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https://issues.apache.org/jira/browse/SOLR-12386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17383710#comment-17383710
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Mark Robert Miller commented on SOLR-12386:
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{quote}Retries and attempts from everyone to create core zk nodes
{quote}
I should illustrate that a bit.
Lets say you start up 100 solr servers for a nice new cluster. Or an existing
cluster.
Generally, what is going to happen is that every Solr instance is going to hit
ZK and do something like, ensure /configs exists. And makePath on
/path1/path2/path3. Which may be 3 calls, just in case path1 and path2 don't
yet exist. So what essentially happens, is that all the time, we have 100 solr
servers try / retrying to make same paths, the same exisiting or about to exist
path parts, etc. So we do something like boot up a new cluster, and the zk base
layout could maybe created with, let's say, 15 zk calls. And maybe we make 900.
And 100's more on a restart for nodes that are created on day 1, instant 1.
Maybe we recreate nodes someone just tried to delete in this process. Since
independent things in lots of random places are trying to ensure nodes exist
(that should be one and done on first startup, or collection create, etc, maybe
you end up will all kinds of zk calls from all these servers even at random
times outside startup, restart, collection create. When you could simply have
one time instance of, create these dozen paths, one server says it, it's done,
case closed forever more.
> Test fails for "Can't find resource" for files in the _default configset
> ------------------------------------------------------------------------
>
> Key: SOLR-12386
> URL: https://issues.apache.org/jira/browse/SOLR-12386
> Project: Solr
> Issue Type: Test
> Components: SolrCloud
> Reporter: David Smiley
> Priority: Minor
> Attachments: cant find resource, stacktrace.txt
>
>
> Some tests, especially ConcurrentCreateRoutedAliasTest, have failed
> sporadically failed with the message "Can't find resource" pertaining to a
> file that is in the default ConfigSet yet mysteriously can't be found. This
> happens when a collection is being created that ultimately fails for this
> reason.
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