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

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966564#action_12966564 ] 

Robert Muir commented on LUCENE-2793:
-------------------------------------

Sounds great, at least in theory we could do the DIRECT thing on windows too for this case.
and we can certainly give the sequential hint.

in general hints like this are probably good for custom dir impls too, we never know what they are doing
but its good to somehow inform them of our intentions so they have a chance to be optimal.


> 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
>
> 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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