Changes between Version 2 and Version 3 of phenix


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Timestamp:
02/21/2013 10:52:08 AM (13 years ago)
Author:
liaojiaohe
Comment:

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  • phenix

    v2 v3  
    2727建表的时候会在每条row的第一个columnfamily字段增加一个空的column ,命名为_0,说是为了提高性能[[BR]] 
    2828 
     29{{{ 
     30At create time, an empty key value is added to the first column family of any existing rows. Upserts will also add this empty key value. This is done to improve query performance by having a key value column we can guarantee always being there (minimizing the amount of data that must be projected). Alternately, if a view is created, the HBase table and column families must already exist. No empty key value is added to existing rows and no data mutations are allowed - the view is read-only. Query performance for a view will not be as good as performance for a table. For a table only, HBase table and column configuration options may be passed through as key/value pairs to setup the HBase table as needed. 
     31}}} 
     32 
    2933因为对现有的表有入侵，现在测试环境试一下，以免搞坏生产环境的表[[BR]] 
    3034