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https://issues.apache.org/jira/browse/SOLR-14371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076402#comment-17076402
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Houston Putman commented on SOLR-14371:
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+1
I like the new patch, and I think it's a great intermediary step until we can
get Solr to work with reconfiguration.
I did a bit of research into the ZK client libraries late last week to see why
the reconfiguration wasn't supported there. I didn't really find anything
except for the fact that the only HostProvider available is still the
{{StaticHostProvider}}, which merely loops through the hosts provided in the
connection string.
Thanks so much for doing all of this testing and research. I'll dive into the
solr-operator issue when I get the chance, but fixing that should be relatively
easier.
> Zk StatusHandler should know about dynamic zk config
> ----------------------------------------------------
>
> Key: SOLR-14371
> URL: https://issues.apache.org/jira/browse/SOLR-14371
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Major
> Attachments: dynamic-reconfig-warning.png, dynamic-reconfig.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> With v3.5, Zookeeper supports [dynamic
> reconfig|https://zookeeper.apache.org/doc/r3.6.0/zookeeperReconfig.html].
> Solr will happily connect to an ensemble with dynamic reconfiguration
> enabled, but it is not "aware of it". The ZK Status screen does not display
> whether the ensemble is in reconfig mode and is not able to load the dynamic
> set of hosts from zk.
> This JIRA aims to make the ZookeeperStatusHandler able to display zk status
> as well as show status for all zk hosts in the ensemble, even ones that are
> not part of the static connection string that Solr is aware of. It will also
> show warnings if Solr's static zk connection string is out of sync with the
> truth.
> Currently Solr has a static ZK connection string and is not able to
> re-configure itself when zk cluster is reconfigured. Fixing this is not part
> of this issue but is deferred to SOLR-14389.
> I discovered this while experimenting with the [solr-operator for
> Kubernetes|https://github.com/bloomberg/solr-operator]. It configures a
> reconfigurable ZK ensemble and configures a single LB host:port as its zk
> connection string. This issue will flag a warning in this case since the
> connection string is different from the set of zk hosts in zk node
> {{/zookeeper/config}}. This warning can be removed once Solr fully supports
> dynamic reconfiguration.
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