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https://issues.apache.org/jira/browse/SOLR-4211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Ludwig updated SOLR-4211:
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Summary: LBHttpSolrServer to support graceful shutdown (was:
LBHttpSolrServer)
> LBHttpSolrServer to support graceful shutdown
> ---------------------------------------------
>
> 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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