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From Steve Berg - GMail <sb.h...@gmail.com>
Subject Re: HBase and Data Integrity
Date Fri, 01 Mar 2013 14:22:01 GMT
Hi,

I'm looking for an example of the constraints in HBase with |void check 
(put p)|, this is indeed possible, but how? Does anyone possible 
examples (code) to?

Ever advance thank you!

best regards!





Am 18.02.2013 01:15, schrieb Andrew Purtell:
> Yes, but implementing a constraint requires implementing a 
> coprocessor, which is not something I'd recommend to users as a 
> general practice. HBase doesn't offer referential integrity as 
> commonly understood in the RDBMS world (foreign keys, etc.) out of the 
> box.
>
>
> On Sat, Feb 16, 2013 at 6:52 PM, Ted Yu <yuzhihong@gmail.com 
> <mailto:yuzhihong@gmail.com>> wrote:
>
>     Some addendum to Benoit's answers.
>     In HBase you can setup Constraint for your table. From javadoc:
>
>      * Apply a {@link Constraint} (in traditional database
>     terminology) to a
>     HTable.
>
>      * Any number of {@link Constraint Constraints} can be added to
>     the table,
>     in
>
>      * any order.
>     See
>     hbase-server/src/main/java/org/apache/hadoop/hbase/constraint/Constraint.java
>
>     Cheers
>
>     On Sat, Feb 16, 2013 at 4:48 PM, tsuna <tsunanet@gmail.com
>     <mailto:tsunanet@gmail.com>> wrote:
>
>     > bcc: asynchbase@
>     >
>     > On Sat, Feb 16, 2013 at 12:28 PM, Steve Berg
>     <sb.hkn9@googlemail.com <mailto:sb.hkn9@googlemail.com>>
>     > wrote:
>     > > I have some questions for HBase DB:
>     >
>     > Hi Steve,
>     > I'm moving this thread to the HBase user mailing list.
>     >
>     > > How to ensure data integrity?
>     >
>     > Data stored by HBase in HDFS has 3 replicas of the data and
>     checksums.
>     >
>     > > Are there methods ensure the integrity?
>     >
>     > It's all built-in, I'm not sure what you meant by "methods" here.
>     >
>     > > Does HBase primary key? or alternatives
>     >
>     > HBase has only one primary key per table.
>     > You may wanna look at the HBase Book, Chapter 5. "Data Model":
>     > http://hbase.apache.org/book.html#datamodel
>     >
>     > > Foreign key?
>     >
>     > No.
>     >
>     > > Referential Integrity?
>     >
>     > No.
>     >
>     > > How are the ACID properties to be implemented?
>     >
>     > http://hbase.apache.org/acid-semantics.html
>     >
>     > --
>     > Benoit "tsuna" Sigoure
>     >
>
>
>
>
> -- 
> Best regards,
>
>    - Andy
>
> Problems worthy of attack prove their worth by hitting back. - Piet 
> Hein (via Tom White)


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