rmuir commented on a change in pull request #572:
URL: https://github.com/apache/lucene/pull/572#discussion_r775699604
##########
File path: lucene/core/src/java/org/apache/lucene/store/MMapDirectory.java
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@@ -343,6 +344,9 @@ private IOException convertMapFailedIOException(
CLEANER = null;
UNMAP_SUPPORTED = false;
UNMAP_NOT_SUPPORTED_REASON = hack.toString();
+ Logger.getLogger(MMapDirectory.class.getName())
+ .warning(
+ "Use of MMapDirectory was disabled by default:
".concat(UNMAP_NOT_SUPPORTED_REASON));
Review comment:
I think this is confusing to say 'MMAPDirectory was disabled' from
`MMapDirectory` class? This class still functions correctly, it just won't
forcibly unmap(), kernel resources may be wasted because GC has not decided
they were important, etc. Still probably just fine for a static index.
It is `FSDirectory` class that instead chooses a different default for
`FSDirectory.open` based on whether unmap() is
supported and the platform is 64-bits. So I would prefer to log
"enabled/disabled" from that class?
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