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https://issues.apache.org/jira/browse/PHOENIX-6082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17236939#comment-17236939
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ASF GitHub Bot commented on PHOENIX-6082:
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virajjasani opened a new pull request #982:
URL: https://github.com/apache/phoenix/pull/982
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> No need to do checkAndPut when altering properties for a table or view with
> column-encoding enabled
> ---------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-6082
> URL: https://issues.apache.org/jira/browse/PHOENIX-6082
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.0.0, 4.15.0
> Reporter: Chinmay Kulkarni
> Assignee: Viraj Jasani
> Priority: Major
> Labels: performance, phoenix-hardening, quality-improvement
> Fix For: 5.1.0, 4.16.0
>
>
> ALTER TABLE/VIEW SET <property> follows the same code path as an add column.
> Thus, when column-encoding is enabled on the physical table, we will do a
> checkAndPut with the <physical table schema name>, <physical table name> (see
> [this|https://github.com/apache/phoenix/blob/4ddbe2688b78645bc73857141cec12cb1c08993b/phoenix-core/src/main/java/org/apache/phoenix/schema/MetaDataClient.java#L3940-L3947]).
> This makes sense when we are adding a column since this causes an update to
> the encoded column qualifier counter of the base table and we want to prevent
> any concurrent changes to this field. However, when setting properties, we
> don't update the column qualifier counter so this extra checkAndPut is
> unnecessary. The server-side [write-lock on the table header
> row|https://github.com/apache/phoenix/blob/4ddbe2688b78645bc73857141cec12cb1c08993b/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2619]
> followed by a [sequence number
> check|https://github.com/apache/phoenix/blob/4ddbe2688b78645bc73857141cec12cb1c08993b/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2684-L2691]
> should be sufficient and is already done.
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