Robert Muir created LUCENE-4364:
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Summary: MMapDirectory makes too many maps for CFS
Key: LUCENE-4364
URL: https://issues.apache.org/jira/browse/LUCENE-4364
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
Attachments: LUCENE-4364.patch
While looking at LUCENE-4123, i thought about this:
I don't like how mmap creates a separate mapping for each CFS slice, to me this
is way too many mmapings.
Instead I think its slicer should map the .CFS file, and then when asked for an
offset+length slice of that, it should be using .duplicate()d buffers of that
single master mapping.
then when you close the .CFS it closes that one mapping.
this is probably too scary for 4.0, we should take our time, but I think we
should do it.
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