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https://issues.apache.org/jira/browse/PHOENIX-6186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227066#comment-17227066
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ASF GitHub Bot commented on PHOENIX-6186:
-----------------------------------------

gjacoby126 commented on pull request #935:
URL: https://github.com/apache/phoenix/pull/935#issuecomment-722692891


   @ChinmaySKulkarni - After fixing the test failure in UpgradeIT, we got 
another test run.  It looks like in this latest run the minicluster got into a 
bad state where tables couldn't be created, and this led to a bunch of 
failures. I've rerun them all locally and they look fine. 
   
   As far as I know, this patch should be ready to go for 4.x branch. Anything 
else that needs to be changed or added? Thanks!


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> Store table metadata last modified timestamp in PTable / System.Catalog
> -----------------------------------------------------------------------
>
>                 Key: PHOENIX-6186
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6186
>             Project: Phoenix
>          Issue Type: New Feature
>            Reporter: Geoffrey Jacoby
>            Assignee: Geoffrey Jacoby
>            Priority: Major
>             Fix For: 4.16.0
>
>         Attachments: PHOENIX-6186-4.x.patch
>
>
> There are many reasons why it's useful to know when a particular table's 
> metadata was last modified. It's helpful when solving cache coherency 
> problems, and also in order to interact with external schema registries which 
> may have multiple versions of a particular schema and require a timestamp to 
> resolve ambiguities. 
> This JIRA will add a last modified timestamp field to System.Catalog, to be 
> updated both when creating a table/view and also when adding or removing a 
> column. Changing purely internal Phoenix properties will not update the 
> timestamp. 



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