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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9459) SecondaryIndex API redesign
Date Fri, 22 May 2015 15:18:17 GMT
Sam Tunnicliffe created CASSANDRA-9459:
------------------------------------------

             Summary: SecondaryIndex API redesign
                 Key: CASSANDRA-9459
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9459
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Sam Tunnicliffe
            Assignee: Sam Tunnicliffe
             Fix For: 3.0 beta 1


For some time now the index subsystem has been a pain point and in large part this is due
to the way that the APIs and principal classes have grown organically over the years. It would
be a good idea to conduct a wholesale review of the area and see if we can come up with something
a bit more coherent.

A few starting points:
* There's a lot in AbstractPerColumnSecondaryIndex & its subclasses which could be pulled
up into SecondaryIndexSearcher (note that to an extent, this is done in CASSANDRA-8099).
* SecondayIndexManager is overly complex and several of its functions should be simplified/re-examined.
The handling of which columns are indexed and index selection on both the read and write paths
are somewhat dense and unintuitive.
* The SecondaryIndex class hierarchy is rather convoluted and could use some serious rework.

There are a number of outstanding tickets which we should be able to roll into this higher
level one as subtasks (but I'll defer doing that until getting into the details of the redesign):

* CASSANDRA-7771
* CASSANDRA-8103
* CASSANDRA-9041
* CASSANDRA-4458
* CASSANDRA-8505

Whilst they're not hard dependencies, I propose that this be done on top of both CASSANDRA-8099
and CASSANDRA-6717. The former largely because the storage engine changes may facilitate a
friendlier index API, but also because of the changes to SIS mentioned above. As for 6717,
the changes to schema tables there will help facilitate CASSANDRA-7771.




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