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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2793) Directory createOutput and openInput should take an IOContext
Date Fri, 03 Dec 2010 16:13:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966566#action_12966566
] 

Uwe Schindler commented on LUCENE-2793:
---------------------------------------

And MMapDir should return a simple/optimized direct FSIndexInput also. Because MMapping for
merging is just wasted resources/address space.

> 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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