Binoy Dalal created SOLR-11478:
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Summary: Solr should remove it's entry from live_nodes in zk
immediately on shutdown and add after solr has loaded it's cores and is ready
to serve requests.
Key: SOLR-11478
URL: https://issues.apache.org/jira/browse/SOLR-11478
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: Binoy Dalal
Priority: Minor
Solr currently, upon receiving the stop command, removes its entry from the zk
/live_nodes znode after it has finished processing all inflight requests, just
before finally shutting down.
In this case, any applications that depend on a solr node's live_node entry to
decide whether or not to query it fail once the stop command has been executed
but solr has not yet fully shut down.
Something similar occurs during startup of a solr node. The solr node seems to
add it's entry to the /live_nodes in zk once it is up but before it has started
accepting requests and once again, this causes dependent applications to fail
in a similar fashion.
Hence, removal of the node entry and addition of the same to the zk live_nodes
immediately upon shutting down and at the very end upon coming up respectively
will greatly benefit applications that depend the live_nodes znode.
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