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PBM 1763 pitr fails with document validation failure - #401
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rasika-chivate
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September 29, 2026 08:05
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🟡 Changes recommended
The workaround must clarify that the runtime parameter needs configuring on applicable mongod instances.
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What changed in this PR
Documents a workaround for PITR failures involving expiring time-series collections.
Changes:
- Explains the TTL monitor failure.
- Advises disabling TTL monitoring during restoration.
| File | Description |
|---|---|
docs/features/known-limitations.md |
Adds the limitation, error, and workaround. |
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Co-authored-by: rasika-chivate <95711051+rasika-chivate@users.noreply.github.com>
…ttribute for ttlMonitorEnabled' Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
jcechace
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Sep 29, 2026
boris-ilijic
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Oct 5, 2026
| (Location6781400) Time series bucket document is missing 'control' field | ||
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| Before starting the restore, manually disable the TTL monitor on every data-bearing `mongod` instance in the target deployment. Keep it disabled for the duration of the restore. The [`ttlMonitorEnabled` :octicons-link-external-16:](https://www.mongodb.com/docs/v8.0/reference/parameters/#mongodb-parameter-param.ttlMonitorEnabled){:target="_blank"} parameter applies to individual instances, so configure each one separately: |
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We should just disable it on the Primary instance on RS, or all Primary instances on every RS (config server + all shards) in sharded cluster.
jcechace
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Documents the TTL limitation for logical restores, including PITR, of time series collections configured with
expireAfterSeconds. Manually disable the TTL monitor before starting the restore and keep it disabled for the duration of the restore. Record each data-bearingmongodinstance's original setting and restore it when the operation ends, even if it fails.Updated
docs/features/known-limitations.md, under Logical restores of time series collections with expiration. The existing page TOC includes this heading; no navigation changes are needed.Sources:
Validation: MkDocs build and
git diff --checkpassed. Verified the rendered page TOC, warning, command blocks and upstream link attributes. Existing unrelated link warnings remain.