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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3939) An empty or just replicated index cannot become the leader of a shard after a leader goes down.
Date Fri, 26 Oct 2012 15:31:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485000#comment-13485000
] 

Mark Miller commented on SOLR-3939:
-----------------------------------

Okay, I'm going to resolve this - we can make a new issue for the case where a replica comes
up and is ahead somehow.
                
> 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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