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https://issues.apache.org/jira/browse/SOLR-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533206#comment-13533206
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Shawn Heisey commented on SOLR-4194:
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I still cannot figure out what happened to break it, but I have some more
information. It appears to be the qt.path parameter introduced by my patch on
SOLR-4143 that causes the current explosion. This patch was included before
when it was working, though.
If I change qt.path to qt, or any other garbage parameter, it works. This is
ironic because SOLR-4143 is designed to fix a problem with talking to the PRH
on Solr 3.5.0. It's also very weird, because only SolrJ is patched to
recognize the qt.path parameter. I didn't think that this would bleed through
to Solr, but it looks like I was wrong.
> PingRequestHandler - shards parameter inherited from search handler definition
> ------------------------------------------------------------------------------
>
> Key: SOLR-4194
> URL: https://issues.apache.org/jira/browse/SOLR-4194
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.1
> Environment: solr-impl 4.1-SNAPSHOT 1421496 - ncindex - 2012-12-13
> 14:56:25
> Reporter: Shawn Heisey
> Fix For: 4.1, 5.0
>
>
> Included in all my cores is a PingRequestHandler named /admin/ping, which I
> use to enable/disable the server from the perspective of a load balancer
> running haproxy. The handler includes a qt parameter set to /lbcheck.
> I have a special core defined (I call it a broker) that includes the shards
> parameter in most of its search handler definitions. This includes /select,
> /lbcheck, and others.
> When the /admin/ping handler is called, the query is sent to the /lbcheck
> parameter as expected, which gets distributed because it includes shards. If
> one of those shards happens to be down, the handler will give an error
> response to the load balancer.
> The problem is that the PingRequestHandler seems to inherit the shards
> parameter from the search handler it is using, which causes the /admin/ping
> request itself to be distributed, which is not what I want. The individual
> shards are not used by the load balancer, so they always remain disabled.
> This works perfectly in 3.5.0. The official 4.0.0 release has not been
> tested.
> Config and log data will follow in the comments.
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