Kadir OZDEMIR created PHOENIX-5923:
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Summary: 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: 4.14.3, 5.0.0
Reporter: Kadir OZDEMIR
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.
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