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From "Tomasz Czarnecki (JIRA)" <>
Subject [jira] [Created] (SOLR-10211) Solr UI crashes Solr server somtimes by repeating long requests
Date Tue, 28 Feb 2017 11:56:45 GMT
Tomasz Czarnecki created SOLR-10211:

             Summary: Solr UI crashes Solr server somtimes by repeating long requests
                 Key: SOLR-10211
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: Admin UI
    Affects Versions: 6.3
         Environment: Linux Debian7, Firefox 51.0.1
            Reporter: Tomasz Czarnecki

As I can observe the behavior od the new UI is as follows:
- If request takes to long
- Pop up red "Connection to Solr lost" message.
- Try to repeat last request every few seconds to recover.

As this tactic may seem OK for real connection problems it may do a lot of harm if request
takes long because it's heavy.

I have had two such scenarios.
1. Loading Schema (e.g. /#/collection1/schema). For big index this can require a a lot of
memory initially. And it can take 20-30 seconds. But if such operation is repeated several
times in a series is short time frame, resource requirements add up and this results in OOM
exception on server side.
The workaround is to:
- Try to load schema
- If red red "Connection to Solr lost" message pops up close Solr UI browser tab.
- Wait a about minute for server to warm up.
- Open a new Solr UI tab and load schema again, this time it works fast enough, probably to
next index update.

2. Occasionally we use "optimize now" functionality. This can take a while for some collections
(~100GB, 10M docs). If such request is repeated over longer period of time a whole Jetty thread
pool can be exhausted leaving Solr unresponsive to any requests.
It's as easy as starting optimize and leaving your screen for 15 minutes with "Connection
to Solr lost" message present.

Observed on our few Solr instances after migration from 5.3 to 6.3.

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