The previous article "Apache Spark Learning: Deploying Spark to Hadoop 2.2.0" describes how to use MAVEN compilation to build spark jar packages that run directly on the Hadoop 2.2.0, and on this basis, Describes how to build an spark integrated development environment with
Original address: http://blog.jobbole.com/?p=89446I first heard of spark at the end of 2013, when I was interested in Scala, and Spark was written in Scala. After a while, I made an interesting data science project, and it tried to predict surviving on the Titanic . This proves to be a good way to learn more about spark content and programming. I highly recommend
You are welcome to reprint it. Please indicate the source, huichiro.Wedge
Hive is an open source data warehouse tool based on hadoop. It provides a hiveql language similar to SQL, this allows upper-layer data analysts to analyze massive data stored in HDFS without having to know too much about mapreduce. This feature has been widely welcomed.
An important module in the overall hive framework is the execution module, which is implemented using the mapreduce computing framework in hadoop. Therefor
Savetocassandra the stored procedure that triggered the data
Another place worth documenting is that if the table created in Cassandra uses the UUID as primary key, use the following function in Scala to generate the UUIDimport java.util.UUIDUUID.randomUUIDVerification stepsUse Cqlsh to see if the data is actually written to the TEST.KV table.SummaryThis experiment combines the following knowledge
Spark SQL
{case (key, value) = > value.tostring (). Split ("\\s+"); Map (Word = > (word, 1)). Reducebykey (_ + _)
Where the Flatmap function converts a record into multiple records (One-to-many relationships), the map function converts a record to another record (one-to-one relationship), and the Reducebykey function divides the same data into a bucket and calculates it in key units. The specific meaning of these functions can be referred to: Spark transformati
the source reading, we need to focus on the following two main lines.
static View is RDD, transformation and action
Dynamic View is the life of a job, each job is divided into multiple stages, each stage can contain more than one RDD and its transformation, How these stages are mapped into tasks is distributed into cluster
References (Reference)
Introduction to Spark Internals http://files.meetup.com/3138542/dev-meetup-dec-
http broadcast
spark.broadcast.port
jetty-based, Torrentbroadcast does not use this port, it sends data through the Block manager
executor
driver
random
spark.replclassserver.port
jetty-based, Only for spark shell
Executor/driver
Executor/driver
Random
Block Manager Port
Spark.blockManager.port
Raw socket via Serversocketchannel
documentation.SummaryIn the source reading, we need to focus on the following two main lines.
static View is RDD, transformation and action
Dynamic View is the life of a job, each job is divided into multiple stages, each stage can contain more than one RDD and its transformation, How these stages are mapped into tasks is distributed into cluster
References (Reference)
Introduction to Spark Internals http://files.meetup.com
will store intermediate results in the/tmp directory while computing, Linux now supports TMPFS, in fact, it is simply to mount the/tmp directory into memory.Then there is a problem, the middle result is too much cause the/tmp directory is full and the following error occurredNo Space left on the deviceThe workaround is to not enable TMPFS for the TMP directory, modify the/etc/fstabQuestion 2Sometimes you may encounter Java.lang.OutOfMemory, unable to create new native thread error, which causes
. Assume that you use git to synchronize the latest source code.
git clone https://github.com/apache/spark.git
Generate an idea Project
sbt/sbt gen-idea
Import Spark Source Code
1. Select File-> Import project and specify the Spark Source Code directory in the pop-up window.
2. Select SBT project as the project type and click Next
3. Click Finish in the new pop
Https://www.iteblog.com/archives/1624.html
Whether we need another new data processing engine. I was very skeptical when I first heard of Flink. In the Big data field, there is no shortage of data processing frameworks, but no framework can fully meet the different processing requirements. Since the advent of Apache Spark, it seems to have become the best framework for solving most of the problems today, s
monitoring of computing resources, restarting failed tasks based on monitoring results, or re-distributed task once a new node joins cluster.This part of the content needs to refer to yarn's documentation.SummaryIn the source reading, we need to focus on the following two main lines.
static View is RDD, transformation and action
Dynamic View is the life of a job, each job is divided into multiple stages, each stage can contain more than one RDD and its transformation, How these sta
Summary: The advent of Apache Spark has made it possible for ordinary people to have big data and real-time data analysis capabilities. In view of this, this article through hands-on Operation demonstration to lead everyone to learn spark quickly. This article is the first part of a four-part tutorial on the Apache
You are welcome to reprint it. Please indicate the source, huichiro.Summary
There is nothing to say about source code compilation. For Java projects, as long as Maven or ant simple commands are clicked, they will be OK. However, when it comes to spark, it seems that things are not so simple. According to the spark officical document, there will always be compilation errors in one way or another, which is an
, * * w‘ = w - thisIterStepSize * (gradient + regGradient(w)) * Note that regGradient is function of w * * If we set gradient = 0, thisIterStepSize = 1, then * * regGradient(w) = w - w‘ * * TODO: We need to clean it up by separating the logic of regularization out * from updater to regularizer. */ // The following gradientTotal is actually the regularization part of gradient. // Will add the gradientSum computed fr
This article, it is necessary to read, write well. But after looking, don't forget to check out the Apache Spark website. Because this article understanding or with the source code, official documents inconsistent. A little mistake! "The Cnblogs Code Editor does not support Scala, so the language keyword is not highlighted"In data analysis, processing Key,value pair data is a very common scenario, for examp
Apache Spark Memory Management detailedAs a memory-based distributed computing engine, Spark's memory management module plays a very important role in the whole system. Understanding the fundamentals of spark memory management helps to better develop spark applications and perform performance tuning. The purpose of thi
applications.SummaryIn this blog post, you learned how the MapR converged Data Platform integrates Hadoop and Spark with real-time database CA Pabilities, global event streaming, and scalable enterprise storage.References and more information:
Free Online training in MapR Streams, Spark, and HBase at learn.mapr.com
Getting Started with MapR Streams Blog
Ebook:new Designs Using
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