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ASF GitHub Bot commented on PHOENIX-3534: ----------------------------------------- Github user twdsilva commented on a diff in the pull request: https://github.com/apache/phoenix/pull/303#discussion_r201799117 --- Diff: phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java --- @@ -1779,13 +2174,65 @@ public void createTable(RpcController controller, CreateTableRequest request, } } + // The mutations to create a table are written in the following order: + // 1. Write the child link as if the next two steps fail we + // ignore missing children while processing a parent + // 2. Update the encoded column qualifier for the parent table if its on a + // different region server (for tables that use column qualifier encoding) + // if the next step fails we end up wasting a few col qualifiers + // 3. Finally write the mutations to create the table + + // From 4.15 the parent->child links are stored in a separate table SYSTEM.CHILD_LINK + List<Mutation> childLinkMutations = MetaDataUtil.removeChildLinks(tableMetadata); --- End diff -- I filed PHOENIX-4810 and added a comment to reference this jira. > 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 > Fix For: 5.0.0, 4.15.0 > > Attachments: PHOENIX-3534.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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)