Gregg Donovan created SOLR-5805:
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Summary: SolrCloud: run a healthcheck in a background thread
Key: SOLR-5805
URL: https://issues.apache.org/jira/browse/SOLR-5805
Project: Solr
Issue Type: Improvement
Components: SolrCloud
Affects Versions: 4.7
Reporter: Gregg Donovan
>From a [discussion|http://search-lucene.com/m/QTPaJeWIM/] on the mailing list:
We had a brief SolrCloud outage this weekend when a node's SSD began to fail
but the node still appeared to be up to the rest of the SolrCloud cluster (i.e.
still green in clusterstate.json). Distributed queries that reached this node
would fail but whatever heartbeat keeps the node in the clusterstate.json must
have continued to succeed.
We eventually had to power the node down to get it to be removed from
clusterstate.json.
Mark Miller:
"One simple improvement might even be a background thread that periodically
checks some local readings and depending on the results, pulls itself out of
the mix as best it can (remove itself from clusterstate.json or simply closes
it’s zk connection)."
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