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https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610642#comment-13610642
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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=1402361
SOLR-3933: Distributed commits are not guaranteed to be ordered within a
request.
SOLR-3939: An empty or just replicated index cannot become the leader of a
shard after a leader goes down.
SOLR-3971: A collection that is created with numShards=1 turns into a
numShards=2 collection after starting up a second core and not specifying
numShards.
SOLR-3932: SolrCmdDistributorTest either takes 3 seconds or 3 minutes.
> 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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