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https://issues.apache.org/jira/browse/SOLR-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743775#action_12743775
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Lance Norskog commented on SOLR-1143:
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If the search subsystem has a problem, the ops team wants to know about it and
fix it. This just hides problems.
An example: 2 servers with the same shard are behind a load balancer. One
server fails. The load balancer notices this and directs all traffic to the
other server.
This is a production network which serves and outside API, where everything is
supposed to work >from the viewpoint of the outside API<. When the load
balancer gets a failure it usually returns an error on that one request, then
marks the server down. So that one search request eventually returns with a
"temporary error" condition.
These search requests come from an app server which serves the API. The app
server then has the option of retrying one or two times, or returning "service
not happy" to the outside calling app.
When I have a problem in my system, I want to find it and fix it. Ignoring
shard errors is ok as an option, and should be there. But, please do not make
it the default. Hiding failures should never be the default.
> Return partial results when a connection to a shard is refused
> --------------------------------------------------------------
>
> Key: SOLR-1143
> URL: https://issues.apache.org/jira/browse/SOLR-1143
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Nicolas Dessaigne
> Fix For: 1.4
>
> Attachments: SOLR-1143.patch
>
>
> If any shard is down in a distributed search, a ConnectException it thrown.
> Here's a little patch that change this behaviour: if we can't connect to a
> shard (ConnectException), we get partial results from the active shards. As
> for TimeOut parameter (https://issues.apache.org/jira/browse/SOLR-502), we
> set the parameter "partialResults" at true.
> This patch also adresses a problem expressed in the mailing list about a year
> ago
> (http://www.nabble.com/partialResults,-distributed-search---SOLR-502-td19002610.html)
> We have a use case that needs this behaviour and we would like to know your
> thougths about such a behaviour? Should it be the default behaviour for
> distributed search?
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