Markus Jelsma created SOLR-10048:
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Summary: Distributed result set paging sometimes yields incorrect
results
Key: SOLR-10048
URL: https://issues.apache.org/jira/browse/SOLR-10048
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: SearchComponents - other
Affects Versions: 6.4
Reporter: Markus Jelsma
Priority: Critical
Fix For: 6.4.1, master (7.0)
This bug appeared in 6.4 and i spotted it yesterday when i upgraded a my
project. It has, amongst others,an extension of QueryComponent, its unit test
failed, but never in any predictable way and always in another spot.
The test is very straightforward, it indexes a bunch of silly documents and
then executes a series of getAll() queries. An array of ids is collected and
stored for comparison. Then, the same query is executed again but it pages
through the entire result set.
It then compares ids, the id at position N must be the same as id NUM_PAGE *
PAGE_SIZE + M (where M is the position of the result in the paged set). The
comparison sometimes failes.
I'll attach the test for 6.4 shortly. If it passes, just try it again (or
increase maxDocs). It can pass over ten times in a row, but it can also fail
ten times in a row.
You should see this if it fails, but probably with different values for
expected and actual. Below was a few minutes ago, now i can't seem to reproduce
it anymore.
{code}
[junit4] FAILURE 25.1s |
DistributedPagedQueryComponentTest.testTheCrazyPager <<<
[junit4] > Throwable #1: java.lang.AssertionError: ids misaligned
expected:<406> but was:<811>
[junit4] > at
__randomizedtesting.SeedInfo.seed([97A7F02D1E4ACF75:7493130F03129E6D]:0)
[junit4] > at
org.apache.solr.handler.component.DistributedPagedQueryComponentTest.testTheCrazyPager(DistributedPagedQueryComponentTest.java:83)
[junit4] > at
org.apache.solr.BaseDistributedSearchTestCase$ShardsRepeatRule$ShardsFixedStatement.callStatement(BaseDistributedSearchTestCase.java:992)
[junit4] > at
org.apache.solr.BaseDistributedSearchTestCase$ShardsRepeatRule$ShardsStatement.evaluate(BaseDistributedSearchTestCase.java:967)
[junit4] > at java.lang.Thread.run(Thread.java:745)
{code}
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