updateLog tlog directory config silently ignored (SOLR-16962)

[Michael Gibney]

I'd like to call some extra attention to SOLR-16962 [1]. I'm fairly
certain that it's been years since it has actually worked to specify
tlog dir in solrconfig.xml `` element. I've opened a PR
that fixes this, but it involves making some decisions about edge-case
handling, for which I'd appreciate feedback.

Of course, if anyone _has_ successfully configured a custom tlog dir
location with a recent solr version, I'd be curious to hear about that
too!

Also worth mentioning: if anyone currently has this latently
configured in solrconfig.xml, I wonder if it's possible that fixing
this bug could cause a change in behavior that might cause a
backcompat issue.

[1] https://issues.apache.org/jira/browse/SOLR-16962

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Future of the cross-dc work

[Houston Putman]

Hey everyone,

I think it's a good time to talk about the future of the cross DC work
that's been going on in the Solr Sandbox repo.

Mark (and others) have been doing amazing work there, and I think it's
close to a state that we can bring it out of the sandbox and into Solr
itself. It's been running successfully in Apple, and moving it into Solr
would allow others to use and collaborate on it easier.

There are two parts to this cross DC tool.

   - A cross-dc-producer
   ,
   which is a Solr plugin that has a Update-request-processor that adds
   documents to a Kafka Queue to be indexed asynchronously.
   - A cross-dc-consumer
   ,
   which is a separate application that handles consuming documents from Kafka
   and sending it to Solr to be indexed.

In my mind, I envision when we move the cross-dc-consumer into the Solr
codebase, it would live much like the Prometheus Exporter. Where it's
released as a part of the same binary package, but not in the slim
distribution.

As for the cross-dc-producer, that can live as a Solr module, much like the
other modules that Solr ships with. Once again, this would not be included
with the Slim distribution.

This ties the cross-dc packages to specific Solr versions, much like other
Modules or SolrJ. I think this is an acceptable thing, but others might
want it to be more version agnostic or have a separate release schedule
from Solr.

Overall this thread is to just get the conversation started so that we can
throw all the ideas out there before we make a decision on one.

- Houston

I'm going to ASF Community-over-Code in Halifax

[David Smiley]

Just an FYI that I'll be at the ASF Community-over-Code conference in
Halifax this October.  I hope to see some of you there!

~ David