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https://issues.apache.org/jira/browse/HBASE-23678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17073636#comment-17073636
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Hudson commented on HBASE-23678:
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Results for branch branch-1
[build #1277 on
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/branch-1/1277/]:
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> Literate builder API for version management in schema
> -----------------------------------------------------
>
> Key: HBASE-23678
> URL: https://issues.apache.org/jira/browse/HBASE-23678
> Project: HBase
> Issue Type: Improvement
> Reporter: Andrew Kyle Purtell
> Assignee: Viraj Jasani
> Priority: Major
> Fix For: 3.0.0, 2.3.0, 1.7.0, 2.4.0
>
>
> Lars designed the combination of VERSIONS, TTL, MIN_VERSIONS, and
> KEEP_DELETED_CELLS with a maximum of flexibility. There is a lot of nuance
> regarding their usage. Almost all combinations of these four settings make
> sense for some use cases (exceptions are MIN_VERSIONS > 0 without TTL, and
> KEEP_DELETED_CELLS=TTL without TTL). There should be a way to make the
> behavior with TTL easier to conceive when creating the schema. This could
> take the form of a literate builder API for ColumnDescriptor or an extension
> to an existing one.
> Let me give you a motivating example: We may want to retain all versions for
> a given TTL, and then only a specific number of versions after that interval
> elapses. This can be achieved with VERSIONS=INT_MAX,
> TTL=_retention_interval_, KEEP_DELETED_CELLS=TTL, MIN_VERSIONS=_num_versions_
> . This is not intuitive though because VERSIONS has been used to specify the
> number of versions to retain (_num_versions_ in this example) since HBase
> version 0.1, so this is going to be a source of confusion - I've seen it in
> practice.
> A literate builder API, by way of the way we design its method names, could
> let a user describe more or less in speaking language how they want version
> retention to work, and internally the builder API could set the low level
> schema attributes.
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