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Remove deprecated field segmentAssignmentStrategy in SegmentsValidationAndRetentionConfig #18398
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yashmayya
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J-HowHuang:remove-deprecated-table-config
May 4, 2026
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Why do we need this logic?
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This is to see if the table has explicitly configured
REPLICA_GROUP_SEGMENT_ASSIGNMENT_STRATEGYin segment assignment strategy.I don't know whether it's common to have this strategy explicitly set in segment assignment strategy, but this is the same logic as before, just to check from the segment assignment strategy map instead of segment assignment strategy in segment validation config (the deprecated field).
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Line 78 already covers this. When deprecating a field, in most cases we don't need to add new logic
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We always allow instance assignment when
instanceAssignmentConfigis configured. It is not tight to replica group assignment strategyThere was a problem hiding this comment.
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It was this part of the original code
And we're deprecating this so I changed this to its counterpart, which is the
segmentAssignmentConfigMap.Also correctness-wise, in
SegmentAssignmentStrategyFactory#getSegmentAssignmentStrategy, if a table doesn't haveinstanceAssignmentConfigbut has the strategy explicitly set insegmentAssignmentConfigMap, it would use replica group strategy, so this check is relevant in this sense.There was a problem hiding this comment.
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I just realized this is segment assignment config, not instance assignment config.. But this is wrong coupling. Segment assignment config shouldn't interfere with instance assignment. The old
AssignmentStrategy.REPLICA_GROUP_SEGMENT_ASSIGNMENT_STRATEGYhas implicit meaning on both instance assignment and segment assignment, but segment assignment shouldn't be coupled with instance assignment.Segment assignment config is very rarely used (I even forgot its existence). We should also modify all tests to explicitly put instance assignment config instead of segment assignment config.