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https://issues.apache.org/jira/browse/SOLR-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14557786#comment-14557786
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Timothy Potter commented on SOLR-7587:
--------------------------------------

Just a heads up on this ... I had to commit a possible fix as I haven't been 
able to reproduce the hangs locally. The fix moves the call to 
UpdateLog.onFirstSearcher to the end of the SolrCore ctor as it only needs to 
run once per core initialization.

> TestSpellCheckResponse stalled and never timed out -- possible VersionBucket 
> bug? (5.2 branch)
> ----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-7587
>                 URL: https://issues.apache.org/jira/browse/SOLR-7587
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Hoss Man
>            Assignee: Timothy Potter
>            Priority: Blocker
>             Fix For: 5.2
>
>         Attachments: jstack.1.txt, jstack.2.txt, 
> junit4-J0-20150522_181244_599.events, junit4-J0-20150522_181244_599.spill, 
> junit4-J0-20150522_181244_599.suites
>
>
> On the 5.2 branch (r1681250), I encountered a solrj test stalled for over 110 
> minutes before i finally killed it...
> {noformat}
>    [junit4] Suite: org.apache.solr.common.util.TestRetryUtil
>    [junit4] Completed [55/60] on J1 in 1.04s, 1 test
>    [junit4] 
>    [junit4] HEARTBEAT J0 PID(12147@tray): 2015-05-22T18:14:56, stalled for  
> 121s at: TestSpellCheckResponse.testSpellCheckResponse
>    [junit4] HEARTBEAT J0 PID(12147@tray): 2015-05-22T18:15:56, stalled for  
> 181s at: TestSpellCheckResponse.testSpellCheckResponse
> ...
>    [junit4] HEARTBEAT J0 PID(12147@tray): 2015-05-22T20:00:56, stalled for 
> 6481s at: TestSpellCheckResponse.testSpellCheckResponse
>    [junit4] HEARTBEAT J0 PID(12147@tray): 2015-05-22T20:01:56, stalled for 
> 6541s at: TestSpellCheckResponse.testSpellCheckResponse
>    [junit4] HEARTBEAT J0 PID(12147@tray): 2015-05-22T20:02:56, stalled for 
> 6601s at: TestSpellCheckResponse.testSpellCheckResponse
> {noformat}
> I'll attach some jstack output as well as all the temp files from the J0 
> runner.



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