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Posted to issues@lucene.apache.org by "Erick Erickson (Jira)" <ji...@apache.org> on 2019/09/29 16:41:00 UTC
[jira] [Commented] (SOLR-13801) Solr webapp should query zookeeper
for active hosts for zk >3.5
[ https://issues.apache.org/jira/browse/SOLR-13801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940483#comment-16940483 ]
Erick Erickson commented on SOLR-13801:
---------------------------------------
Currently the admin UI uses the 4-letter-words for its status. The admin UI is the _only_ place in solr that relies on them. SOLR-13502 is about not using them any more and using the admin sever (?) to get the information.
This is just an FYI for anyone who wants to pick it up to coordinate any changes with 13502 if possible.
> Solr webapp should query zookeeper for active hosts for zk >3.5
> ---------------------------------------------------------------
>
> Key: SOLR-13801
> URL: https://issues.apache.org/jira/browse/SOLR-13801
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI
> Affects Versions: 7.7, 8.1, 8.2
> Reporter: Ween Jiann
> Priority: Major
>
> Solr webapp only reports a single server although solr-zookeeper-headless points to multiple zkservers. The web app can query zk for active servers which are listed in /zookeeper/config znode made available in zk >3.5. This is especially useful as zk is capable of dynamic reconfiguration.
> {quote}Status: red
> Errors:
> "Leader reports 2 followers, but we only found 0. Please check zkHost configuration"; "We do not have a leader" (either one)
> ZK connection string: solr-zookeeper-headless:2181
> Ensemble size: 1
> {quote}
> Shawn has summed it up perfectly.
> "Solr should query the ZK client for information about what server hosts are active, rather than relying on the connection string, unless that information cannot be obtained by the client."
> For more details:
> [https://lucene.472066.n3.nabble.com/How-to-resolve-a-single-domain-name-to-multiple-zookeeper-IP-in-Solr-td4450236.html]
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