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https://issues.apache.org/jira/browse/SOLR-3939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479322#comment-13479322
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Mark Miller commented on SOLR-3939:
-----------------------------------
Joel: It could just be timing - live nodes are likely faster to update than the
cluster state - when you just unload a core, the live node stays - so the
unloaded core will only not take part in leader election when the leader
candidate gets the new cluster state. When you take down a vm, the live node
goes. Perhaps this is noticed faster. In either case, it's a race.
Yonik:
for case one, I'd like to still sync if possible - but if there are no starting
versions in the updatelog, don't worry if the sync was not a success?
I still have to add a test and fix for case 2.
> 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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