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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4605) Constraints
Date Tue, 20 Dec 2011 07:17:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172993#comment-13172993

jiraposter@reviews.apache.org commented on HBASE-4605:

bq.  On 2011-12-20 00:20:28, Ted Yu wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/constraint/Constraints.java, line 278
bq.  > <https://reviews.apache.org/r/2579/diff/8/?file=64473#file64473line278>
bq.  >
bq.  >     I wish we had brought up this argument to Gary earlier.
bq.  Gary Helmling wrote:
bq.      I don't see how stuffing binary data into the HTD values (which is what I argued
against) is any less polluting HTD?  I think the options here are:
bq.      1) store in HTD, in which case I think the current string representation is better
than what we had before with the Guava dependencies
bq.      2) store configuration for Constraints to the side, in which case ConstraintProcessor
can handle mapping configuration to the Contraint instances however it wants.
bq.  Jesse Yates wrote:
bq.      What do you mean by "to the side"? Ted mentions a centralized repo in HBASE-5070.
Are you thinking of essentially a system-level table for just this stuff - kind of an aux-meta
table that can be used to store just arbitrary data? 
bq.      On one hand cool, on the other, but big are the confs really going to be in the HTD?
Probably not more than a couple lines, and you may or may not want to see it, but at the very
least you will always get it, as opposed to worrying about another moving part, that may or
may not be there "on the side".

Adding conf as String to HTD is for sure convenient.  Just wondering what it'll look like
when we describe a table.  What happens when we want to alter a table?   Maybe this a non-issue/just
aesthetics.  Have you tried it?

- Michael

This is an automatically generated e-mail. To reply, visit:

On 2011-12-13 21:38:03, Jesse Yates wrote:
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/2579/
bq.  -----------------------------------------------------------
bq.  (Updated 2011-12-13 21:38:03)
bq.  Review request for hbase.
bq.  Summary
bq.  -------
bq.  Most of the implementation for adding constraints as a coprocessor. 
bq.  Looking for general comments on style/structure, though nitpicks are ok too. 
bq.  Currently missing implementation for disableConstraints() since that will require adding
removeCoprocessor() to HTD (also comments on if this is worth it would be good). 
bq.  This addresses bug HBASE-4605.
bq.      https://issues.apache.org/jira/browse/HBASE-4605
bq.  Diffs
bq.  -----
bq.    src/docbkx/book.xml 9617950 
bq.    src/main/java/org/apache/hadoop/hbase/HTableDescriptor.java 84a0d1a 
bq.    src/main/java/org/apache/hadoop/hbase/constraint/BaseConstraint.java PRE-CREATION 
bq.    src/main/java/org/apache/hadoop/hbase/constraint/Constraint.java PRE-CREATION 
bq.    src/main/java/org/apache/hadoop/hbase/constraint/ConstraintException.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/constraint/ConstraintProcessor.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/constraint/Constraints.java PRE-CREATION 
bq.    src/main/java/org/apache/hadoop/hbase/constraint/package-info.java PRE-CREATION 
bq.    src/test/java/org/apache/hadoop/hbase/TestHTableDescriptor.java PRE-CREATION 
bq.    src/test/java/org/apache/hadoop/hbase/constraint/AllFailConstraint.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/constraint/AllPassConstraint.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/constraint/CheckConfigurationConstraint.java
bq.    src/test/java/org/apache/hadoop/hbase/constraint/RuntimeFailConstraint.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/constraint/TestConstraint.java PRE-CREATION 
bq.    src/test/java/org/apache/hadoop/hbase/constraint/TestConstraints.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/constraint/WorksConstraint.java PRE-CREATION

bq.  Diff: https://reviews.apache.org/r/2579/diff
bq.  Testing
bq.  -------
bq.  Adding IntegrationTestConstraint and unit tests for Constraints and IntegerConstraint.
All of those pass.
bq.  Thanks,
bq.  Jesse

> Constraints
> -----------
>                 Key: HBASE-4605
>                 URL: https://issues.apache.org/jira/browse/HBASE-4605
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, coprocessors
>    Affects Versions: 0.94.0
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>         Attachments: 4605-v6.txt, 4605.v7, constraint_as_cp.txt, java_Constraint_v2.patch,
java_HBASE-4605_v1.patch, java_HBASE-4605_v2.patch, java_HBASE-4605_v3.patch, java_HBASE-4605_v5.patch,
> From Jesse's comment on dev:
> {quote}
> What I would like to propose is a simple interface that people can use to implement a
'constraint' (matching the classic database definition). This would help ease of adoption
by helping HBase more easily check that box, help minimize code duplication across organizations,
and lead to easier adoption.
> Essentially, people would implement a 'Constraint' interface for checking keys before
they are put into a table. Puts that are valid get written to the table, but if not people
can will throw an exception that gets propagated back to the client explaining why the put
was invalid.
> Constraints would be set on a per-table basis and the user would be expected to ensure
the jars containing the constraint are present on the machines serving that table.
> Yes, people could roll their own mechanism for doing this via coprocessors each time,
but this would make it easier to do so, so you only have to implement a very minimal interface
and not worry about the specifics.
> {quote}

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