[jira] [Assigned] (LUCENE-2793) Directory createOutput and openInput should take an IOContext

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer reassigned LUCENE-2793:
---------------------------------------

    Assignee: Simon Willnauer

> 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: Store
>            Reporter: Michael McCandless
>            Assignee: Simon Willnauer
>              Labels: gsoc2011, lucene-gsoc-11, mentor
>         Attachments: 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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