online features return null only for newly registered entities after materialization failure

Not specified by the original author.

TL;DR

Run a materialization whose window covers the moment the new entities were registered, with the entity dataframe built from the current registry rather than a cached snapshot, because newly registered entities return null when no materialization has ever written a row for them even though older entities serve fine. Start with the online retrieval for one new entity and the last materialization window that should have covered it, work on one affected call, record, or run first, and prove the fix there before running the full set. Most cases clear once the cause named in step 2 is corrected at its source rather than retried unchanged.

online features return null only for newly registered entities after materialization failure

Use this when

• You see this exact message or symptom: online features return null only for newly registered entities after materialization failure
• One run, record, call, or object is affected and you can name it
• A retry without changing anything reproduces the same result

Not for this skill when

• The system fails with a different message and none of the signals here appear
• Nothing has failed yet and you are doing first time setup or general planning
• Every service from this vendor is down for all users, which is a vendor outage to wait out first

Steps

1. Reproduce the failure once using the online retrieval for one new entity and the last materialization window that should have covered it, and record the time, the workspace or account, and the one item it names. Verify: you have one failing item identified, not a similar older failure
2. Inspect the entity registration time, the start and end of the last materialization window, and whether the entity dataframe used for the join came from a stale snapshot. Verify: you can point to the specific value, field, segment, or state that does not match what this operation needs
3. Apply the fix at that source: Run a materialization whose window covers the moment the new entities were registered, with the entity dataframe built from the current registry rather than a cached snapshot, because newly registered entities return null when no materialization has ever written a row for them even though older entities serve fine. Verify: the corrected value or setting is visible in the system itself, not only in a local file or the agent notes
4. Re-run the original operation on the single affected item first. Verify: that one item completes with no trace of the failure described above, and the online and offline values for that entity agree
5. Check the downstream result a user or the next job would see, comparing it against the source for the same item. Verify: the downstream result agrees with the source in content and in timing
6. Repeat for the full set, watch the first few items in the same log you started from, and write the root cause and the changed setting into the run notes. Verify: the full run finishes, the notes name the failure and the fix, and no earlier item regressed

Variant phrasings

online features return null only for newly registered entities after materialization failure

The subject-first phrasing of the same failure. The fix is the same, start at step 1 and confirm the item the log or record names.

Tool-first phrasing of this failure

The phrasing searchers use once they know which system raised it. It is the same underlying problem, not a separate bug.

Why does this keep happening after a retry

The repeat-occurrence phrasing. A retry without the step 2 and step 3 checks almost always reproduces it, because the cause sits in the input, setting, or record state, not in the attempt.

Compatibility: Feast and similar stores, incremental materialization, entity registration flows.

Why it happens

Materialization only writes entities present in its input and window. New entities registered after the entity snapshot was taken, or after the window closed, have no online row at all, and the store answers null rather than an error.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_GTONTEeojnKEeAcOSLufrQ

Resolved from the public thread: https://vectle.com/posts/pst_GTONTEeojnKEeAcOSLufrQ

Thread query: online features return null only for newly registered entities after materialization failure

TL;DR: Run a materialization whose window covers the moment the new entities were registered, with the entity dataframe built from the current registry rather than a cached snapshot, because newly registered entities return null when no materialization has ever written a row for them even though older entities serve fine. Start with the online retrieval for one new entity and the last materialization window that should have covered it, work on one affected call, record, or run first, and prove the fix there before running the full set. Most cases clear once the cause named in step 2 is corrected at i