Christine Poerschke created SOLR-5593:
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Summary: shard leader loss due to ZK session expiry
Key: SOLR-5593
URL: https://issues.apache.org/jira/browse/SOLR-5593
Project: Solr
Issue Type: Improvement
Reporter: Christine Poerschke
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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