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https://issues.apache.org/jira/browse/SOLR-14648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17158133#comment-17158133
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Erick Erickson commented on SOLR-14648:
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[~sayan.das] Hmmm, I suppose we could automatically check the version stamp on
all the PULL replicas, they should be comparable.
[~tflobbe] Right, I think I'd prioritize things this way:
1> don't create a new TLOG replica if there's no leader. You can fix this
manually, but it's be something like
1.1> copy the index from some selected PULL replica somewhere
1.2> nuke the collection
1.3> create a single TLOG replica
1.4> shut down Solr, copy the saved index back and start Solr
1.5> build out the additional PULL replicas
1.6> yuck. but at least it doesn't leave you with nothing.
2> Implement the expert flag to get you out of this mess automatically.
I'll add parenthetically that running with a single TLOG replica has no HA/DR
built in by definition, it's not a good practice. We shouldn't nuke a
collection even so of course.
> Creating TLOG with pure multiple PULL replica, leading to 0 doc count
> ---------------------------------------------------------------------
>
> Key: SOLR-14648
> URL: https://issues.apache.org/jira/browse/SOLR-14648
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 8.3.1
> Reporter: Sayan Das
> Priority: Major
>
> With only PULL replica whenever we create a new TLOG as leader fresh
> replication happens, resulting in flushing the older indexes from existing
> PULL replicas
> Steps to replicate:
> # Create 1 NRT or 1 TLOG replica as leader with multiple PULL replicas
> # Index few documents and let it replicate in all the replicas
> # Delete all the TLOG/NRT replica leaving PULL types
> # Create a new TLOG/NRT as leader, once recovery completes it replaces all
> the older indexes
> In ideal scenario it should have replicated from any one of the PULL replicas
> that has latest indexes after that TLOG/NRT replica should be registered as
> leader
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