hbase architecture

Reprinted: http://blog.csdn.net/hxpjava1/article/details/20043703 Environment:Hadoop: hadoop-2.2.0Hbase: hbase-0.96.0.1.org. Apache. hadoop. hbase. Client. Put0.94.6 public class put extends mutation implements heapsize, writable, comparable 0.96.0 public class put extends mutation implements heapsize, comparable Solution:By public class monthuserlogintimeindexreducer extends reducer Change public class mon

What is hbase? Hbase is a sub-project in Apache hadoop. hbase relies on hadoop's HDFS as the basic storage unit. By using hadoop's DFS tool, you can see the structure of these data storage folders, you can also use the MAP/reduce framework (Algorithm) Perform operations on hbase, as shown in the figure on the right:Hb

I started zookeeper after the start of HDFs, the last time to start hbase, found that the JPS process does not show the hmaster process, as follows: [hadoop@hadoop000 bin]$ JPS 3936 NameNode 4241 secondarynamenode 6561 JPS 4041 DataNode 3418 Quorumpeermain Then./hbase shell, found the following error: This is my previous Hbase-site.xml configuration file: In

The following error messages are executed 2016-12-09 19:38:17,672 ERROR [main] client. Connectionmanager$hconnectionimplementation:the Node/hbase is not in ZooKeeper. It should has been written by the master. Check the value configured in ' Zookeeper.znode.parent '. There could is a mismatch with the one configured in the master. 2016-12-09 19:38:17,779 ERROR [main] client. Connectionmanager$hconnectionimplementation:the Node/

The problem is described in detail below:2016-12-09 15:10:39,160 ERROR [org.apache.hadoop.hbase.client.connectionmanager$hconnectionimplementation]- The node/hbase is not in ZooKeeper. It should has been written by the master. Check the value configured in ' Zookeeper.znode.parent '. There could is a mismatch with the one configured in the master.2016-12-09 15:10:39,264 ERROR [Org.apache.hadoop.hbase.client.connectionmanager$hconnectionimplementation

[email protected] conf]$ cat RegionserversHadoopmasterHadoopSlave1HadoopSlave2Export java_home=/home/hadoop/app/jdk1.7.0_79Export Hbase_manages_zk=falseHBase (main):002:0> create ' test_table ', ' F 'Package zhouls.bigdata.HbaseProject.Test1;Import org.apache.hadoop.conf.Configuration;Import org.apache.hadoop.hbase.HBaseConfiguration;Import Org.apache.hadoop.hbase.TableName;Import org.apache.hadoop.hbase.client.HTable;Import Org.apache.hadoop.hbase.client.Put;Import org.apache.hadoop.hbase.util.

how hbase is accessed1. Native Java API: The most conventional and efficient way to access;2, hbase shell:hbase command line tool, the simplest interface, suitable for hbase management use;3, Thrift Gateway: The use of Thrift serialization technology, support C++,php,python and other languages, suitable for other heterogeneous systems online access

, which takes a relatively small amount of time. This gossip-based architecture brings the following benefits to users: first, the system management is extremely simple. For example, to add a new node, the node will communicate with the seed node to complete the bootstrapping process and prepare data and route information. In addition, this P2P architecture provides good performance and availability. The lo

HBase version: 0.98.6Thrift Version: 0.9.0Use thrift client with Python to connect HBase error:1 Traceback (most recent):2File"D:\workspace\Python\py\helloworld.py", line 27,inch3tables =client.gettablenames ()4File"E:\mazhongsoft\python\lib\hbase\Hbase.py", line 788,inchGettablenames5 returnself.recv_gettablenames ()6File"E:\mazhongsoft\python\lib\

distributed to other region servers for recovery. The Hlog file is an ordinary Hadoop Sequence file,sequence The key is the Hlogkey object, the Hlogkey records the attribution information written to the data, in addition to table and region names, but also includes Sequence number and Timestamp,timestamp are "write Time", the starting value of sequence is 0, or the last time the file system was deposited in sequence. The value of HLog sequece file is the KeyValue object of

through the DFS client and the Distributed File System HDFS for interaction. 2. Client Data Access process: Before the client accesses user data, it needs to first access zookeeper, then access-root-table, and then access. meta. table, and finally the user data can be accessed. network operations need to be performed multiple times in the middle, but the client will cache the data. -Root-Where are tables and. Meta stored ?? When the client accesses data on

BKJIA: You may have seen this message in some places. Facebook has developed a new social inbox, integrates email, instant messaging, text messages, text information, and Facebook site information. Most importantly, they need to store 135 billion pieces of information each month. Where do they store this information? Facebook's Kannan Muthukkaruppan provides an amazing answer in "technology behind information": HBase.

. The Value of HLog Sequece File is the KeyValue object of HBase, which corresponds to the KeyValue in HFile. See the preceding description. Iv. System Architecture Client 1 contains the interface for accessing hbase. The client maintains some caches to speed up access to hbase, such as the location information of r

Data import./hbase org.apache.hadoop.hbase.mapreduce.Driver Import table name data file locationHdfsThe data file location can be prefixed file:///Otherwise, the HDFs address is accessed.Data export./hbase org.apache.hadoop.hbase.mapreduce.Driver Export table name data file locationEnter the shell command.cd/hbasehome/bin/CD./hbase Shell2016-05-20 15:36:32,370 IN

Implement Hbase paging and Hbase Paging Author: Source of R xingyue: http://www.cnblogs.com/rxingyue. You are welcome to reprint it. Please keep this statement. Thank you! In a project, hbase paging is performed because the data volume is large and scheduled incremental analysis is required. The version used in the project is hbase1.1. Need to enable coprocessor

1.2. Quick Start-standalone HBase This guide describes setup of a standalone HBase instance running against the local filesystem. This isn't an appropriate configuration for a production instance of HBase, but would allow you to experiment with HBase. This section shows the Create a table in

I. Segmentation and distribution of large tablesThe tables in HBase are made up of rows and columns. Tables in HBase can be up to billions of rows and millions of columns. The size of each table can be up to terabytes, sometimes even petabytes. These tables are split into smaller units of data and then allocated to multiple servers. These smaller data units are called region. The server hosting region is ca

client implementation of the scenario two is the most appropriate solution, and its performance and maintainability, extensibility is relatively good. Distributed Cache system we use REDIS implementations and implement a localcache locally on the client to maximize the cache hit rate and reduce the time lag caused by communication (locality hypothesis, the same client is most likely to access the data it put).0X03 implementationThe overall architecture