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From "Varun Thacker (JIRA)" <>
Subject [jira] [Updated] (LUCENE-2793) Directory createOutput and openInput should take an IOContext
Date Thu, 02 Jun 2011 14:28:48 GMT


Varun Thacker updated LUCENE-2793:

    Attachment: LUCENE-2793.patch

I have edited and org.apache.index where needed. If this is correct
I'll change the codecs too

> Directory createOutput and openInput should take an IOContext
> -------------------------------------------------------------
>                 Key: LUCENE-2793
>                 URL:
>             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, 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,
> 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

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