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From Nathan Neulinger <>
Subject Re: /solr/admin/ping causing exceptions in log?
Date Mon, 28 Jul 2014 13:34:45 GMT
Thing is - I wouldn't expect any of the default options mentioned to change the behavior intermittently.

i.e. it's working for 95% of the health check requests, it's just the intermittent ones that
seem to be cut off... I'm 
inquiring with haproxy devs since it appears that at least one other person on #haproxy is
seeing the same behavior. 
Doesn't appear to be specific to solr.

-- Nathan

On 07/27/2014 10:44 PM, Shawn Heisey wrote:
> On 7/27/2014 7:23 PM, Nathan Neulinger wrote:
>> Unfortunately, doesn't look like this clears the symptom.
>> The ping is responding almost instantly every time. I've tried setting a
>> 15 second timeout on the check, with no change in occurences of the error.
>> Looking at a packet capture on the server side, there is a clear
>> distinction between working and failing/error-triggering connections.
>> It looks like in a "working" case, I see two packets immediately back to
>> back (one with header, and next a continuation with content) with no ack
>> in between, followed by ack, rst+ack, rst.
>> In the failing request, I see the GET request, acked, then the http/1.1
>> 200 Ok response from Solr, a single ack, and then an almost
>> instantaneous reset sent by the client.
>> I'm only seeing this on traffic to/from haproxy checks. If I do a simple:
>>      while [ true ]; do curl -s http://host:8983/solr/admin/ping; done
>> from the same box, that flood runs with generally 10-20ms request times
>> and zero errors.
> I won't claim to understand what's going on here, but it might be a
> matter of the haproxy options.  Here are the options I'm using in the
> "defaults" section of the config:
> defaults
>          log     global
>          mode    http
>          option  httplog
>          option  dontlognull
>          option  redispatch
>          option  abortonclose
>          option  http-server-close
>          option  http-pretend-keepalive
>          retries 1
>          maxconn 1024
>          timeout connect 1s
>          timeout client  5s
>          timeout server  30s
> One bit of information I came across when I first started setting
> haproxy up for Solr is that servlet containers like Jetty and Tomcat
> require the "http-pretend-keepalive" option to work properly.  Are you
> using this option?
> Thanks,
> Shawn

Nathan Neulinger             
Neulinger Consulting                   (573) 612-1412

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