hbase

HBase基本介绍

别说谁变了你拦得住时间么 提交于 2019-12-10 19:33:45
1HBase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 HBase的发展历程 HBase的原型是Google的BigTable论文,受到了该论文思想的启发,目前作为Hadoop的子项目来开发维护,用于支持结构化的数据存储。 官方网站:http://hbase.apache.org 2006年Google发表BigTable白皮书 2006年开始开发HBase 2008 HBase成为了

HBase: 基本介绍

点点圈 提交于 2019-12-10 19:17:31
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- HBase的发展历程 HBase的原型是Google的BigTable论文,受到了该论文思想的启发,目前作为Hadoop的子项目来开发维护,用于支持结构化的数据存储。 官方网站:http://hbase.apache.org 2006年Google发表BigTable白皮书 2006年开始开发HBase 2008 HBase成为了 Hadoop的子项目

why hbase KeyValueSortReducer need to sort all KeyValue

Deadly 提交于 2019-12-10 18:44:43
问题 I am learning Phoenix CSV Bulk Load recently and I found that the source code of org.apache.phoenix.mapreduce.CsvToKeyValueReducer will cause OOM ( java heap out of memory ) when columns are large in one row (In my case, 44 columns in one row and the avg size of one row is 4KB). What's more, this class is similar with the hbase bulk load reducer class - KeyValueSortReducer . It means that OOM may happen when using KeyValueSortReducer in my case. So, I have a question of KeyValueSortReducer -

Is it better to send data to hbase via one stream or via several servers concurrently?

可紊 提交于 2019-12-10 18:43:51
问题 I'm sorry if this question is basic(I'm new to nosql). Basically I have a large mathimatical process that I'm splitting up and having different servers process and send the result to an hbase database. Each server computing the data, is an hbase regional server, and has thrift on it. I was thinking of each server processing the data and then updating hbase locally(via thrift). I'm not sure if this is the best approach because I don't fully understand how the master(named) node will handle the

java.lang.NoClassDefFoundError with HBase Scan

被刻印的时光 ゝ 提交于 2019-12-10 18:29:47
问题 I am trying to run a MapReduce job to scan a HBase table. Currently I am using the version 0.94.6 of HBase that comes with Cloudera 4.4. At some point in my program I use Scan(), and I properly import it with: import org.apache.hadoop.hbase.client.Scan; It compiles well and I am able to create a jar file too. I do it by passing the hbase classpath as the value for the -cp option. When running the program, I obtain the following message: Exception in thread "main" java.lang

Springboot集成Phoenix+Hbase+MybatisPlus

南笙酒味 提交于 2019-12-10 18:29:00
Springboot集成Phoenix+Hbase+MybatisPlus 环境配置 相关配置文件 安装Hbase,集成Phoenix Squirrel客户端连接Phoenix 集成到Springboot+myBatisPlus项目中 Springboot+MybatisPlus查询Hbase中数据 测试 完结 环境配置 Springboot2.2.1.RELEASE JDK1.8 Phoenix5.0.0 Hbase2.0.0 MybatisPlus3.1.0 Squirrel SQL Client数据库连接客户端 Hbase部署在Centos7 本地虚拟机中 hbase-2.0.0-bin.tar.gz 下载地址: https://archive.apache.org/dist/hbase/2.0.0/hbase-2.0.0-bin.tar.gz apache-phoenix-5.0.0-HBase-2.0-bin.tar.gz 下载地址: http://archive.apache.org/dist/phoenix/apache-phoenix-5.0.0-HBase-2.0/bin/apache-phoenix-5.0.0-HBase-2.0-bin.tar.gz Squirrel 客户端工具下载地址: http://sourceforge.net/projects

Hbase exception org/apache/commons/configuration/Configuration not found

孤人 提交于 2019-12-10 18:26:57
问题 I am new to hbase trying to make it work with java . i tried the following code it gives an exception please help. package com.bee.searchlib.test; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.MasterNotRunningException; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable;

Spark RDD find by key

浪子不回头ぞ 提交于 2019-12-10 18:23:36
问题 I have an RDD transformed from HBase: val hbaseRDD: RDD[(String, Array[String])] where the tuple._1 is the rowkey. and the array are the values in HBase. 4929101-ACTIVE, ["4929101","2015-05-20 10:02:44","dummy1","dummy2"] 4929102-ACTIVE, ["4929102","2015-05-20 10:02:44","dummy1","dummy2"] 4929103-ACTIVE, ["4929103","2015-05-20 10:02:44","dummy1","dummy2"] I also have a SchemaRDD (id,date1,col1,col2,col3) transformed to val refDataRDD: RDD[(String, Array[String])] for which I will iterate over

PySpark: Can saveAsNewAPIHadoopDataset() be used as bulk loading to HBase?

拈花ヽ惹草 提交于 2019-12-10 18:20:52
问题 We currently import data to HBase tables via Spark RDDs (pyspark) by using saveAsNewAPIHadoopDataset(). Is this function using the HBase bulk loading feature via mapreduce? In other words, would saveAsNewAPIHadoopDataset(), which imports directly to HBase, be equivalent to using saveAsNewAPIHadoopFile() to write Hfiles to HDFS, and then invoke org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles to load to HBase? Here is an example snippet of our HBase loading routine: conf = {"hbase

Copy Data from one hbase table to another

核能气质少年 提交于 2019-12-10 18:17:47
问题 I have created one table hivetest which also create the table in hbase with name of 'hbasetest'. Now I want to copy 'hbasetest' data into another hbase table(say logdata) with the same schema. So, can anyone help me how do copy the data from 'hbasetest' to 'logdata' without using the hive. CREATE TABLE hivetest(cookie string, timespent string, pageviews string, visit string, logdate string) STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler' WITH SERDEPROPERTIES ("hbase.columns