Kevin Ludwig created SOLR-4211:
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Summary: LBHttpSolrServer
Key: SOLR-4211
URL: https://issues.apache.org/jira/browse/SOLR-4211
Project: Solr
Issue Type: New Feature
Components: clients - java
Affects Versions: 4.0
Reporter: Kevin Ludwig
Priority: Minor
I would like for SOLRJ's LBHttpSolrServer to support graceful shutdown of SOLR
machines. SOLR's PingRequestHandler (e.g. "/admin/ping") already has support
for healthcheck files, and LBHttpSolrServer already has a ping() method that
calls this endpoint.
Recent changes in LBHttpSolrServer introduced the notion of an alive list and a
zombie list, as well as a background thread to check for dead nodes that are
back alive. My proposal is to have the background thread:
1. determine if nodes are alive via ping() rather than query("*:*").
2. also check for alive servers that have gone out of service (again, via
ping()).
Also the basic logic in the public request method is to try all alive nodes,
and if none are reachable then try each zombie. If a node is brought offline
(via removing healthcheck file, causing ping() to fail) then this retry should
not be done.
I'm willing to submit a patch for this if needed.
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