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https://issues.apache.org/jira/browse/PHOENIX-5586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224759#comment-17224759
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Viraj Jasani commented on PHOENIX-5586:
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As part of PHOENIX-6125, we have new split policy introduced for SYSTEM.TASK
which for now is just extending DisabledRegionSplitPolicy. Before 4.16 upgrade,
if operator has already manually updated split policy of SYSTEM.TASK, an
exception will be thrown during upgrade to 4.16 which would mandate an operator
intervention by merging SYSTEM.TASK regions into one single region (if multiple
regions were already available before 4.16 upgrade) and also remove split
policy of the table manually.
> Add documentation for Splittable SYSTEM.CATALOG
> -----------------------------------------------
>
> Key: PHOENIX-5586
> URL: https://issues.apache.org/jira/browse/PHOENIX-5586
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 4.15.0, 5.1.0
> Reporter: Chinmay Kulkarni
> Priority: Blocker
> Fix For: 4.15.1, 5.1.1, 4.16.0
>
>
> There are many changes after PHOENIX-3534 especially for backwards
> compatibility. There are additional configurations such as
> "phoenix.allow.system.catalog.rollback" which allows rollback of splittable
> SYSTEM.CATALOG, etc. We should document these changes.
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