hbase | 易学教程

Adding Jar File to WEB-INF/lib

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问题 I new in Eclipse,Java and Linux. I search about this issue but I don't reach to answer. I want to write a program that manipulate HBase Tables. So I have some Jar files that they related to the HBase. In ordinary Java application I add Jar files through following instruction Build Path -> Configuration Build Path -> Add External Jars So in Dynamic Web Project sound like different. after some search I understand the Jar files must be added in WEB-INF/lib or in %TOMCAT_HOME%/lib. so I get

HBase as web app backend

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问题 Can anyone advise if it is a good idea to have HBase as primary data source for web-based application? My primary concern is HBase's response time to queries. Is it possible to have sub-second response? edit: more details about the app itself. Amount of data: ~500GB of text data, expect to reach 1TB soon Number of concurrent users using the app: up to 50 The app will be used to present reports about data stored in HBase, like how many times keyword "X" occured in last 24h. For ~80% of

Hbase connection about zookeeper error

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问题 Environment : Ubuntu 14.04 , hadoop-2.2.0 , hbase-0.98.7 when i start hadoop and hbase(single node mode), both all success (I also check the website 8088 for hadoop, 60010 for hbase) jps 4507 SecondaryNameNode 5350 HRegionServer 4197 NameNode 4795 NodeManager 3948 QuorumPeerMain 5209 HMaster 4678 ResourceManager 5831 Jps 4310 DataNode but when i check hbase-hadoop-master-localhost.log, i found a information following 2014-10-23 14:16:11,392 INFO [main-SendThread(localhost:2181)] zookeeper

HBase:面试题小结

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1.HBase的基本介绍 a .Hbase是建立在hdfs之上的一个数据库， b .不支持join等SQL复杂操作 c .支持的数据类型：byte[]， d .依靠横向扩展，一个表可以有上十亿行，上百万列。 e .面向列(族)的存储和权限控制 f .对于为空(null)的列，并不占用存储空间，是一个稀疏表。 2.HBASE的适用场景海量数据、精确查询、快速返回海量数据：指的是数据量的背景精确查询：业务场景快速返回：是业务对时效性的要求 3.Hbase和Hadoop之间的关系加粗样式 HDFS：海量数据存储，适合一次性扫描大量数据。适合一次写入多次读取不适合频繁更新的数据 HBASE：适用一次扫描少量数据。适合多次写入多次读取支持数据更新支持删除数据 4.Hbase与RDBMS的关系 RDBMS ：支持SQL查询支持事务支持Join HBASE ：不支持SQL查询不支持事务不支持Join 5. Hbase详细架构 Client：访问数据的入口，包含访问hbase的API接口,维护着一些cache来加快对hbase的访问 Zookeepe 来源： CSDN 作者：真情流露哦呦链接： https://blog.csdn.net/weixin_43563705/article/details/103760469

Handling Images,Video and audio types using hbase

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问题 Anybody have any idea about,How to handle unstructured data like Audio,Video and Images using Hbase.I tried for this alot but i didn't get any idea.please any help is appreciated. 回答1: Option 1: convert image to byte array and you can prepare put request and insert to table. Similarly audio and video files also can be achieved. See https://docs.oracle.com/javase/7/docs/api/javax/imageio/package-summary.html import javax.imageio.ImageIO; /* * Convert an image to a byte array */ private byte[]

【转】大数据【九十五】Hbase【五】--HBase介绍和工作原理

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　HBase是一个分布式的、面向列的开源数据库，该技术来源于 Fay Chang 所撰写的Google论文“Bigtable：一个结构化数据的分布式存储系统”。就像Bigtable利用了Google文件系统（File System）所提供的分布式数据存储一样，HBase在Hadoop之上提供了类似于Bigtable的能力。HBase是Apache的Hadoop项目的子项目。HBase不同于一般的关系数据库，它是一个适合于非结构化数据存储的数据库。另一个不同的是HBase基于列的而不是基于行的模式。 1、Hadoop生太圈　　通过Hadoop生态圈，可以看到HBase的身影，可见HBase在Hadoop的生态圈是扮演这一个重要的角色那就是实时、分布式、高维数据的数据存储； 2、HBase简介　　– HBase – Hadoop Database，是一个高可靠性、高性能、面向列、可伸缩、实时读写的分布式数据库　　– 利用Hadoop HDFS作为其文件存储系统,利用Hadoop MapReduce来处理 HBase中的海量数据,利用Zookeeper作为其分布式协同服务　　– 主要用来存储非结构化和半结构化的松散数据（列存NoSQL数据库） 3、HBase数据模型　　以关系型数据的思维下会感觉，上面的表格是一个5列4行的数据表格，但是在HBase中这种理解是错误的

hbase how to choose pre split strategies and how its affect your rowkeys

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问题 I am trying to pre split hbase table. One the HbaseAdmin java api is to create an hbase table is function of startkey, endkey and number of regions. Here's the java api that I use from HbaseAdmin void createTable(HTableDescriptor desc, byte[] startKey, byte[] endKey, int numRegions) Is there any recommendation on choosing startkey and endkey based on dataset? My approach is lets say we have 100 records in dataset. I want data divided approximately in 10 regions so each will have approx 10

hbase how to choose pre split strategies and how its affect your rowkeys

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hbase how to choose pre split strategies and how its affect your rowkeys

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Row pagination with HBase

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问题 Is there a way to do pagination in HBase based on rowkeys? I wanted to have the same effect as I do in SQL with SELECT * FROM table LIMIT 10 OFFSET 10 . If that's not possible, how should I best design my rowkeys to query appropriately? 回答1: You can make use of PageFilter to do that. When you create the instance of PageFilter, you specify a pageSize parameter, which controls how many rows per page should be returned. Filter filter = new PageFilter(10); And if you wish to do it through the