[WAGED Tag Isolation 13/16] Document the design - #293
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Add the design doc for the feature built in this stack: why a global rebalancer freezes every clique when one cannot be placed, why the isolation unit is the share block rather than the resource, how the assignment metadata store stays deterministic across controller failover, and what the flag does not change. Kept to the end of the stack on purpose, so it describes code that already exists rather than code that might.
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September 20, 2026 13:16
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Description
Docs only. Covers why a global rebalancer freezes every clique when one cannot be placed, why the isolation unit is the share block rather than the resource, how the assignment metadata store stays deterministic across controller failover, and what the flag does not change.
Placed near the end of the stack on purpose, so it describes code that already exists.
Stacked PR 13 of 16 of the WAGED instance tag isolation stack.
lzd/waged-iso-12-integrationwaged-tag-based-isolation, which merges intodevat the endTests
Not applicable, documentation only.
Changes that Break Backward Compatibility
None. The new cluster config flag defaults to false, and with it off every code path added here behaves exactly as it does today.
Documentation
This PR is the documentation. It adds
docs/design/002-waged-instance-tag-isolation.md.Code Quality
Formatted with helix-style.xml.