hbase

hbase-0.98整合hadoop-2.6,附java操作代码

喜欢而已 提交于 2019-12-12 14:06:14
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> cd /opt/hbase-0.98.13-hadoop2/conf vi hbase-env.sh export JAVA_HOME=/opt/jdk1.7.0_75 vi hbase-site.xml <!--设置hbase根目录,master为机器的hostname--> <property> <name>hbase.rootdir</name> <value>hdfs://master:9000/hbase</value> </property> <!--完全分布式模式--> <property> <name>hbase.cluster.distributed</name> <value>true</value> </property> <!--配置zookeeper集群地址--> <property> <name>hbase.zookeeper.quorum</name> <value>master</value> </property> <!--配置zookeeper数据存放位置--> <property> <name>hbase.zookeeper.property.dataDir</name> <value>/opt/zookeeper-3.4.6/tmp/data</value> <

Is there a possibility to keep a single map store and use for multiple maps in hazelcast

纵饮孤独 提交于 2019-12-12 13:27:15
问题 Currently am using Hazelcast and persistence database as Hbase, So far I have 10 maps, for each map am using a map store, So Am using 10 mapstore classes (i.e) In all the 10 classes am implementing the MapStore. It creates a complexity in maintenance. So What I did is, I kept a generic map store and implemented the same class for all the maps, It has the ability to accept it, To make it clear, I did something like Map1 - com.test.GenericMapStore Map2 - com.test.GenericMapStore Map3 - com.test

HBase>HBase概述

感情迁移 提交于 2019-12-12 13:23:27
文章目录 1、HBase基本介绍 2、HBase与Hadoop的关系 1、HDFS 2、HBase 3、RDBMS与HBase的对比 1、关系型数据库 2、HBase 4、HBase特征简要 5、HBase的基础架构 1、HBase基本介绍 简介 hbase是bigtable的开源java版本。是 建立在hdfs之上 ,提供高可靠性、高性能、列存储、可伸缩、实时读写nosql的 数据库系统 。 它介于nosql和RDBMS之间,仅能通过主键(row key)和主键的range来检索数据,仅支持单行事务(可通过hive支持来实现多表join等复杂操作)。 主要用来存储结构化和半结构化的松散数据。 Hbase查询数据功能很简单,不支持join等复杂操作,不支持复杂的事务(行级的事务) Hbase中支持的数据类型:byte[] 与hadoop一样,Hbase目标主要依靠 横向扩展 ,通过不断增加廉价的商用服务器,来增加计算和存储能力。 HBase中的表一般有这样的特点: 大:一个表可以有上十亿行,上百万列 面向列:面向列(族)的存储和权限控制,列(族)独立检索。 稀疏:对于为空(null)的列,并不占用存储空间,因此,表可以设计的非常稀疏。 传统数据表 官方网站: http://hbase.apache.org 2、HBase与Hadoop的关系 1、HDFS 为分布式存储提供文件系统

Google Cloud Bigtable Client Connection Pooling

假装没事ソ 提交于 2019-12-12 12:48:08
问题 I've done a load test against Google Cloud Bigtable by making a dummy web app that handle requests for writing and reading data to and from Bigtable. At the beginning, I was only using a single Bigtable connection as a singleton and reusing it across all threads (requests). When I increased the number of requests, I noticed that the performance was getting slower. Somehow, instead of increasing the number of nodes, I got the idea of making multiple Bigtable connections and just randomly

HBase shell 操作

别来无恙 提交于 2019-12-12 11:31:55
1、进入HBase客户端命令操作界面 $ bin/hbase shell 2、查看帮助命令 hbase(main):001:0> help 3、查看当前数据库中有哪些表 hbase(main):002:0> list 4、创建一张表 创建user表,包含info、data两个列族 hbase(main):010:0> create 'user', 'info', 'data' 或者 hbase(main):010:0> create 'user', {NAME => 'info', VERSIONS => '3'},{NAME => 'data'} 5、添加数据操作 向user表中插入信息,row key为rk0001,列族info中添加name列标示符,值为zhangsan hbase(main):011:0> put 'user', 'rk0001', 'info:name', 'zhangsan' 向user表中插入信息,row key为rk0001,列族info中添加gender列标示符,值为female hbase(main):012:0> put 'user', 'rk0001', 'info:gender', 'female' 向user表中插入信息,row key为rk0001,列族info中添加age列标示符,值为20 hbase(main):013:0> put

HBase one to many 'relationship' storage

醉酒当歌 提交于 2019-12-12 10:58:21
问题 I'm pondering the best way to implement a one to many relationship in HBase. Say an ACCOUNT has many TRANSACTION(s). Is it better to a) Add columns to a transactions: column family on the ACCOUNT table, i.e. transactions:1:amount, transactions:2:amount b) Only store the key(s) of each TRANSACTION relating to an account in in the transactions: column family of ACCOUNT, and do a lookup of each transaction found on a separate TRANSACTION table? 回答1: Generally, option a, is the better approach.

Querying Hbase efficiently

不羁的心 提交于 2019-12-12 10:58:04
问题 I'm using Java as a client for querying Hbase. My Hbase table is set up like this: ROWKEY | HOST | EVENT -----------|--------------|---------- 21_1465435 | host.hst.com | clicked 22_1463456 | hlo.wrld.com | dragged . . . . . . . . . The first thing I need to do is get a list of all ROWKEYs which have host.hst.com associated with it. I can create a scanner at Column host and for each row value with column value = host.hst.com I will add the corresponding ROWKEY to the list. Seems pretty

How do I access HBase table in Hive & vice-versa?

心已入冬 提交于 2019-12-12 10:37:47
问题 As a developer, I've created HBase table for our project by importing data from existing MySQL table using sqoop job . The problem is our data analyst team are familiar with MySQL syntax, implies they can query HIVE table easily. For them, I need to expose HBase table in HIVE. I don't want to duplicate data by populating data again in HIVE. Also, duplicating data might have consistency issues in future. Can I expose HBase table in HIVE without duplicating data ? If yes, how do I do it? Also,

MRUnit passing values in hbase Result object

六眼飞鱼酱① 提交于 2019-12-12 10:26:24
问题 I am testing my mapper with MRUnit. I am passing key and list of values as input to the mapper from the test class. The problem is : String key=1234_abc; ArrayList<KeyValue> list = new ArrayList<KeyValue>(); KeyValue k1 = new KeyValue(Bytes.toBytes(key),"cf".getBytes(), "Val1".getBytes(),Bytes.toBytes("abc.com")); KeyValue k2 = new KeyValue(Bytes.toBytes(key), "cf".getBytes(), "Val2".getBytes(),Bytes.toBytes("165")); Result result = new Result(list); mapDriver.withInput(key, result); The

Hbase环境搭建最全指南

坚强是说给别人听的谎言 提交于 2019-12-12 10:19:12
HBase集群环境配置 一、集群规划 二、前置条件 三、集群搭建 3.1 下载并解压 3.2 配置环境变量 3.3 集群配置 3.4 HDFS客户端配置 3.5 安装包分发 四、启动集群 4.1 启动ZooKeeper集群 4.2 启动Hadoop集群 4.3 启动HBase集群 4.5 查看服务 一、集群规划 这里搭建一个 3 节点的 HBase 集群,其中三台主机上均为 Regin Server 。同时为了保证高可用,除了在 hadoop001 上部署主 Master 服务外,还在 hadoop002 上部署备用的 Master 服务。Master 服务由 Zookeeper 集群进行协调管理,如果主 Master 不可用,则备用 Master 会成为新的主 Master 。 二、前置条件 HBase 的运行需要依赖 Hadoop 和 JDK( HBase 2.0+ 对应 JDK 1.8+ ) 。同时为了保证高可用,这里我们不采用 HBase 内置的 Zookeeper 服务,而采用外置的 Zookeeper 集群。相关搭建步骤可以参阅: Linux 环境下 JDK 安装 Zookeeper 单机环境和集群环境搭建 Hadoop 集群环境搭建 三、集群搭建 3.1 下载并解压 下载并解压,这里我下载的是 CDH 版本 HBase,下载地址为:http://archive