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https://issues.apache.org/jira/browse/PHOENIX-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323391#comment-15323391
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James Taylor commented on PHOENIX-2968:
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If I understand this correctly, we are still making an RPC when an ALTER
statement is run over a table with APPEND_ONLY_SCHEMA = true. This should not
be necessary - we should be able to move the code in
MetaDataClient.createTable() to MetaDataClient.addColumn() and simply always
call it when APPEND_ONLY_SCHEMA is set to true so we get the reduced RPC
benefit for both CREATE TABLE and ALTER TABLE or ALTER VIEW.
> Minimize RPCs for ALTER statement over APPEND_ONLY_SCHEMA
> ---------------------------------------------------------
>
> Key: PHOENIX-2968
> URL: https://issues.apache.org/jira/browse/PHOENIX-2968
> Project: Phoenix
> Issue Type: Bug
> Reporter: Mujtaba Chohan
> Assignee: James Taylor
> Labels: Argus
> Fix For: 4.9.0
>
>
> View is created with {{CREATE VIEW IF NOT EXISTS ... APPEND_ONLY_SCHEMA =
> true, UPDATE_CACHE_FREQUENCY=900000}}
> If {{ALTER VIEW <VIEW_NAME> ADD IF NOT EXISTS MYCOL VARCHAR}} is executed
> before each upsert statement then performance for each 1K batch upsert
> degrades by ~40X (50ms for 1K batch without alter statement vs 2300ms with
> alter statement)
> This is for the case when MYCOL exists.
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