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https://issues.apache.org/jira/browse/SOLR-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551461#comment-13551461
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Mark Miller commented on SOLR-4165:
-----------------------------------
Hey Markus - how were you stopping the node? Standard stop or kill? A standard
stop should pull the node out of live nodes pretty darn quickly...
> Queries blocked when stopping and starting a node
> -------------------------------------------------
>
> Key: SOLR-4165
> URL: https://issues.apache.org/jira/browse/SOLR-4165
> Project: Solr
> Issue Type: Bug
> Components: search, SolrCloud
> Affects Versions: 5.0
> Environment: 5.0-SNAPSHOT 1366361:1420056M - markus - 2012-12-11
> 11:52:06
> Reporter: Markus Jelsma
> Assignee: Mark Miller
> Priority: Critical
> Fix For: 4.1, 5.0
>
>
> Our 10 node test cluster (10 shards, 20 cores) blocks incoming queries
> briefly when a node is stopped gracefully and again blocks queries for at
> least a few seconds when the node is started again.
> We're using siege to send roughly 10 queries per second to a pair a load
> balancers. Those load balancers ping (admin/ping) each node every few hundres
> milliseconds. The ping queries continue to operate normally while the
> requests to our main request handler is blocked. A manual request directly to
> a live Solr node is also blocked for the same duration.
> There are no errors logged. But it is clear that the the entire cluster
> blocks queries as soon as the starting node is reading its config from
> Zookeeper, likely even slightly earlier.
> The blocking time when stopping a node varies between 1 or 5 seconds. The
> blocking time when starting a node varies between 10 up to 30 seconds. The
> blocked queries come rushing in again after a queue of ping requests are
> served. The ping request sets the main request handler via the qt parameter.
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