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https://issues.apache.org/jira/browse/SOLR-6420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170658#comment-14170658
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Shalin Shekhar Mangar commented on SOLR-6420:
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The only reason I can think when such a problem will happen is if Lucene/Solr
lied about the current index generation/version (returned 0 for both) and Solr
thinks that the replication actually succeeded. We don't guarantee anything
when you're running unreleased code and there's no way for me to verify/fix
this bug in the absence of the exact bits you deployed and your index files and
even then it probably won't be a high priority (I'd rather fix bugs that we've
released).
> ADDREPLICA can add a replica that reports green without actually replicating
> ----------------------------------------------------------------------------
>
> Key: SOLR-6420
> URL: https://issues.apache.org/jira/browse/SOLR-6420
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10
> Environment: Ubuntu 14.04
> Reporter: Ralph Tice
> Priority: Critical
> Labels: SolrCloud, difficulty-medium, impact-high
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> I am running Solr built off branch_4x, and thanks to some help from IRC
> ([[email protected]]) we've determined that we have an incompatible
> index situation where we have indexes built with 4.9 that we can read but not
> index into further or update. In this situation, if I try to add a replica,
> this also fails, however, the only log ouput (at WARN threshold) is:
> 16:21:58.156 [RecoveryThread] WARN org.apache.solr.update.PeerSync - no
> frame of reference to tell if we've missed updates
> ...and the replica comes up green. I think this might indicate a missing
> integrity check on replication but certainly IMO a replica should report as
> green/active if it is not on the same revision as the leader, or at least if
> it has never been on the same revision as the leader.
> Shards built with the currently running version of Solr are able to
> successfully ADDREPLICA as expected.
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