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https://issues.apache.org/jira/browse/SOLR-5593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13859600#comment-13859600
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Christine Poerschke commented on SOLR-5593:
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bq. One thing that seems kind of silly is that those replicas reject the
updates at all. It seems like perhaps we should relax things a bit so that they
would be accepted.
Yes, we are working on changes to DistributedUpdateProcessor to relax the
requirement for the getLeaderRetry to succeed within setupRequest (if phase is
DistribPhase.FROMLEADER and the shard state shows it could not be
subShardLeader then getLeaderRetry success should be optional).
> shard leader loss due to ZK session expiry
> ------------------------------------------
>
> Key: SOLR-5593
> URL: https://issues.apache.org/jira/browse/SOLR-5593
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Christine Poerschke
> Assignee: Mark Miller
> Fix For: 5.0, 4.7, 4.6.1
>
> Attachments: CoreAdminHandler.patch
>
>
> The problem we saw was that the shard leader ceased to be shard leader (in
> our case due to its zookeeper session expiring). The followers thus rejected
> update requests (DistributedUpdateProcessor setupRequest's call to
> ZkStateReader getLeaderRetry) and the leader asked them to recover
> (DistributedUpdateProcessor doFinish). The followers published themselves as
> recovering (CoreAdminHandler handleRequestRecoveryAction) and the shard
> leader loss triggered an election in which none of the followers became the
> leader due to their recovering state (ShardLeaderElectionContext
> shouldIBeLeader). The former shard leader also did not become shard leader
> because its new seq number placed it after the existing replicas
> (LeaderElector checkIfIamLeader seq <= intSeqs.get(0)).
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