Luke Kot-Zaniewski created SOLR-17745:
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Summary: Reduce leader election optimization never occurs
Key: SOLR-17745
URL: https://issues.apache.org/jira/browse/SOLR-17745
Project: Solr
Issue Type: Bug
Affects Versions: 9.8.1, 8.11.4
Reporter: Luke Kot-Zaniewski
It appears the optimization in SOLR-14942 never actually happens. The reason is
the seemingly innocuous check of
[zkController.isClosed|https://github.com/apache/solr/blob/57de0e8dece2f333a624b6498d139af31d00038c/solr/core/src/java/org/apache/solr/cloud/ZkController.java#L2154]
which actually ends up always skipping the leader election node cleanup. This
is *not* because the ZK session is actually closed but rather a side-effect of
the complex implementation of
[SolrZkClient::isClosed|https://github.com/apache/solr/blob/d1498e8d5a7f4382a83a2800a0d1568bcd0f2a55/solr/solrj-zookeeper/src/java/org/apache/solr/common/cloud/SolrZkClient.java#L852-L854]
which also checks its "higher level" for closure. The higherLevelIsClosed
delegates to
[CoreContainer::isShutDown|https://github.com/apache/solr/blob/6d84e8f97611685df7b39278737ca7bc9fc326d8/solr/core/src/java/org/apache/solr/cloud/ZkController.java#L355]
which actually gets set to true in an [earlier point in the shutdown
sequence|https://github.com/apache/solr/blob/6d84e8f97611685df7b39278737ca7bc9fc326d8/solr/core/src/java/org/apache/solr/core/CoreContainer.java#L1299-L1308].
Thus this optimization never materializes.
A seemingly easy fix for this would be to check SolrZkClient::isConnected
instead of isClosed. Will follow up with a PR.
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