voidPrint (javarddparseddata, Generalizedlinearmodel model) {Javapairrdd { DoublePrediction = Model.predict (Point.features ());//predicting training data with models return NewTuple2(Point.label (), prediction); }); Double MSE= Valuesandpreds.maptodouble ((tuple2//calculates the mean of the squared value of the difference between the predicted value and the actual valueSystem.out.println (Model.getclass (). GetName () + "training Mean squared Error =" +MSE);} Run result Linea
).
Mininfogain:
Type: double-precision.
Meaning: The minimum information gain required to split a node.
Mininstancespernode:
Type: integer type.
Meaning: The minimum number of instances that are included in a node since splitting.
Predictioncol:
Type: String type.
Meaning: The forecast result column name.
Rawpredictioncol:
Type: String type.
Meaning: Original forecast.
Seed
Type: Long integral type.
Meaning: Random seeds.
Subsamplingrate:
Type: double-precision.
Meaning: Learn a decision tree us
Spark example and spark example
1. Set up the Spark development environment in Java (fromHttp://www.cnblogs.com/eczhou/p/5216918.html)
1.1 jdk Installation
Install jdk in oracle. I installed jdk 1.7. After installing the new system environment variable JAVA_HOME, the variabl
Spark example: Sorting by array and spark example
Array sorting is a common operation. The lower performance limit of a comparison-based sorting algorithm is O (nlog (n), but in a distributed environment, we can improve the performance. Here we show the implementation of array sorting in
[Spark] [Python]spark example of obtaining Dataframe from Avro fileGet the file from the following address:Https://github.com/databricks/spark-avro/raw/master/src/test/resources/episodes.avroImport into the HDFS system:HDFs Dfs-put Episodes.avroRead in:Mydata001=sqlcontext.read.format ("Com.databricks.spark.avro"). Loa
configuration file are:
Run the ": WQ" command to save and exit.
Through the above configuration, we have completed the simplest pseudo-distributed configuration.
Next, format the hadoop namenode:
Enter "Y" to complete the formatting process:
Start hadoop!
Start hadoop as follows:
Use the JPS command that comes with Java to query all daemon processes:
Start hadoop !!!
Next, you can view the hadoop running status on the Web page used to monitor the cluster status in hadoop. The specific pa
[Spark] [Hive] [Python] [SQL] A small example of Spark reading a hive table$ cat Customers.txt1Alius2Bsbca3Carlsmx$ hiveHive>> CREATE TABLE IF not EXISTS customers (> cust_id String,> Name string,> Country String>)> ROW FORMAT delimited fields TERMINATED by ' \ t ';hive> Load Data local inpath '/home/training/customers.txt ' into table customers;Hive>exit$pyspark
. This chapter explains how to use external data sources to manipulate data in hive, parquet, MySQL, and integrated use8th Chapter Sparksql VisionThis chapter will explain the Spark's vision: Write less code, read less data, and let the optimizer automatically optimize the programThe 9th Chapter MU Lesson Net Diary actual combatThis chapter uses spark SQL to perform statistical analysis of each dimension of the access log for the master station, which
I. Introduction to Spark SQL External datasourceWith the release of Spark1.2, Spark SQL began to formally support external data sources. Spark SQL opens up a series of interfaces for accessing external data sources to enable developers to implement them.This allows spark SQL to support more types of data sources, such
Example of integrated development of Spring Boot with Spark and Cassandra systems, sparkcassandra
This article demonstrates how to use Spark as the analysis engine and Cassandra as the data storage, and use Spring Boot to develop the driver.
1. Prerequisites
Install Spark (Spark
There have also been recent studies using spark streaming for streaming. This article is a simple example of how to do spark streaming programming with the flow-based count of word counts.1. Dependent jar PackagesRefer to the article "Using Eclipse and idea to build the Scala+spark development environment," which speci
[Spark] [Python] Example of a dataframe in which a limited record is taken:SqlContext = Hivecontext (SC)PEOPLEDF = SqlContext.read.json ("People.json")Peopledf.limit (3). Show ()===[Email protected] ~]$ HDFs dfs-cat People.json{"Name": "Alice", "Pcode": "94304"}{"Name": "Brayden", "age": +, "Pcode": "94304"}{"Name": "Carla", "age": +, "Pcoe": "10036"}{"Name": "Diana", "Age": 46}{"Name": "Etienne", "Pcode":
allowlocal * flag Specifies whether the scheduler can run the computation on the driver rather than * shipping it Out to the cluster, for short actions like first (). */def Runjob[t, U:classtag] (Rdd:rdd[t], func: (Taskcontext, iterator[t]) = = U, Partitions:seq[int] , Allowlocal:boolean, Resulthandler: (Int, U) = = Unit) {if (Stopped.get ()) {throw new illegalstate Exception ("Sparkcontext have been Shutdown")} val callSite = getcallsite val cleanedfunc = Clean (func) loginfo ("Starting job
[Example of a limited record taken in Spark][python]dataframethe continuationIn [4]: Peopledf.select ("Age")OUT[4]: Dataframe[age:bigint]In [5]: Mydf=people.select ("Age")---------------------------------------------------------------------------Nameerror Traceback (most recent)----> 1 Mydf=people.select ("Age")Nameerror:name ' People ' is not definedIn [6]: Mydf=peopledf.select ("Age")In [7]: Mydf.take (3)
To see the next simplest example.
1. Increase in Pom.xml
2. Create a new class
Import static Spark. spark.*;
public class HelloWorld {public static void Main (string[] args) {Get ("/hello", (req, res)-> "Hello World");}}Run HelloWorld directly, visit Http://localhost:4567/hello, and the page will show Hello World
Even Java can write so concise ...
Two.
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