文件名称:
Hypertable Architecture
开发工具:
文件大小: 699kb
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上传时间: 2019-07-02
详细说明：Hypertable is a massively scalable database modeled after Google's Bigtable database. Bigtable is part of a group of scalable computing technologies developed by Google which is depicted in the following diagram.Like a relational database, Hypertable represents data as tables of information
Each row in a table has cells containing related information, and each cell is
identified, in part, by a row key and column name. Support for up to 255 column
names is provided when the table is created. Hypertable provides two additiona
features
column qualifier- The column names defined in the table schema are
referred to as column families. Applications may supply an optional column
qualifier, with each distinct qualifier representing a qualified column instance
belonging to the column family. The application can define an unlimited
number of qualified instances of a column family. The application supplied
column name has the format family: qualifier, and column data is stored in a
sparse format such that one row may have millions of qualified instances of a
column family, while another row may have none or just a few instances
timestamp- This is a 64-bit field associated with each cell that allows for
different cell versions. The value represents nanoseconds since the Unix epoch
and can be supplied by the application or auto-assigned by the server. The number of
versions stored can be configured in the table schema and the number of versions returned
can be specified in the query predicate. The versions are stored in reverse-chronological
order. so that the newest version of the cell is returned first
The following diagram illustrates how data is represented in Hypertable. The table is an example
taken from a web crawler that stores information for each page that it crawls in a row of the table
crawldb Table
title
content
anchor
row key
i anchor: cum. apple WwW
anchor: curmI redherring. WWw
com. facebook WWw Facebook I Home
anchor: org. slashdot www
com.zvcnts.wwwdiscaverThingsTochead>
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