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https://issues.apache.org/jira/browse/SOLR-13446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16835012#comment-16835012
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Shawn Heisey commented on SOLR-13446:
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Thanks, for your opinion, [~gerlowskija]!
I'm a little torn on changing the default also. But if it's coded well, I
think letting Java set the heap size would be a good option. And anytime Java
does choose the heap size, we need a log entry informing the user that it
wasn't explicitly set -- because I would not want to have somebody go into
production that way without really knowing that's what they're doing.
Even if we stick with a hardcoded default, I absolutely want to have something
in the log as discussed, with a configurable threshold, and we'll need to
decide where to set that threshold default. As mentioned, I think 2GB is a
good starting point. And we probably ought to log something short, one line,
at INFO if they're above the threshold.
Here's more detail to the nuts and bolts I was thinking about: Write a tiny
java program that can be executed by the start script, which writes a shell (or
cmd) include file in a temp directory with data that the start script can load
before starting Solr. I'm thinking that we call this little program
solr-agent, and it can be a precursor to the ideas in SOLR-6733 and SOLR-6734.
I need to do some experiments to determine whether or not Java and our start
scripts can detect when there is not enough actual memory to satisfy the heap
allocation.
> Improve default heap size and related handling
> ----------------------------------------------
>
> Key: SOLR-13446
> URL: https://issues.apache.org/jira/browse/SOLR-13446
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: scripts and tools
> Affects Versions: 8.0
> Reporter: Shawn Heisey
> Priority: Minor
>
> Solr's scripts have a default max heap setting of 512MB. I think it's fair
> to say that for a production install, this is ridiculously small. Nearly
> everyone who runs a Solr server will need to increase this value.
> I think it would be useful to issue a warning in the log when the heap size
> is below a certain value. Text like "Detected max heap size is XXXX. It
> might be necessary to increase the heap size for proper operation. See
> https://lucene.apache.org/solr/path/to/ref/guide/location for details."
> For people who are running very small servers, there should be a config
> option to turn off that logging when somebody knows that the default heap
> size is perfectly fine for their setup.
> At the same time, we also need to improve the default heap size. I'm going
> to ask everyone to bikeshed about what the new default should be. Initial
> thought is a 2GB default, to be made smaller automatically if detected system
> memory is low. If the admin has explicitly set the heap size, then none of
> this will take place.
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