Houston Putman created SOLR-16086:
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Summary: Issues with
TestReplicationHandler.doTestIndexFetchOnLeaderRestart
Key: SOLR-16086
URL: https://issues.apache.org/jira/browse/SOLR-16086
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: replication (java), Tests
Affects Versions: 9.0
Reporter: Houston Putman
Ever since early December 2021 the {{doTestIndexFetchOnLeaderRestart}} test has
been failing around 3% of the time. It looks like this was introduced by
SOLR-15590. When drilling into why the test fails, it looks like the
replication never happens in the follower (no logging whatsoever of the
replication handler or the index fetcher). This indicates that there is
something that is hanging in the first replication call request. The
indexFetcher start the fetching thread at a random interval between 1 ms and
1000 ms. After the follower is started, the leader is restarted. It generally
(from my observation) takes around 30 ms for this to happen. Meaning that 3% of
the tests will have the first indexFetcher request sent while the leader is
restarting, which is in line with the failure rate we are seeing.
Mike Drob and I could not get the hanging indexFetcher request to replicate
locally, so this is still conjecture, and we are unsure as to how SOLR-15590
would be affecting it.
Side note: When looking at the history of the test, it looks like the original
purpose of the test is no longer tested for as well. Originally the last part
of the test was to make sure that there was only 1 successful index
replication, that test has now been moved to before the leader is started up
again. This no longer checks that a full replication happens after the leader
starts. So we just need to add that check in at the back of the test. (This was
changed in SOLR-13577)
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