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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 13:56:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477898#comment-13477898
] 

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

So that was the difference between the initial test with all the cores in the single Solr
instance. I ran this test starting up all the cores and then loaded, which hit all the transaction
logs.


                
> 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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