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https://issues.apache.org/jira/browse/PHOENIX-5923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260110#comment-17260110
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ASF GitHub Bot commented on PHOENIX-5923:
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gokceni closed pull request #1063:
URL: https://github.com/apache/phoenix/pull/1063
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> Supporting the single cell storage format for mutable global indexes
> --------------------------------------------------------------------
>
> Key: PHOENIX-5923
> URL: https://issues.apache.org/jira/browse/PHOENIX-5923
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.0.0, 4.14.3
> Reporter: Kadir OZDEMIR
> Assignee: Gokcen Iskender
> Priority: Major
> Attachments: PHOENIX-5923.4.x.001.patch, PHOENIX-5923.master.001.patch
>
>
> It is known that IMMUTABLE_STORAGE_SCHEME = SINGLE_CELL_ARRAY_WITH_OFFSETS
> leads to performance improvement and storage saving. As the name implies this
> storage scheme is currently supported for immutable tables only. Supporting
> the SINGLE_CELL_ARRAY_WITH_OFFSETS storage format for mutable table requires
> reading existing rows for before mutating them, i.e., read-modify-write.
> However, this storage scheme can be used for mutable global index tables
> without any additional IO operation since for every index table update, we
> always read the corresponding data table row and generate the full index row
> from the current state of the data table row and the pending mutation on this
> row. This full index row can be stored using the
> SINGLE_CELL_ARRAY_WITH_OFFSETS storage format even though the data table can
> continue using a mutable storage format. This will allow index tables to
> enjoy the performance improvement and storage saving due to this storage
> format.
>
> Gokcen Iskender: We can also repurpose this Jira and add immutable tables as
> well. We can say that the Immutable tables can have ONE_CELL_PER_COLUMN
> storage format and have indexes that have SINGLE_CELL_ARRAY_WITH_OFFSETS.
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