Jan Høydahl created SOLR-14389:
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Summary: Support dynamic reconfiguration of Zookeeper ensemble
Key: SOLR-14389
URL: https://issues.apache.org/jira/browse/SOLR-14389
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: Jan Høydahl
Spinoff from SOLR-14371.
Zookeeper has got support for dynamic reconfiguration since v3.5 (See
https://zookeeper.apache.org/doc/r3.6.0/zookeeperReconfig.html). But users need
to actively start using it. Currently Solr treats the {{ZK_HOST}} var /
{{-DzkHost}} sysprop as a static truth, and will only ever attempt to connect
to the hosts originally included in the connection string.
This issue aims to implement "Rebalancing Client Connections" as described in
last paragrah in above link. This will let sys admins extend or change their
ensemble, and Solr nodes will update and re-balance, as long as at least one of
the zk hosts are still in the static {{ZK_HOST}} list.
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