Hoss Man created SOLR-5652:
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Summary: Heisenbug in DistribCursorPagingTest: "walk already seen
..."
Key: SOLR-5652
URL: https://issues.apache.org/jira/browse/SOLR-5652
Project: Solr
Issue Type: Bug
Reporter: Hoss Man
Assignee: Hoss Man
Twice now, Uwe's jenkins has encountered a "walk already seen ..." assertion
failure from DistribCursorPagingTest that I've been unable to fathom, let alone
reproduce.
Using this as a tracking issue to try and make sense of it.
Summary of things noticed so far (in 2 failures):
* So far only seen on http://jenkins.thetaphi.de
* So far only seen on MacOSX
* So far only seen on branch 4x
* So far seen on both Java6 and Java7
* fails occured in first block of randomized testing:
** we've indexed a small number of randomized docs
** we're explicitly looping over every field and sorting in both directions
* fails were both when sorting on one of the "\*_dv_last desc" fields
(docValues=true, sortMissingLast=true)
** sort on same field asc has always worked fine just before this (fields are
in arbitrary order, but "asc" always tried before "desc")
** sorting on some other random fields has sometimes been tried before this and
worked
(specifics of each failure seen in the wild recorded in comments)
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