serialization in hadoop

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One of the solutions to Hadoop small files Hadoop archive

Introduction HDFs is not good at storing small files, because each file at least one block, each block of metadata will occupy memory in the Namenode node, if there are such a large number of small files, they will eat the Namenode node's large amount of memory. Hadoop archives can effectively handle these issues, he can archive multiple files into a file, archived into a file can also be transparent access to each file, and can be used as a mapreduce

Hadoop In The Big Data era (II): hadoop script Parsing

Hadoop In The Big Data era (1): hadoop Installation If you want to have a better understanding of hadoop, you must first understand how to start or stop the hadoop script. After all,Hadoop is a distributed storage and computing framework.But how to start and manage t

What is Java serialization, and how do I implement Java serialization? __java

Serialization is the process of converting an object's state to a format that can be persisted or transmitted. To be clear, you can output to a file with an object output stream. If the output is not serialized. It could be messy! Implementation is the implementation of the Java.io.Serializable interface. This interface does not need to implement any specific methods. Just implements Java.io.Serializable. The se

The most comprehensive history of hadoop, hadoop

The most comprehensive history of hadoop, hadoop The course mainly involves the technical practices of Hadoop Sqoop, Flume, and Avro. Target Audience 1. This course is suitable for students who have basic knowledge of java, have a certain understanding of databases and SQL statements, and are skilled in using linux systems. It is especially suitable for those who

Java basics-serialization and java serialization

Java basics-serialization and java serialization 1. java serialization When two processes perform remote communication, they can send different types of data to each other. Regardless of the type of data, it is transmitted in binary sequence. The sender needs to convert the Java object into a byte sequence before it can be transmitted over the network. The receiv

Serialization, serialization, and deserialization

Serialization, serialization, and deserialization1. What is serialization? Writing an object in the memory to the hard disk is serialized, which is no different from the general output, but the output data is an object, not a general text.2. Functions of serialization Because the storage of data in the memory is tempor

Why serialization and serialization operations [included]

Indexed 1: My understanding:For example, a class is used to describe a contract, and after the class is instantiated, the field in the class stores the contract information, if you want to send the instance of this class to another machine, another form, or want to save this class for later use (persistence object ), this class can be serialized (serialization is actually a message stream), transmitted or saved, and then deserialized to regenerate t

Hadoop custom RPC protocol

RPC is called a remote process call. As hadoop is a distributed system, underlying communication libraries must implement basic RPC functions. Hadoop RPC plays the role of the underlying communication module in hadoop. For example, communication and coordination between NN and DN, am and RM are completed by hadoop RPC.

Comparison of Java native serialization and Kryo serialization performance

Brief introductionIn recent years, a variety of new and efficient serialization methods have continued to refresh the upper limit of serialization performance, most typically including: Specifically for the Java language: KRYO,FST, etc. Cross-lingual: Protostuff,protobuf,thrift,avro,msgpack, etc. Most of the performance of these serialization me

Hadoop (CDH4 release) Cluster deployment (deployment script, namenode high availability, hadoop Management)

Preface After a while of hadoop deployment and management, write down this series of blog records. To avoid repetitive deployment, I have written the deployment steps as a script. You only need to execute the script according to this article, and the entire environment is basically deployed. The deployment script I put in the Open Source China git repository (http://git.oschina.net/snake1361222/hadoop_scripts ). All the deployment in this article is b

Cluster configuration and usage skills in hadoop-Introduction to the open-source framework of distributed computing hadoop (II)

As a matter of fact, you can easily configure the distributed framework runtime environment by referring to the hadoop official documentation. However, you can write a little more here, and pay attention to some details, in fact, these details will be explored for a long time. Hadoop can run on a single machine, or you can configure a cluster to run on a single machine. To run on a single machine, you only

. Net serialization and deserialization,. net serialization

. Net serialization and deserialization,. net serialization 1. serialization deserialization In C #, if you need to: store objects of classes with complex structures, or transmit objects to remote client programs over the network, serialization is required, deserialization (Seriali

Java serialization and deserialization, Java serialization

Java serialization and deserialization, Java serialization 1. What is serialization? Why serialization? JavaSerializationIt refers to the process of converting an object into a byte sequence, andDeserializationThe process of converting the byte sequence to the target object only. We all know that the text, images, audi

Things about Hadoop (a) A preliminary study on –hadoop

ObjectiveWhat is Hadoop?In the Encyclopedia: "Hadoop is a distributed system infrastructure developed by the Apache Foundation." Users can develop distributed programs without knowing the underlying details of the distribution. Take advantage of the power of the cluster to perform high-speed operations and storage. ”There may be some abstraction, and this problem can be re-viewed after learning the various

Hadoop Learning Roadmap

, and provide high-performance distributed services. Apache Mahout: A distributed framework for machine learning and data mining based on Hadoop. Mahout implements some data mining algorithms with MapReduce, and solves the problem of parallel mining. Apache Cassandra: is a set of open source distributed NoSQL database system. It was originally developed by Facebook to store simple format data, a data model for Google BigTable and a fully distribut

Hadoop technology Insider: in-depth analysis of mapreduce Architecture Design and Implementation Principles

mapreduce design goals/282.3 mapreduce programming model Overview/292.3.1 mapreduce Programming model Overview/292.3.2 mapreduce programming instance/312.4 hadoop basic architecture/322.4.1 HDFS architecture/332.4.2 hadoop mapreduce architecture/342.5 hadoop mapreduce job lifecycle/362.6 Summary/38 part 2 mapreduce Programming Model chapter 2 mapreduce programmi

Practice 1: Install hadoop in a single-node instance cdh4 cluster of pseudo-distributed hadoop

Hadoop consists of two parts: Distributed File System (HDFS) Distributed Computing framework mapreduce The Distributed File System (HDFS) is mainly used for the Distributed Storage of large-scale data, while mapreduce is built on the Distributed File System to perform distributed computing on the data stored in the distributed file system. Describes the functions of nodes in detail. Namenode: 1. There is only one namenode in the

Use RawComparator to accelerate Hadoop programs

In the previous two articles [1] [2], we introduced the knowledge of Hadoop serialization, including the Writable interface and Writable object, and how to compile a customized Writable class, in-depth analysis of the occupied byte space and the composition of the byte sequence after the Writable class serialization. We point out that

Hadoop 2.7.2 (hadoop2.x) uses Ant to make Eclipse Plug-ins Hadoop-eclipse-plugin-2.7.2.jar

Previously introduced me in Ubuntu under the combination of virtual machine Centos6.4 build hadoop2.7.2 cluster, in order to do mapreduce development, to use eclipse, and need the corresponding Hadoop plugin Hadoop-eclipse-plugin-2.7.2.jar, first of all, in the official Hadoop installation package before hadoop1.x with Eclipse Plug-ins, And now with the increase

What can be done to make the Java serialization mechanism more secure? Security principles we follow to make Java serialization Safe.__java

Overview Java serialization serialization, we should be not unfamiliar. Its main function is to transform the state of an object into a sequence of bytes to facilitate the persistence of objects or network transmission. The reverse is the reverse process of deserialization. All the developers have to do is implement the Serializable interface and then call the Objectoutputstream/objectinputstream Writeobje

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