I actually narrowed this down to changing the schema version from 1.5 to 1.6 
and then doing a RELOADCOLLECTION, it consistently hangs.  Several of our nodes 
go briefly into a recovering state too.
________________________________
From: Karl Stoney <karl.sto...@autotrader.co.uk.INVALID>
Sent: 13 February 2020 09:49
To: solr-user@lucene.apache.org <solr-user@lucene.apache.org>
Subject: Re: Async RELOADCOLLECTION never completes

When performing a rolling restart we see:

09:43:31.890 
[OverseerThreadFactory-42-thread-5-processing-n:solr-5.search-solr.prod.k8.atcloud.io:80_solr]
 ERROR org.apache.solr.cloud.OverseerTaskProcessor - 
:org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode 
= Session expired for /overseer/collection-map-failure

Which I find interesting, everything (resources wise) is very healthy.

On 13/02/2020, 09:34, "Karl Stoney" <karl.sto...@autotrader.co.uk.INVALID> 
wrote:

    Hi,
    We’re periodically seeing an ASYNC task to RELOADCOLLECTION never complete, 
it’s just permanently “running”:

    ❯ curl -s 
https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsolr.search-solr.prod.k8.atcloud.io%2Fsolr%2Fadmin%2Fcollections&amp;data=02%7C01%7Ckarl.stoney%40autotrader.co.uk%7C7a5d7c308dac49b5ab3408d7b06a0ff3%7C926f3743f3d24b8a816818cfcbe776fe%7C0%7C0%7C637171841881478917&amp;sdata=fjl0QkOCCanmgUHAXX%2F5HvzBcexCmugLItWNIzG1D%2Fc%3D&amp;reserved=0\?action\=REQUESTSTATUS\&requestid\=1581585716
 | jq .
    {
      "responseHeader": {
        "status": 0,
        "QTime": 2
      },
      "status": {
        "state": "running",
        "msg": "found [1581585716] in running tasks"
      }
    }

    The collection appears to have been reloaded fine (from the gui, it’s using 
the right config), so we’re a bit baffled.

    The only way I’ve found to clear this up is to rolling restart solr.

    Solr 8.4.1

    Any ideas?
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