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https://issues.apache.org/jira/browse/PHOENIX-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495725#comment-16495725
]
ASF GitHub Bot commented on PHOENIX-3534:
-----------------------------------------
Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/303#discussion_r191933107
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java
---
@@ -2967,6 +2982,11 @@ protected PhoenixConnection
upgradeSystemCatalogIfRequired(PhoenixConnection met
HTableDescriptor.SPLIT_POLICY + "='" +
SystemStatsSplitPolicy.class.getName() +"'"
);
}
+ // TODO set the version for which the following upgrade code runs
correct
+ if (currentServerSideTableTimeStamp <
MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP_4_14_0) {
--- End diff --
Yes - just add a MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP_4_15_0
> Support multi region SYSTEM.CATALOG table
> -----------------------------------------
>
> Key: PHOENIX-3534
> URL: https://issues.apache.org/jira/browse/PHOENIX-3534
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: Thomas D'Silva
> Priority: Major
> Attachments: PHOENIX-3534-wip.patch
>
>
> Currently Phoenix requires that the SYSTEM.CATALOG table is single region
> based on the server-side row locks being held for operations that impact a
> table and all of it's views. For example, adding/removing a column from a
> base table pushes this change to all views.
> As an alternative to making the SYSTEM.CATALOG transactional (PHOENIX-2431),
> when a new table is created we can do a lazy cleanup of any rows that may be
> left over from a failed DDL call (kudos to [~lhofhansl] for coming up with
> this idea). To implement this efficiently, we'd need to also do PHOENIX-2051
> so that we can efficiently find derived views.
> The implementation would rely on an optimistic concurrency model based on
> checking our sequence numbers for each table/view before/after updating. Each
> table/view row would be individually locked for their change (metadata for a
> view or table cannot span regions due to our split policy), with the sequence
> number being incremented under lock and then returned to the client.
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