web console:
Step 3:Co
Install spark
Spark must be installed on the master, slave1, and slave2 machines.
First, install spark on the master. The specific steps are as follows:
Step 1: Decompress spark on the master:
Decompress the package directly to the current directory:
In this case, create the
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command:Add the following content, including the bin directory to the pathMake it effective with source1.4 Verification
The input Scala version can be displayed as follows:Scala can also be programmed directly with Scala:2. Install Spark 2.1 Downloads Spark
Download Address:Http://spark.apache.org/downloads.htmlFor learning purposes, I downloaded the pre-compiled version 1.6.2.2 Decompression
The download
Tags: spark books spark hotspot Spark Technology spark tutorial
The command to end historyserver is as follows:
Step 4: Verify the hadoop distributed Cluster
First, create two directories on the HDFS file system. The creation process is as follows:
/Data/wordcount in HDFS is used to store the data f
Introduction to spark Basics, cluster build and Spark ShellThe main use of spark-based PPT, coupled with practical hands-on to enhance the concept of understanding and practice.Spark Installation DeploymentThe theory is almost there, and then the actual hands-on experiment:Exercise 1 using Spark Shell (native mode) to
Next package, use Project structure's artifacts:Using the From modules with dependencies:Select Main Class:Click "OK":Change the name to Sparkdemojar:Because Scala and spark are installed on each machine, you can delete both Scala and spark-related jar files:Next Build:Select "Build Artifacts":The rest of the operation is to upload the jar package to the server, and then execute the
Next package, use Project structure's artifacts:Using the From modules with dependencies:Select Main Class:Click "OK":Change the name to Sparkdemojar:Because Scala and spark are installed on each machine, you can delete both Scala and spark-related jar files:Next Build:Select "Build Artifacts":The rest of the operation is to upload the jar package to the server, and then execute the
Create a Scala idea project:Click "Next":Click "Finish" to complete the project creation:To modify an item's properties:First modify the Modules option:Create two folders under SRC and change their properties to source:Then modify the libraries:Because you want to develop the spark program, you need to bring in the jar packages that spark needs to develop:After the import package is complete, create a packa
Create a Scala idea project:Click "Next":Click "Finish" to complete the project creation:To modify an item's properties:First modify the Modules option:Create two folders under SRC and change their properties to source:Then modify the libraries:Because you want to develop the spark program, you need to bring in the jar packages that spark needs to develop:After the import package is complete, create a packa
Step 4: build and test the spark development environment through spark ide
Step 1: Import the package corresponding to spark-hadoop, select "file"> "project structure"> "Libraries", and select "+" to import the package corresponding to spark-hadoop:
Click "OK" to confirm:
Click "OK ":
After idea
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Next, use mr-jobhistory-daemon.sh to start jobhistory Server:
650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/4C/D0/wKioL1RFum3gmV-tAAEAGK9JgLU703.jpg "style =" float: none; "Title =" 49.png" alt = "wKioL1RFum3gmV-tAAEAGK9JgLU703.jpg"/>
After startup, you can view the task execution history in jobhistory on the Web Console through http: // spar
Open idea under the SRC under main under Scala right click to create a Scala class named Simpleapp, the content is as followsImportOrg.apache.spark.SparkContextImportOrg.apache.spark.sparkcontext._ImportOrg.apache.spark.SparkConfObjectSimpleapp{defMain(Args:array[string]) {ValLogFile ="/home/spark/opt/spark-1.2.0-bin-hadoop2.4/readme.md"//should be some file on your system Valconf =NewSparkconf (). Setap
This article focuses on some of the typical problems I have encountered since using spark and how to solve them, hoping to help the students who meet the same problem.1. Spark environment or configuration relatedQ:in the Spark Client Profile spark-defaults.conf, how should spark.executor.memory and Spark.cores.max be c
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