All, I just filed this JIRA: https://issues.apache.org/jira/browse/ZOOKEEPER-2389
It seems that read-only observer nodes don't properly transition into read-only mode, they fail load any of their synced log data (but if you restart them in read-only mode, they do read the synced data). This is with version 3.4.8. Is this a known issue? Or an expected behavior? It seems like read-only observers would be relatively unusable with the current behavior.... Am I missing something? Are people in general using read-only observer nodes? Thanks, Jason
