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From "Mark Miller (JIRA)" <>
Subject [jira] [Updated] (SOLR-4165) Queries blocked when stopping and starting a node
Date Fri, 04 Jan 2013 16:46:12 GMT


Mark Miller updated SOLR-4165:

    Fix Version/s: 4.1
> Queries blocked when stopping and starting a node
> -------------------------------------------------
>                 Key: SOLR-4165
>                 URL:
>             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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