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https://issues.apache.org/jira/browse/LUCENE-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041225#comment-13041225
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Michael McCandless commented on LUCENE-2793:
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bq. Some kind of a copy-on-write builder pattern
Why not use a normal struct/bean like class here?
bq. I wonder if it makes sense to bind the IO Context instance to the directory
and add a factory to the directory like
Directory#getIOContext(Merge|Search|Index) to enable the directory impl to set
platform specific defaults
Hmm, but, if the IOCtxt is 'high level', and then details (bufferSize,
seq/direct flags, etc.) are private to the dir impl, I think we (Lucene) can
create the IOCtx and pass it down? Ie this is a one-way communication, I think
(Lucene -> Dir impl).
> Directory createOutput and openInput should take an IOContext
> -------------------------------------------------------------
>
> Key: LUCENE-2793
> URL: https://issues.apache.org/jira/browse/LUCENE-2793
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Assignee: Simon Willnauer
> Labels: gsoc2011, lucene-gsoc-11, mentor
> Attachments: LUCENE-2793.patch, LUCENE-2793.patch, LUCENE-2793.patch
>
>
> Today for merging we pass down a larger readBufferSize than for searching
> because we get better performance.
> I think we should generalize this to a class (IOContext), which would hold
> the buffer size, but then could hold other flags like DIRECT (bypass OS's
> buffer cache), SEQUENTIAL, etc.
> Then, we can make the DirectIOLinuxDirectory fully usable because we would
> only use DIRECT/SEQUENTIAL during merging.
> This will require fixing how IW pools readers, so that a reader opened for
> merging is not then used for searching, and vice/versa. Really, it's only
> all the open file handles that need to be different -- we could in theory
> share del docs, norms, etc, if that were somehow possible.
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