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From "Hoss Man (JIRA)" <>
Subject [jira] [Created] (SOLR-5652) Heisenbug in DistribCursorPagingTest: "walk already seen ..."
Date Tue, 21 Jan 2014 18:10:19 GMT
Hoss Man created SOLR-5652:

             Summary: Heisenbug in DistribCursorPagingTest: "walk already seen ..."
                 Key: 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
* 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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