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https://issues.apache.org/jira/browse/CASSANDRA-11875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15302250#comment-15302250
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Kaide Mu commented on CASSANDRA-11875:
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A WIP Patch has been attached, it includes:
- ColumnFamilyStore.getSSTablePath(File directory, String version) which allows
create a SSTable according version specified for example by Downgrader.
- Downgrader and StandaloneDowngrader based on upgrader and StandaloneDowngrader
- OperationType.DOWNGRADE_SSTABLE
Tested the work-flow with SSTableWriterTest creating a SSTable of version "ma"
by specifying it on getWriter of SSTableWriterTestBase. Need to test the same
work-flow using StandaloneDowngrader.
> Create StandaloneDowngrader with support to ma format
> -----------------------------------------------------
>
> Key: CASSANDRA-11875
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11875
> Project: Cassandra
> Issue Type: Sub-task
> Components: Tools
> Reporter: Paulo Motta
> Assignee: Kaide Mu
> Priority: Minor
> Attachments: trunk-11875-WIP-V1.patch
>
>
> Currently {{Upgrader}} receives an sstable in any readable format, and writes
> into {{BigFormat.getLatestVersion()}}. We should generalize it by making it
> receive a {{target}} version and probably also rename it to
> {{SSTableConverter}}.
> Based on this we can create an {{StandaloneDowngrader}} tool which will
> perform downgrade of specified sstables to a target version. To start with,
> we should support only downgrading to {{ma}} format (from current format
> {{mb}}), downgrade to any other version should be forbidden. Since we already
> support serializing to "ma" we will not need to do any data conversion.
> We should also create a test suite that creates an sstable with data in the
> current format, perform the downgrade, and verify data in the new format is
> correct. This will be the base tests suite for more advanced conversions in
> the future.
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