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https://issues.apache.org/jira/browse/SOLR-3785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447688#comment-13447688
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Mark Miller commented on SOLR-3785:
-----------------------------------
Well, I added something like this last week, but I'm not sure it covers the
case where there is no other replica to take over as leader.
Last week, I noticed that when a leader goes down, no one removes the leader
marker from the cluster state. I changed it so that the next candidate leader
immediately does this before the leader election process kicks off - this lets
you see the leader briefly go away until a new leader is elected. There has to
be another leader candidate to publish that change currently though (this was
an easy add, that's why I did it that way).
To get it to work where there is no new leader candidate, we have to change it
so that the overseer does this I think.
Thoughts Sami?
> Cluster-state inconsistent
> --------------------------
>
> Key: SOLR-3785
> URL: https://issues.apache.org/jira/browse/SOLR-3785
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.0
> Environment: Self-build Solr release built on Apache Solr revision
> 1355667 from 4.x branch
> Reporter: Per Steffensen
>
> Information in CloudSolrServer.getZkStateReader().getCloudState() (called
> cloudState below) seems to be inconsistent.
> I have a Solr running the leader of slice "sliceName" in collection
> "collectionName" - no replica to take over. I shut down this Solr, and I want
> to detect that there is now no leader active.
> I do e.g.
> {code}
> ZkNodeProps leader = cloudState.getLeader(indexName, sliceName);
> boolean notActive = (leader == null) ||
> !leader.containsKey(ZkStateReader.STATE_PROP) ||
> !leader.get(ZkStateReader.STATE_PROP).equals(ZkStateReader.ACTIVE);
> {code}
> This does not work. It seems like changing state of a shard does it not
> changed when this Solr goes down.
> I do e.g.
> {code}
> ZkNodeProps leader = cloudState.getLeader(indexName, sliceName);
> boolean notActive = (leader == null) ||
> !leader.containsKey(ZkStateReader.STATE_PROP) ||
> !leader.get(ZkStateReader.STATE_PROP).equals(ZkStateReader.ACTIVE) ||
> !leader.containsKey(ZkStateReader.NODE_NAME_PROP) ||
> !cloudState.getLiveNodes().contains(leader.get(ZkStateReader.NODE_NAME_PROP))
> {code}
> Whis works.
> It seems like live-nodes of cloudState is updated when Solr goes down, but
> that some of the other info available through cloudState is not - e.g.
> getLeader().
> This might already have already been solved on 4.x branch in a revision later
> than 1355667. Then please just tell me - thanks.
> Regards, Per Steffensen
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