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https://issues.apache.org/jira/browse/SOLR-7667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584105#comment-14584105
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Hoss Man commented on SOLR-7667:
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bq. I'm a fan of the "fail fast and fail hard" approach.
While I share this philosophy in general, it's doesn't really make sense here...
Consider specifically how a system can get in a situation like this:
* a completley new solr install, with no cores/collections
* user configures transientSize=2
* user adds 2 cores which are loadOnStartup=true. everything is happy
* user adds some more cores which are loadOnStartup=false. everything is still
happy. the transient cache has automatically closes/opens cores as needed
* user restarts solr. everything is still happy - the 2 loadOnStartup=true
cores are loaded.
* as requests come in, the transient cache closes/opens cores as needed
* a user adds 1 more new loadOnStartup=true core. everything is still happy
* as requests come in, the transient cache closes/opens cores as needed
* user restarts solr -- suddenly, solr complains about a configuration error
... WTF? the configuration hasn't changed? Solr was operating just fine before
restart, now it says transientSize is too small for the number of cores i have?
WTF?!?!?!
...the philosophy of "fail fast and fail hard" just doesn't apply here --
unless you're going to fail fast and hard in the CoreAdmin and not even let a
new core be created with loadOnStartup=true unless you count all the
loadOnStartup=true cores (even the ones that may not currently be loaded due to
either the trnasient cache or due to the user explicitly closing them).
----
I think the only sane behavior here is that if transientSize is used, the Core
discovery should prioritize initializing loadOnStartup=true cores and if there
are more of those then the transientSize=N, it should just pick N to load and
log a warning about: "Core foo not initialized even though it is
loadOnStartup=true because transientSize=N exceeded."
> If more cores are loaded at startup than the transient core size, cores
> become unavailable.
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-7667
> URL: https://issues.apache.org/jira/browse/SOLR-7667
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.2.1, Trunk
> Reporter: Erick Erickson
> Assignee: Erick Erickson
>
> Edwin Lee from the user's list caught this, the original post is titled
> "loadOnStartup & transientCoreSize & BUG Report on CoreContainer.java"
> Nice catch Edwin!
> More details to follow:
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