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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3939) Solr Cloud recovery and leader election when unloading leader core
Date Wed, 17 Oct 2012 20:24:03 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478333#comment-13478333
] 

Joel Bernstein commented on SOLR-3939:
--------------------------------------

Curious as to what the procedure is when the leader VM is taken down, rather then the leader
core is unloaded. This scenario seems to work even when the replica was just be replicated
to. 
                
> Solr Cloud recovery and leader election when unloading leader core
> ------------------------------------------------------------------
>
>                 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: cloud.log, 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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