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https://issues.apache.org/jira/browse/PHOENIX-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699720#comment-16699720
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ASF GitHub Bot commented on PHOENIX-4765:
-----------------------------------------
Github user ChinmaySKulkarni commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/406#discussion_r236472049
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java
---
@@ -530,6 +530,10 @@ private static PName newPName(byte[] keyBuffer, int
keyOffset, int keyLength) {
private int maxIndexesPerTable;
private boolean isTablesMappingEnabled;
+ // this flag denotes that we will continue to write parent table
column metadata while creating
+ // a child view and also block metadata changes that were previously
propagated to children
+ // before 4.15, so that we can rollback the upgrade to 4.15 if required
+ private boolean allowSystemCatalogRollback;
--- End diff --
Had a conversation offline with Thomas and the underlying point in my
comment above is already being addressed. Thanks @twdsilva.
> Add client and server side config property to enable rollback of splittable
> System Catalog if required
> ------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-4765
> URL: https://issues.apache.org/jira/browse/PHOENIX-4765
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Thomas D'Silva
> Assignee: Thomas D'Silva
> Priority: Blocker
> Attachments: PHOENIX-4765-v2-4.x-HBase-1.3.patch,
> PHOENIX-4765-v2.patch
>
>
> After the server has been upgraded we will have a client and server side
> config property that will allow us to rollback the upgrade if required. This
> config will:
> 1. Continue storing parent column metadata along with a child view
> 2. Disallow metadata changes to a base table that require being propagated to
> child views.
> 3. Prevent SYSTEM.CATALOG from splitting.
> If the client is older than the server we also disallow metadata changes to a
> base table with child views since we no longer lock the parent on the server
> side. This is handled on the client side as part of PHOENIX-3534.
>
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