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https://issues.apache.org/jira/browse/SOLR-11431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547567#comment-16547567
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Peter Somogyi commented on SOLR-11431:
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[[email protected]], could you check the pull request I posted?
> Leader candidate cannot become leader if replica responds 500 to PeerSync
> -------------------------------------------------------------------------
>
> Key: SOLR-11431
> URL: https://issues.apache.org/jira/browse/SOLR-11431
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 7.0
> Reporter: Mano Kovacs
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When leader candidate does PeerSync to all replicas, to download any missing
> updates, it is tolerant to failures. It uses {{cantReachIsSuccess=true}}
> switch which handles connection issue, 404 and 503 as success, since replicas
> being DOWN should not affect the process.
> However, if a replica has disk issues, the core initialization might fail and
> that results in {{500}} instead of {{503}}. I failing replica like that can
> prevent any other replicas becoming the leader.
> Proposing either:
> * Accepting {{500}} as "cant reach" so leader candidate can go on
> or
> * Changing {{SolrCoreInitializationException}} to return {{503}} instead of
> {{500}}
> * * this might be API change, however
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