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https://issues.apache.org/jira/browse/SOLR-13457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836612#comment-16836612
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Gus Heck commented on SOLR-13457:
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Also as I think about this more, we may need an additional type for solrj
client timeout settings, and since solrj is used in core, something fancy to
distinguish the two cases.
> Managing Timeout values in Solr
> -------------------------------
>
> Key: SOLR-13457
> URL: https://issues.apache.org/jira/browse/SOLR-13457
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: master (9.0)
> Reporter: Gus Heck
> Priority: Major
>
> Presently, Solr has a variety of timeouts for various connections or
> operations. These timeouts have been added, tweaked and refined and in some
> cases made configurable in an ad-hoc manner by the contributors of individual
> features. Throughout the history of the project. This is all well and good
> until one experiences a timeout during an otherwise valid use case and needs
> to adjust it.
> This has also made managing timeouts in unit tests "interesting" as noted in
> SOLR-13389.
> Probably nobody has the spare time to do a tour de force through the code and
> coordinate every single timeout, so in this ticket I'd like to establish a
> framework for categorizing time outs, a standard for how we make each
> category configurable, and then add sub-tickets to address individual
> timeouts.
> The intention is that eventually, there will be no "magic number" timeout
> values in code, and one can predict where to find the configuration for a
> timeout by determining it's category.
> Initial strawman categories (feel free to knock down or suggest alternatives):
> # *Feature-Instance Timeout*: Timeouts that relate to a particular
> instantiation of a feature, for example a database connection timeout for a
> connection to a particular database by DIH. These should be set in the
> configuration of that instance.
> # *Optional Feature Timeout*: A timeout that only has meaning in the context
> of a particular feature that is not required for solr to function... i.e.
> something that can be turned on or off. Perhaps a timeout for communication
> with an external ldap for authentication purposes. These should be configured
> in the same configuration that enables this feature.
> # *Global System Timeout*: A timeout that will always be an active part of
> Solr these should be configured in a new <timeouts> section of solr.xml. For
> example the Jetty thread idle timeout, or the default timeout for http calls
> between nodes.
> # *Node Specific Timeout*: A timeout which may differ on different nodes. I
> don't know of any of these, but I'll grant the possibility. These (and only
> these) should be set by setting system properties. If we don't have any of
> these, that's just fine :).
> *Note that in no case is a hard-coded value the correct solution.*
> If we get a consensus on categories and their locations, then the next step
> is to begin adding sub tickets to bring specific timeouts into compliance.
> Every such ticket should include an update to the section of the ref guide
> documenting the configuration to which the timeout has been added (e.g. docs
> for solr.xml for Global System Timeouts) describing what exactly is affected
> by the timeout, the maximum allowed value and how zero and negative numbers
> are handled.
> It is of course true that some of these values will have the potential to
> destroy system performance or integrity, and that should be mentioned in the
> update to documentation.
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