Markus Jelsma created SOLR-4165:
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Summary: 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
Priority: Critical
Fix For: 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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