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From "Stu Hood (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-3067) Simple SSTable Pluggability
Date Mon, 22 Aug 2011 19:01:28 GMT
Simple SSTable Pluggability

                 Key: CASSANDRA-3067
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
            Reporter: Stu Hood
            Assignee: Stu Hood
             Fix For: 1.0

CASSANDRA-2995 proposes full storage engine pluggability, which is probably unavoidable in
the long run. For now though, I'd like to propose an incremental alternative that preserves
the sstable model, but allows it to evolve non-linearly.

The sstable "version" field could allow for simple switching between writable sstable types,
without moving all the way to differentiating between engines as CASSANDRA-2995 requires.
This can be accomplished by moving towards a "feature flags" model (with a mapping between
versions and feature sets), rather than a linear versions model (where versions can be strictly
ordered and all versions above X have a feature).

There are restrictions on this approach:
* It's sufficient for an alternate SSTable(Writer|Reader|*) set to require a patch to enable
(rather than a JAR)
* Filenames/descriptors/components must conform to the existing conventions

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