kfaraz opened a new pull request, #17824:
URL: https://github.com/apache/druid/pull/17824
### Description
#17653 introduces a cache for segment metadata on the Overlord
If the cache is enabled, the leader Overlord must be fully synced with the
metadata store
before it can start serving task actions or perform any other metadata
operation that uses
the cache. On clusters with a large number of segments (used or unused),
this can task
actions to remain blocked until the leader is fully synced. This, in turn,
may cause ingestion
failures and high lag in case of streaming ingestion
### Changes
- If leader cache is not synced, hit metadata store directly
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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