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https://issues.apache.org/jira/browse/SOLR-10048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Markus Jelsma closed SOLR-10048.
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> 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: 6.5, master (7.0)
>
> Attachments: DistributedPagedQueryComponentTest.java
>
>
> 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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