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https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494966#comment-13494966
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Commit Tag Bot commented on SOLR-3939:
--------------------------------------

[branch_4x commit] Mark Robert Miller
http://svn.apache.org/viewvc?view=revision&revision=1397672

SOLR-3939: Consider a sync attempt from leader to replica that fails due to 404 
a success.
SOLR-3940: Rejoining the leader election incorrectly triggers the code path for 
a fresh cluster start rather than fail over.


                
> An empty or just replicated index cannot become the leader of a shard after a 
> leader goes down.
> -----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-3939
>                 URL: https://issues.apache.org/jira/browse/SOLR-3939
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.0-BETA, 4.0
>            Reporter: Joel Bernstein
>            Assignee: Mark Miller
>            Priority: Critical
>              Labels: 4.0.1_Candidate
>             Fix For: 4.1, 5.0
>
>         Attachments: cloud2.log, cloud.log, SOLR-3939.patch, SOLR-3939.patch
>
>
> When a leader core is unloaded using the core admin api, the followers in the 
> shard go into recovery but do not come out. Leader election doesn't take 
> place and the shard goes down.
> This effects the ability to move a micro-shard from one Solr instance to 
> another Solr instance.
> The problem does not occur 100% of the time but a large % of the time. 
> To setup a test, startup Solr Cloud with a single shard. Add cores to that 
> shard as replicas using core admin. Then unload the leader core using core 
> admin. 

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