thelabdude opened a new pull request #133:
URL: https://github.com/apache/solr/pull/133
# Description
IndexFetcher was triggering a local commit for a PULL replica core which
caused a race condition where the PULL replica would think its index generation
/ version were the same as the leader (see log I posted in JIRA).
From IndexFetcher, line 479:
```
if (skipCommitOnLeaderVersionZero) {
openNewSearcherAndUpdateCommitPoint();
} else {
SolrQueryRequest req = new LocalSolrQueryRequest(solrCore, new
ModifiableSolrParams());
solrCore.getUpdateHandler().commit(new CommitUpdateCommand(req,
false));
}
```
This would cause the PULL replica to not sync index updates with the leader
in the tests (since they do it doc at a time).
# Solution
I don't think PULL replicas should ever commit locally and should always get
the index from the leader. So this PR ensures that
`skipCommitOnLeaderVersionZero` is `true` for PULL replicas, which avoids this
race condition.
# Tests
Removing `@BadApple` from several flaky tests that pass consistently now:
200/200 beasts (tests would fail within about 40 beast runs w/o this fix)
# Checklist
Please review the following and check all that apply:
- [ ] I have reviewed the guidelines for [How to
Contribute](https://wiki.apache.org/solr/HowToContribute) and my code conforms
to the standards described there to the best of my ability.
- [ ] I have created a Jira issue and added the issue ID to my pull request
title.
- [ ] I have given Solr maintainers
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
to contribute to my PR branch. (optional but recommended)
- [ ] I have developed this patch against the `main` branch.
- [ ] I have run `./gradlew check`.
- [ ] I have added tests for my changes.
- [ ] I have added documentation for the [Reference
Guide](https://github.com/apache/solr/tree/main/solr/solr-ref-guide)
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