hbase | 易学教程

HRegionServer shows “error telling master we are up”. Showing socket exception: Invalid argument

阅读更多关于 HRegionServer shows “error telling master we are up”. Showing socket exception: Invalid argument

问题 Iam trying to create a hbase cluster in 3 centos machines. Hadoop(v - 2.8.0) is up and running on top I configured HBase(v - 1.2.5).Hbase start up is fine it started HMaster and Region servers but still it shows the follwing error in region servers and in HMaster log it shows no region servers are checked in. 2017-04-20 19:30:33,950 WARN [regionserver/localhost/127.0.0.1:16020] regionserver.HRegionServer: error telling master we are up com.google.protobuf.ServiceException: java.net

Not able to connect to HBase from Windows

阅读更多关于 Not able to connect to HBase from Windows

问题 I am trying to run a HBase Java Client Program from Windows. All I have is 1) A Java Program without any compiler error 2) hbase-site.xml (No other HDFS or HBase config files I have. Only the above one.) When I run the program I get the following error-given in the last block. Do I miss something? Both I am giving here. <?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?> <configuration> <property> <name>hbase.zookeeper.quorum</name> <value>IP Address1,IPAddress2

HBase核心知识点总结

阅读更多关于 HBase核心知识点总结

一、HBase介绍 1 、基本概念 HBase是一种Hadoop数据库，经常被描述为一种稀疏的，分布式的，持久化的，多维有序映射，它基于行键、列键和时间戳建立索引，是一个可以随机访问的存储和检索数据的平台。HBase不限制存储的数据的种类，允许动态的、灵活的数据模型，不用SQL语言，也不强调数据之间的关系。HBase被设计成在一个服务器集群上运行，可以相应地横向扩展。 2 、HBase使用场景和成功案例互联网搜索问题：爬虫收集网页，存储到BigTable里，MapReduce计算作业扫描全表生成搜索索引，从BigTable中查询搜索结果，展示给用户。抓取增量数据：例如，抓取监控指标，抓取用户交互数据，遥测技术，定向投放广告等内容服务信息交互 3 、HBase Shell命令行交互：启动Shell $ hbase shell 列出所有的表 hbase > list 创建名为mytable的表，含有一个列族hb hbase > create ' mytable' , 'hb' 在‘mytable’表的'first'行中的‘hb:data’列对应的数据单元中插入字节数组‘hello HBase’ hbase > put 'mytable' , 'first' , 'hb:data' , 'hello HBase' 读取mytable表 ‘first’行的内容 hbase >

Is there a way to deserialize the java object via python

阅读更多关于 Is there a way to deserialize the java object via python

问题 I stored the java object in hbase (i.e) Let's say I have an object 'User' with 3 parameters like firstname, middlename and lastname. I used the following code for serialization in java Object object = (object) user; byte[] byteData = SerializationUtils.serialize((Serializable) object); and stored in hbase like 'storing complete object (in byte[] format of above) in the Value portion of the KeyValue pair' It is stored in hbase like (Example) column=container:container, timestamp=1480016194005,

How to get a column value based on criteria like where clause in Hbase shell

阅读更多关于 How to get a column value based on criteria like where clause in Hbase shell

问题 I am new to Hbase. I have a scenario where I need to pull a filename based on the status and current date. So I have created 3 columns; filename , status and date in the Hbase table. How can I get the filename based on the condition that the status=true and date is today? This query needs to be executed on the Hbase shell. 回答1: Achieving this in a concise way is difficult. But here is what I did. hbase shell is a JRuby shell, which enables us to do the following example. import org.apache

How to get a column value based on criteria like where clause in Hbase shell

阅读更多关于 How to get a column value based on criteria like where clause in Hbase shell

Memory Requirement/Utilization for MongoDB, Riak and HyperTable (or HBase)

阅读更多关于 Memory Requirement/Utilization for MongoDB, Riak and HyperTable (or HBase)

问题 I've evaluated most of the NoSQL solutions and it seems that using a combination of MongoDB, Riak and HyperTable (or HBase) is the way to go. What is the minimum requirement for these databases to run comfortably? Let's say, if I deploy these databases (MongoDB, Riak and HyperTable - or HBase) - and Web Server (such as nginx or Cherokee) and Java/GlassFish - ALL on a single-machine running FreeBSD with 32 GB of RAM, how will they perform? Note that by going with this approach, the entire 32

Row Locking in HBase single row transaction support

阅读更多关于 Row Locking in HBase single row transaction support

问题 In HBase, For providing single row transaction support it uses Row Locking Concept. Suppose, for example Put p=new Put("/*Row Key*/"); This statement will lock the row. so, until we complete the table.put(p) the lock won't gets released. So, in between if i start a new put i.e Put p1=new Put("/ Row Key "); the p1 put should not work since the row has already been locked but in HBase 0.94 when i tried it's working. Regarding Row Lock Link Where i had seen about Row Lock Is there any thing

hbase as database in web application

阅读更多关于 hbase as database in web application

问题 A big question about using hadoop or related technologies in a real web application. I just want to find out how a web app can use hbase as its database. I mean is it the thing the big data apps do or they use normal databases and just use these sort of technologies for analysis? Is it ok to have a online store with Hbase database or something like this? 回答1: Yes it is perfectly fine to have hbase as your backend. What I am doing to get this done,( I have a online community and forum running

How to create Namespace On HBase

阅读更多关于 How to create Namespace On HBase

问题 I have installed HBase on Linux platform Manually and with Cloudera. I can able to create tables on it, but i when am creating a namespace it trowing one error like this on both installations. hbase(main):004:0> create_namespace 'my_ns' NoMethodError: undefined method `create_namespace' for #<Object:0x699dbc28> Hbase Version 0.94.12 Please help me on this. Thanks, 回答1: namespaces isn't available in 0.94 I believe. The major effort on namespaces isn't completed yet. See https://issues.apache