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https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484652#comment-13484652
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Joel Bernstein commented on SOLR-3939:
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I ran the Oct 14th test and the leader election worked perfectly. Then I tested
shutting down the leader VM instead of unloading the loader core and this
worked fine.
Then I tried a leader with two replicas that had both just been replicated to.
When I unloaded the leader neither replica became leader. But this was the case
that was not yet accounted for I believe.
I can't think of a use case where the second scenario would happen though.
The first scenario though is critical for migrating micro-shards, so it's great
that you committed this.
Thanks for your work on this issue.
Joel
> 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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