Hoss Man created SOLR-4190:
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Summary: Add utility class for getting information about
suspicious system concerns at runtime
Key: SOLR-4190
URL: https://issues.apache.org/jira/browse/SOLR-4190
Project: Solr
Issue Type: Improvement
Reporter: Hoss Man
(Inspired by an idea Uwe mentioned in LUCENE-4630)
Over the years, we've discovered various bugs in JVMs, specific JVM options,
combinations of JVM options, combinations of JVMs and operating systems, etc...
We've done a fairly decent job of alerting users to these known issues in
documentation, and we've attempted to make tests not give false failures if
people use these setups -- but there is probably more we could be doing to
alert users who may not run tests, or read all the docs/blogs.
I think we should add a new class to Lucene Core that provides a simple API for
applications to get a list of "warning" Strings based on what lucene can dedect
from the currently running JVM/OS. This should be something trivial for people
writing apps using lucene to integrate into their code and/or tests (even if
they don't use the LuceneTestCase) to notify them if when there are known
compatibility issues between their enviornment and the version of lucene this
class ships with.
This code should be executed, and all of the resulting warning messages
outputed by...
* the CheckIndex command line mode on startup
* the Lucene Demo app(s) on startup
* infostream (if used) the first time it's configured on an IndexWriterConfig
* Solr startup logs
* Solr admin UI (as exposed by the Solr SystemInfoRequestHandler HTTP API)
* in the Lucene test framework after any test runs
...in addition, specific logic/messages in this code could help implement the
annotations Dawid is suggesting in LUCENE-4630.
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