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https://issues.apache.org/jira/browse/PHOENIX-3174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514519#comment-15514519
 ] 

Mujtaba Chohan commented on PHOENIX-3174:
-----------------------------------------

[~samarthjain] After upgrading from 4.7 -> 4.9 and then restoring 
SYSTEM.CATALOG snapshot, re-connecting 4.9 client leads to the following error 
(all default Phoenix properties used):

{noformat}
Error: Operation not allowed since cluster hasn't been upgraded. Call EXECUTE 
UPGRADE. (state=INT13,code=2011)
org.apache.phoenix.exception.UpgradeRequiredException: Operation not allowed 
since cluster hasn't been upgraded. Call EXECUTE UPGRADE. 
        at 
org.apache.phoenix.jdbc.PhoenixStatement$1.call(PhoenixStatement.java:275)
        at 
org.apache.phoenix.jdbc.PhoenixStatement$1.call(PhoenixStatement.java:267)
        at org.apache.phoenix.call.CallRunner.run(CallRunner.java:53)
        at 
org.apache.phoenix.jdbc.PhoenixStatement.executeQuery(PhoenixStatement.java:266)
        at 
org.apache.phoenix.jdbc.PhoenixStatement.executeQuery(PhoenixStatement.java:1424)
        at 
org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.getColumns(PhoenixDatabaseMetaData.java:529)
 
{noformat}

> Make minor upgrade a manual step
> --------------------------------
>
>                 Key: PHOENIX-3174
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3174
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: Samarth Jain
>             Fix For: 4.9.0
>
>         Attachments: PHOENIX-3174.patch, PHOENIX-3174_v2.patch, 
> PHOENIX-3174_v3_master.patch, PHOENIX-3174_v4_master.patch, 
> PHOENIX-3174_v5_master.patch
>
>
> Instead of automatically performing minor release upgrades to system tables 
> in an automated manner (on first connection), we should make upgrade a 
> separate manual step. If a newer client attempts to connect to a newer server 
> without the upgrade step having occurred, we'd fail the connection.
> Though not as automated, this would give users more control and visibility 
> into when an upgrade over system tables occurs.



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