hbase

Using Solr to Query HBase

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-11 04:38:52
问题 I have a data warehousing problem, needing to query over a large dataset. For the sake of this example lets say a typical state would have 30 million users with activity stats for each. Ideally I could buy a data warehousing tool (Vertica, Infobright, etc...) but that's not in the cards or the budget. Right now I'm considering using Solr to query HBase. While I believe HBase could scale up to the needs, I worry about Solr. It's optimized as a search engine, i.e. the first pages of results

Read Data from HBase

由 允我心安 提交于 2019-12-11 04:23:42
问题 I'm new to HBase, what's the best way to retrieve results from a table, row by row? I would like to read the entire data in the table. My table has two column families say col1 and col2. 回答1: From Hbase shell, you can use scan command to list data in table, or get to retrieve a record. Reference here 回答2: I think here is what you need: both through HBase shell and Java API: http://cook.coredump.me/post/19672191046/hbase-client-example However you should understand hbase shell 'scan' is very

Unable to connect to HBase stand alone server from windows remote client

由 我只是一个虾纸丫 提交于 2019-12-11 03:57:49
问题 I have my HBase standalone server on centos virtual machine, and my client is on windows desktop. Can I connect to the HBase standalone server remotely without installing HBase on windows ? If yes , Here are the following files /etc/hosts file 172.16.108.1 CentOS60-64 # Added by NetworkManager 127.0.0.1 localhost.localdomain localhost 172.29.36.32 localhost.localdomain localhost 172.29.36.32 534CentOS64-0 hbase-site.xml file <configuration> <property> <name>hbase.rootdir</name> <value>file://

HBase not starting in standalone mode on Windows

由 冷暖自知 提交于 2019-12-11 03:51:08
问题 I downloaded HBase 1.0.1 on my Windows machine and wasn't able to get it to start. I got the following error message: C:\Users\admin\Downloads\hbase-1.0.1>bin\start-hbase.cmd Error: Could not find or load main class " " ERROR: Could not determine the startup mode. What's the problem here? 回答1: There's a problem in how it is forming the java arguments, specific to the memory options. Work-around: Find the following line in hbase.cmd and REMOVE %HEAP_SETTINGS% . set java_arguments=%HBASE_OPTS%

0403-Sqoop笔记

由 喜夏-厌秋 提交于 2019-12-11 03:44:26
0403-Sqoop笔记 第一章 Sqoop简介 第二章 Sqoop原理 第三章 Sqoop安装 3.1 下载解压 3.2 修改配置文件 sqoop-env.sh 3.3 拷贝JDBC驱动 3.4 验证Sqoop 3.5 测试Sqoop是否能够成功连接数据库 第四章 Sqoop简单实用案例 4.1 导入数据(RDBMS -> HDFS/HIVE/HBASE) 4.1.1 RDBMS 到 HDFS 4.1.2 RDBMS 到 HIVE 4.1.3 RDBMS 到 HBASE 4.2 导出数据(HDFS/HIVE/HBASE -> RDBMS) 4.2.1 HIVE/HDFS 到 RDBMS 4.3 脚本打包 第一章 Sqoop简介 主要用于在Hadoop(Hive)与传统的数据库(mysql、postgresql…)间进行数据的传递，可以将一个关系型数据库（例如 ： MySQL ,Oracle ,Postgres等）中的数据导进到Hadoop的HDFS中，也可以将HDFS的数据导进到关系型数据库中。 第二章 Sqoop原理 将导入或导出命令 翻译成mapreduce程序 来实现。 在翻译出的mapreduce中主要是对inputformat和outputformat进行定制。 第三章 Sqoop安装 3.1 下载解压 3.2 修改配置文件 sqoop-env.sh export

HBase REST API Locking Rows

由 谁都会走 提交于 2019-12-11 03:33:41
问题 I am using HBase REST API from C#. I want to implement the Locking [rowlock in HBase Java API] While retrieving the rows using REST API from C#. Help me on this issue.... 回答1: First the row locking has been deprecated in 0.94 and will be removed in trunk soon, so you might not want to rely on it. Secondly I don't think that REST server has a row locking api (see here for the resources available). Docs for the Rest server are located here If you want to implement locks you can use check and

when reversing a Scan in HBase, which is the startKey and which is the stopKey?

由 橙三吉。 提交于 2019-12-11 03:25:14
问题 I'm using HBase 0.98 which allows scans in reverse order. Here is my code: scan = new Scan(eventTimeKey, nowKey); scan.setCaching(1); // setting this to 1 since I only want the first result scan.setMaxResultSize(1L); scan.addColumn(dataBytes, readingBytes); scan.setReversed(true); try { scanner = getTable().getScanner(scan); result = scanner.next(); } finally { if (scanner != null) scanner.close(); } if (result != null && valueIsZero(result)) return true; My question is, what order should the

Dependency conflict in integrating with Cloudera Hbase 1.0.0

由 折月煮酒 提交于 2019-12-11 03:02:53
问题 I tried to connect my play framework (2.4.2) web application to a cloudera hbase cluster. I included hbase dependencies in my bulid.sbt file and used hbase sample code to insert a cell into a table. However, I got this exception which seems to be dependency conflict between play framework and Hbase. I also attached my sample code and build.sbt files as well. I would be grateful for your help to resolve this error. [ERROR] [07/21/2015 12:03:05.919] [application-akka.actor.default-dispatcher-5]

How to query HBase data using MapReduce?

由 删除回忆录丶 提交于 2019-12-11 02:56:41
问题 Hi I am new to MapReduce and HBase. Please guide. I am moving tabular data to HBase using MapReduce. Now data is reached in HBase (so in HDFS). I have created mapreduce job which will read tabular data from file and put it into Hbase using HBase APIs. Now my doubt is can I query HBase data using MapReduce? I dont want to execute HBase commands to query data. Is is possible to query data of HBase using MapReduce? Please help or advice. 回答1: Of course you can, HBase comes with a

大数据常用技术栈

由 谁说我不能喝 提交于 2019-12-11 02:50:32
提起大数据，不得不提由IBM提出的关于大数据的5V特点：Volume（大量）、Velocity（高速）、Variety（多样）、Value（低价值密度）、Veracity（真实性），而对于大数据领域的从业人员的日常工作也与这5V密切相关。大数据技术在过去的几十年中取得非常迅速的发展，尤以Hadoop和Spark最为突出，已构建起庞大的技术生态体系圈。 首先通过一张图来了解一下目前大数据领域常用的一些技术，当然大数据发展至今所涉及技术远不止这些。 BigData Stack： 下面分不同层介绍各个技术，当然各个层并不是字面意义上的严格划分，如Hive既提供数据处理功能也提供数据存储功能，但此处将其划为数据分析层中 1. 数据采集和传输层 Flume Flume一个分布式、可靠的、高可用的用于数据采集、聚合和传输的系统。常用于日志采集系统中，支持定制各类数据发送方用于收集数据、通过自定义拦截器对数据进行简单的预处理并传输到各种数据接收方如HDFS、HBase、Kafka中。之前由Cloudera开发，后纳入Apache Logstash ELK工作栈的一员，也常用于数据采集，是开源的服务器端数据处理管道 Sqoop Sqoop主要通过一组命令进行数据导入导出的工具，底层引擎依赖于MapReduce，主要用于Hadoop（如HDFS、Hive、HBase）和RDBMS（如mysql
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