Kadir OZDEMIR created PHOENIX-6160:
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Summary: Simplifying concurrent mutation handling for global
Indexes
Key: PHOENIX-6160
URL: https://issues.apache.org/jira/browse/PHOENIX-6160
Project: Phoenix
Issue Type: Improvement
Affects Versions: 4.15.0, 5.0.0
Reporter: Kadir OZDEMIR
Assignee: Kadir OZDEMIR
Please see the attached design document for the proposed simplification. The
proposed design is simpler to understand and does not require a special
handling of partial concurrent updates without indexed columns.
One of the desired features for global indexes is to support atomic operations
(ON_DUPLICATE_KEY statements). We have found that it is quite difficult to
build such a feature on the current design as we need to add more case handling
to the current design to handle data table update ordering issues. The proposed
design does not require us to do changes on concurrent mutation handling for
such features.
The proposed design almost eliminates unverified index rows due to concurrent
mutations. The index rows are left unverified only when batches fail to
complete the data table updates. This leads to read performance improvement as
repairing unverified rows is costly and each row repair adds several tens of
milliseconds to the overall scan latency.
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