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Posted to dev@lucene.apache.org by "Robert Krüger (JIRA)" <ji...@apache.org> on 2015/12/10 13:56:11 UTC
[jira] [Commented] (SOLR-5043) hostanme lookup in SystemInfoHandler
should be refactored to not block core (re)load
[ https://issues.apache.org/jira/browse/SOLR-5043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15050937#comment-15050937 ]
Robert Krüger commented on SOLR-5043:
-------------------------------------
Is anyone planning on scheduling this for an upcoming release? The proposed solution unfortunately is beyond my solr-knowledge, so I probably won't send a patch.
> hostanme lookup in SystemInfoHandler should be refactored to not block core (re)load
> ------------------------------------------------------------------------------------
>
> Key: SOLR-5043
> URL: https://issues.apache.org/jira/browse/SOLR-5043
> Project: Solr
> Issue Type: Improvement
> Reporter: Hoss Man
> Attachments: SOLR-5043-lazy.patch, SOLR-5043.patch
>
>
> SystemInfoHandler currently lookups the hostname of the machine on it's init, and caches for it's lifecycle -- there is a comment to the effect that the reason for this is because on some machines (notably ones with wacky DNS settings) looking up the hostname can take a long ass time in some JVMs...
> {noformat}
> // on some platforms, resolving canonical hostname can cause the thread
> // to block for several seconds if nameservices aren't available
> // so resolve this once per handler instance
> //(ie: not static, so core reload will refresh)
> {noformat}
> But as we move forward with a lot more multi-core, solr-cloud, dynamically updated instances, even paying this cost per core-reload is expensive.
> we should refactoring this so that SystemInfoHandler instances init immediately, with some kind of lazy loading of the hostname info in a background thread, (especially since hte only real point of having that info here is for UI use so you cna keep track of what machine you are looking at)
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