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https://issues.apache.org/jira/browse/SOLR-5652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877683#comment-13877683
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Hoss Man commented on SOLR-5652:
--------------------------------
http://jenkins.thetaphi.de/job/Lucene-Solr-4.x-MacOSX/1217/
Revision: 1559847
Using Java: 64bit/jdk1.7.0 -XX:+UseCompressedOops -XX:+UseSerialGC
{noformat}
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=DistribCursorPagingTest -Dtests.method=testDistribSearch
-Dtests.seed=F09D8E3EF23506C2 -Dtests.slow=true -Dtests.locale=sr_RS
-Dtests.timezone=Australia/Tasmania -Dtests.file.encoding=UTF-8
[junit4] FAILURE 21.5s | DistribCursorPagingTest.testDistribSearch <<<
[junit4] > Throwable #1: java.lang.AssertionError: walk already seen: 93,
don't know why; q=id:93 gives:
{responseHeader={status=0,QTime=7},response={numFound=1,start=0,maxScore=4.555348,docs=[SolrDocument{id=93,
long=5077, long_last=5077, long_first=5077, long_dv_last=5077,
long_dv_first=5077, float=-3.6574272E8, float_last=-3.6574272E8,
float_first=-3.6574272E8, float_dv_last=-3.6574272E8,
float_dv_first=-3.6574272E8, double=-1.3713607226255326E9,
double_last=-1.3713607226255326E9, double_first=-1.3713607226255326E9,
double_dv_last=-1.3713607226255326E9, double_dv_first=-1.3713607226255326E9,
str=˜˺ʵ, str_last=˜˺ʵ, str_first=˜˺ʵ, str_dv_last=˜˺ʵ, str_dv_first=˜˺ʵ,
bin=LfuliMaoJJG5866cs8lYmtS89ZDH2owXyi2QPp9kw6zpPlrrT4UAZw==,
bin_last=LfuliMaoJJG5866cs8lYmtS89ZDH2owXyi2QPp9kw6zpPlrrT4UAZw==,
bin_first=LfuliMaoJJG5866cs8lYmtS89ZDH2owXyi2QPp9kw6zpPlrrT4UAZw==,
bin_dv_last=LfuliMaoJJG5866cs8lYmtS89ZDH2owXyi2QPp9kw6zpPlrrT4UAZw==,
bin_dv_first=LfuliMaoJJG5866cs8lYmtS89ZDH2owXyi2QPp9kw6zpPlrrT4UAZw==,
_version_=1457794677110472704}]}}
[junit4] > at
__randomizedtesting.SeedInfo.seed([F09D8E3EF23506C2:717B0026856A66FE]:0)
[junit4] > at
org.apache.solr.cloud.DistribCursorPagingTest.assertFullWalkNoDups(DistribCursorPagingTest.java:636)
[junit4] > at
org.apache.solr.cloud.DistribCursorPagingTest.doRandomSortsOnLargeIndex(DistribCursorPagingTest.java:465)
[junit4] > at
org.apache.solr.cloud.DistribCursorPagingTest.doTest(DistribCursorPagingTest.java:86)
[junit4] > at
org.apache.solr.BaseDistributedSearchTestCase.testDistribSearch(BaseDistributedSearchTestCase.java:867)
[junit4] > at java.lang.Thread.run(Thread.java:744)
{noformat}
One thing that jumps out at me here is that in this failure the doc in question
(93) doesn't have a value for the int_dv_last field being sorted on - no
concrete info on whether that was true in the first failure as well.
The next steps I can think of:
* get the explicit sort criteria into the assertion failure so it's easier to
verify w/o digging through the logs
* add more logging so every time a doc is seen in one of these cursor walks, we
log it's sort value -- i'm still not convinced this problem isn't a general
shard inconsistency problem
> 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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