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Posted to dev@lucene.apache.org by "Hoss Man (JIRA)" <ji...@apache.org> on 2014/02/10 19:50:19 UTC
[jira] [Commented] (SOLR-5671) Heisenbug #2 in
DistribCursorPagingTest: full walk returns one fewer doc than expected
[ https://issues.apache.org/jira/browse/SOLR-5671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13896840#comment-13896840 ]
Hoss Man commented on SOLR-5671:
--------------------------------
Given this...
bq. All the failures were using either Lucene41 or Lucene42 codec
... and the fact that (as far as i can tell) we haven't seen any more failures of this type since the codec constraints were added to the test in SOLR-5652, my hunch is that this is the same test bug manifesting itself in a slightly different way: just as the non-deterministic behavior the docvalues w/missing value caused a doc to appear twice in SOLR-5652, shifting from it's originla position to a later position on a subsequent request, it's easily concievable that the same non-deterministic behavior could cause a doc to shift to an early position -- prior to the current cursor page -- on subsequent requests, causing that doc to be skipped entirely.
I think we can go ahead and resolve this -- if it does pop up again we can re-open (and we'll have the better assertion failure message steve added to help diagnose)
> Heisenbug #2 in DistribCursorPagingTest: full walk returns one fewer doc than expected
> ---------------------------------------------------------------------------------------
>
> Key: SOLR-5671
> URL: https://issues.apache.org/jira/browse/SOLR-5671
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.7
> Reporter: Steve Rowe
> Fix For: 5.0, 4.7
>
>
> Twice on Uwe's Jenkins, DistribCursorPagingTest has paged through a small number of indexed docs and retrieved one fewer doc than the number of indexed docs. Both of these failures were on trunk on Windows:
> http://jenkins.thetaphi.de/job/Lucene-Solr-trunk-Windows/3708/
> http://jenkins.thetaphi.de/job/Lucene-Solr-trunk-Windows/3713/
> I've also seen this twice on trunk on my OS X laptop (out of 875 trials).
> None of the seeds have reproduced for me.
> All the failures were using either Lucene41 or Lucene42 codec
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