hbase

HBase>HBase底层原理

由 末鹿安然 提交于 2019-12-12 23:40:42
文章目录 系统架构 HBase的表数据模型 Row Key 列族Column Family 列 Column 时间戳 Cell VersionNum 物理存储 1、整体结构 2、STORE FILE & HFILE结构 3、Memstore与storefile 4、HLog(WAL log) 读写过程 1、读请求过程： 2、写请求过程： Region管理 Master工作机制 系统架构 Client 1 包含访问hbase的接口， client维护着一些cache来加快对hbase的访问 ，比如regione的位置信息。 Zookeeper 1 保证任何时候，集群中只有一个master 2 存贮所有Region的寻址入口 3 实时监控Region Server的状态，将Region server的上线和下线信息实时通知给Master 4 存储Hbase的schema,包括有哪些table，每个table有哪些column family Master职责 1 为Region server分配region 2 负责region server的负载均衡 3 发现失效的region server并重新分配其上的region 4 HDFS上的垃圾文件回收 5 处理schema更新请求 Region Server职责 1 Region server 维护Master分配给它的region

Image/Video on HBASE and made available via some sort of Http URL for access

由 二次信任 提交于 2019-12-12 23:12:49
问题 I want to store some videos[binary] files on HBase,and made available via some sort of Http URL for access. Can someone help me with the architecture/design for such uses cases. I have seen below links, mostly referring to HDFS; Is HDFS better for this kind of usecase as compared to HBase? https://www.quora.com/Is-hadoop-HDFS-a-type-of-system-you-use-to-store-videos-for-your-internet-application Store images/videos into Hadoop HDFS Accessing video stored in HDFS over http 来源： https:/

HBase基本介绍

由 北城以北 提交于 2019-12-12 23:00:43
文章目录 简介 2、HBase与Hadoop的关系 3、RDBMS与HBase的对比 4、HBase特征简要 5、HBase的基础架构 组件： 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。 2、HBase与Hadoop的关系 1、HDFS 为分布式存储提供文件系统 针对存储大尺寸的文件进行优化，不适用对HDFS上的文件进行随机读写 直接使用文件 数据模型不灵活 使用文件系统和处理框架 优化一次写入，多次读取的方式 2、HBase

Is there a way in HBase to COUNT rows matching rowkey-search

由 南楼画角 提交于 2019-12-12 19:11:37
问题 Let's say my Rowkey has two parts (NUM1~NUM2). I would like to do a count group by the first part of the Rowkey. Is there a way to do this in HBase? I can always do it as a M/R job read all the rows, group, count...but I was wondering if there is a way to do it in HBase? 回答1: Option 1 : you can use prefix filter.... some thing like below. prefixfilter: This filter takes one argument a prefix of a row key. It returns only those key-values present in a row that starts with the specified row

How connect to Hortonworks sandbox Hbase using Java Client API

由 Deadly 提交于 2019-12-12 18:53:10
问题 I have setup fresh Hortonworks sandbox .I'm trying to connect Hbase using Java Client API.This is the code i tried so far.But did not success.I did not change any configuration on Wortonworks sandbox.Do i need to do any configuration part in Hbase ? Configuration configuration = HBaseConfiguration.create(); configuration.set("hbase.zookeeper.property.clientPort", "2181"); configuration.set("hbase.zookeeper.quorum", "127.0.0.1"); configuration.set("hbase.master", "127.0.0.1:600000");

Why Namenode is not working in Hadoop given setup

由 ぐ巨炮叔叔 提交于 2019-12-12 16:37:09
问题 I want to establish HBase cluster of 2 nodes. For that I first establish Hadoop setup. It works fine. Namenode, Secondary namenode, datanode, Jobtracker, Tasktracker, all are working, but when I configure for Hbase, Namenode stucks. It does not work now. Can you tell me why this happening? My questions When hadoop is working, and over that when I configure Hbase. It only shows one machine available. But it have to show two machine available, on http://hdmaster:60010/master-status . When I

Spark 2.3.0 SQL unable insert data into hive hbase table

由 一曲冷凌霜 提交于 2019-12-12 16:27:47
问题 Use Spark 2.3 thriftserver integrated with hive 2.2.0. running from spark beeline. Try to insert data into hive hbase table (a hive table with hbase as storage). Insert into hive native table is ok. When inserting into hive hbase table, it throws the following exception: ClassCastException: org.apache.hadoop.hive.hbase.HiveHBaseTableOutputFormat cannot be cast to org.apache.hadoop.hive.ql.io.HiveOutputFormat at org.apache.spark.scheduler.Task.run(Task.scala:109) at org.apache.spark.executor

HBase Shell hangs / freezes

由 喜夏-厌秋 提交于 2019-12-12 16:05:23
问题 I've installed HBase 0.92.1-cdh4.0.1 on Ubuntu 12.04 in Pseudo-Distributed mode. hbase-master , hbase-regionserver and zookeeper-server are running on this machine; the HDFS is running on another machine (property hbase.rootdir set accordingly). Now I have a problem with the "hbase shell": whenever I submit a create table statement like create 'tbl1', {NAME => 'd', COMPRESSION => 'GZ'} the shell hangs (it does not return anything; waits forever) and I have to kill it with ctrl+c. However the

Bigtable error with sbt assembly fat JAR (Neither Jetty ALPN nor OpenSSL are available)

由 你说的曾经没有我的故事 提交于 2019-12-12 15:13:10
问题 I would like to build a Restful API with akka-http able to retrieve data from Bigtable (HBase). The Bigtable client API requires netty-tcnative-boringssl-static to connect. This works pretty well inside my Intellij IDE, but when I build a fat JAR with sbt-assembly, and then run the server, I get the following error: 2017-01-10 12:03:41 ERROR BigtableSession:129 - Neither Jetty ALPN nor OpenSSL are available. OpenSSL unavailability cause: java.lang.IllegalArgumentException: Failed to load any

HBase multi columns filtering

由 北城以北 提交于 2019-12-12 14:23:43
问题 I have a table with multiple columns in HBase. The structure of the table is something like this: row1 column=cf:c1, timestamp=xxxxxx, value=v1 row1 column=cf:c2, timestamp=xxxxxx, value=v2 row1 column=cf:c3, timestamp=xxxxxx, value=v3 ... I want to write a custom filter which can filter the value in a certain column. For example, if the value v3 in the column c3 exists, I want to include the whole row, otherwise drop it. As far as I understand, the HBase filter is based on the cell , which
订阅 hbase