Sandbox::https://github.com/feast-dev/feast/pull/6887

dbbvitor · 2026-09-29T00:21:25Z

What this PR does / why we need it:

Merge after #6886.

FeastServices renders every service container's command with a hardcoded IPv4 host flag (-h 0.0.0.0 for online/offline, or the ui/lineage servers' equivalent), with no CRD field to change it. On an IPv6-only or dual-stack cluster, none of these servers bind an address that anything can reach; the Operator half of the same gap #6886 already fixed on the SDK side.

This adds a DualStack *bool field to [ServerConfigs] https://github.com/dbbvitor/feast/blob/feat/operator-dual-stack/infra/feast-operator/api/v1/featurestore_types.go#L904). When set, a new withBindHost() helper rewrites the rendered -h argument pair to the IPv6 wildcard address instead of leaving the hardcoded IPv4 literal:

Online and offline servers (gunicorn, Arrow Flight) need the bracketed form ("[::]"), both reject a bare "::" as a host argument.
ui and lineage servers (uvicorn) reject the bracketed form and need the bare "::" instead.
The registry server takes no --host flag at all and is left untouched; it already always binds dual-stack.

withBindHost() is applied both inside getContainerCommand(), which builds each service Deployment's container args, and in setLineageDeployment(), which builds the lineage container's Command slice directly rather than going through the shared Args path.

Which issue(s) this PR fixes:

Part of #6862 (together with #6886 on the SDK side; don't let this auto-close the issue on merge; #6886 should merge first or alongside, since dualStack doesn't fully work for ui/lineage without it)

Checks

I've made sure the tests are passing.
My commits are signed off (git commit -s)
My PR title follows conventional commits format

Testing Strategy

Unit tests

Misc

DualStack is opt-in (nil/false preserves today's 0.0.0.0 behavior exactly), no change for clusters that don't set it.
This PR's -h :: for the ui/lineage (uvicorn-based) servers only works, end-to-end because fix: Bind metrics, REST registry, ui, and lineage servers dual-stack #6886 now also fixes ui_server.py's start_server() and lineage_server.py's start_lineage_server(): both previously called uvicorn.run(host=host, ...) directly, which sets IPV6_V6ONLY=1 via asyncio's loop.create_server() and would have made those two servers IPv6-only under this option, a silent IPv4 regression, not the dual-stack fix this PR promises.

Add a DualStack field to ServerConfigs that binds server processes to the IPv6 wildcard address instead of 0.0.0.0, so they also accept IPv4 clients on dual-stack or IPv6-only clusters. Online and offline servers use the bracketed [::] form required by gunicorn and Arrow Flight; ui, lineage, and registry keep their existing behavior or use the bare :: form uvicorn expects. The registry server always binds dual-stack and ignores this setting. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

Mutation testing found survivors in withBindHost's loop bounds: an -h flag as the very last argument (no value to replace) and one as the first argument were both untested edge cases. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

codecov-commenter · 2026-09-29T00:25:11Z

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.49%. Comparing base (87ef218) to head (cfab204).
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@@           Coverage Diff           @@
##           master    #6887   +/-   ##
=======================================
  Coverage   49.49%   49.49%           
=======================================
  Files         443      443           
  Lines       55451    55451           
  Branches     8085     8085           
=======================================
  Hits        27443    27443           
  Misses      26110    26110           
  Partials     1898     1898

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The registry's REST server binds dual-stack by default in the SDK CLI. Render -h 0.0.0.0 only when the shared DualStack field is explicitly set to false, so nil/true keep today's dual-stack default instead of silently going IPv4-only. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

Only the generated_at metadata field diverged from master, which was enough for GitHub to report this PR as unmergeable and apparently skip queuing CI. No scan content changed. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

ntkathole · 2026-10-01T13:20:58Z

@dbbvitor I see asymmetry in default behavior, which is confusing:

For non-registry services: nil ≡ false → IPv4. User must opt-in with true.
For registry REST: nil ≡ true → dual-stack. User must opt-out with false.

I think it's better if one field, one meaning, everywhere.

Make unset or false dualStack render an explicit 0.0.0.0 host flag. Only dualStack=true selects the bare IPv6 wildcard, aligning registry REST defaults with other host-flag servers. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

dbbvitor · 2026-10-05T20:24:19Z

@dbbvitor I see asymmetry in default behavior, which is confusing:

For non-registry services: nil ≡ false → IPv4. User must opt-in with true.

For registry REST: nil ≡ true → dual-stack. User must opt-out with false.

I think it's better if one field, one meaning, everywhere.

Agreed. I've changed the code to remove the asymmetry in the design here: c2267df

ntkathole · 2026-10-07T13:20:27Z

@dbbvitor can you please resolve the conflicts

…l-stack Signed-off-by: dbbvitor <vitor.diniz@gympass.com> # Conflicts: # .secrets.baseline # infra/feast-operator/internal/controller/services/services.go

dbbvitor · 2026-10-07T20:33:37Z

@ntkathole The ci error unit-test-go seems unrelated: {"level":"error","error":"open /home/runner/work/feast/feast/go/internal/test/feature_repo/data/registry.db: no such file or directory","time":"2026-10-07T20:09:40Z","message":"Registry Initialization Failed"}

Two consequences due to the recent change + upstream changes:

serve_registry only has -h from fix: Bind metrics, REST registry, ui, and lineage servers dual-stack #6886, so the registry REST server needs an image containing it (after 0.66.0), whether or not dualStack is set. Its old default was dual-stack, and it now needs dualStack: true for that.
The standalone mcpServer embeds ServerConfigs, so the CRD accepts dualStack there, but it has no effect. Binding MCP to IPv6 needs an SDK change too, so I'll send a follow-up PR right after this one.

dbbvitor · 2026-10-08T13:06:25Z

Here is the related PR: #6977

Route the MCP --host through withBindHost, so mcpServer.dualStack renders :: instead of 0.0.0.0. The MCP server itself needs feast mcp --host :: support (feast-dev#6977). Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

dbbvitor added 2 commits September 28, 2026 17:26

test: Cover -h boundary positions in withBindHost

5e78765

Mutation testing found survivors in withBindHost's loop bounds: an -h flag as the very last argument (no value to replace) and one as the first argument were both untested edge cases. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

dbbvitor requested a review from a team as a code owner September 29, 2026 00:21

dbbvitor closed this Sep 29, 2026

dbbvitor reopened this Sep 29, 2026

dbbvitor and others added 7 commits September 29, 2026 23:03

chore: Refresh secrets baseline timestamp to match master

3d5467f

Only the generated_at metadata field diverged from master, which was enough for GitHub to report this PR as unmergeable and apparently skip queuing CI. No scan content changed. Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

Merge branch 'master' into feat/operator-dual-stack

9284756

Merge branch 'master' into feat/operator-dual-stack

55a53f8

Merge branch 'master' into feat/operator-dual-stack

f3995e2

Merge branch 'master' into feat/operator-dual-stack

c7de640

Merge branch 'master' into feat/operator-dual-stack

2074d81

dbbvitor and others added 2 commits October 5, 2026 16:22

Merge branch 'master' into feat/operator-dual-stack

21b9c8b

dbbvitor force-pushed the feat/operator-dual-stack branch from 40d8d19 to c2267df Compare October 5, 2026 19:52

dbbvitor mentioned this pull request Oct 7, 2026

docs: Document the dualStack image requirement dbbvitor/feast#1

Closed

Merge remote-tracking branch 'upstream/master' into feat/operator-dua…

f8c4e5e

…l-stack Signed-off-by: dbbvitor <vitor.diniz@gympass.com> # Conflicts: # .secrets.baseline # infra/feast-operator/internal/controller/services/services.go

dbbvitor mentioned this pull request Oct 8, 2026

feat: Serve the MCP server dual-stack on --host :: #6977

Open

4 tasks done

Merge branch 'master' into feat/operator-dual-stack

02b1e27

dbbvitor and others added 2 commits October 8, 2026 10:15

feat: Bind the standalone MCP server dual-stack with dualStack

a463b72

Route the MCP --host through withBindHost, so mcpServer.dualStack renders :: instead of 0.0.0.0. The MCP server itself needs feast mcp --host :: support (feast-dev#6977). Signed-off-by: dbbvitor <vitor.diniz@gympass.com>

Merge branch 'master' into feat/operator-dual-stack

cfab204

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feat: Add dualStack server option to the Feast operator - #6887

feat: Add dualStack server option to the Feast operator#6887
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dbbvitor commented Sep 29, 2026

What this PR does / why we need it:

Which issue(s) this PR fixes:

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