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Posted to dev@lucene.apache.org by "Hoss Man (JIRA)" <ji...@apache.org> on 2014/01/21 19:10:19 UTC
[jira] [Commented] (SOLR-5652) Heisenbug in
DistribCursorPagingTest: "walk already seen ..."
[ https://issues.apache.org/jira/browse/SOLR-5652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877675#comment-13877675 ]
Hoss Man commented on SOLR-5652:
--------------------------------
http://jenkins.thetaphi.de/job/Lucene-Solr-4.x-MacOSX/1200/
Revision: 1558588
Using Java: 64bit/jdk1.6.0 -XX:-UseCompressedOops -XX:+UseParallelGC
{noformat}
[junit4] 2> NOTE: reproduce with: ant test -Dtestcase=DistribCursorPagingTest -Dtests.method=testDistribSearch -Dtests.seed=B7F9EFE0FC392581 -Dtests.slow=true -Dtests.locale=es_MX -Dtests.timezone=America/Tortola -Dtests.file.encoding=ISO-8859-1
[junit4] FAILURE 29.3s | DistribCursorPagingTest.testDistribSearch <<<
[junit4] > Throwable #1: java.lang.AssertionError: walk already seen: 39
[junit4] > at __randomizedtesting.SeedInfo.seed([B7F9EFE0FC392581:361F61F88B6645BD]:0)
[junit4] > at org.apache.solr.cloud.DistribCursorPagingTest.assertFullWalkNoDups(DistribCursorPagingTest.java:628)
[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:695)
{noformat}
After this I made teh following commits to tryand help track down the bug, in the hopes it would uncover some shard out of sync problems (which is the only explanation i could think of)...
https://svn.apache.org/r1558939
https://svn.apache.org/r1558945
> 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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