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https://issues.apache.org/jira/browse/LUCENE-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-3218:
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Attachment: LUCENE-3218.patch
next iteration - seems close.
* moved CFW to o.a.l.store and made package private.
* added createCompoundOutput to Directory instead of passing OpenMode
* added write support to CompundFileDirectory
* Separately written file are appended during close if possible (no other file
is currently written directly to the CF). If files is locked append happens
once that file is closed.
* IW uses Directory methods only, addFile has been converted to Directory#copy
once thing which still bugs me is the setAbortCheck on CFDirectory.. I wonder
if we can solve that differently, ideas?
> Make CFS appendable
> ---------------------
>
> Key: LUCENE-3218
> URL: https://issues.apache.org/jira/browse/LUCENE-3218
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3218.patch, LUCENE-3218.patch
>
>
> Currently CFS is created once all files are written during a flush / merge.
> Once on disk the files are copied into the CFS format which is basically a
> unnecessary for some of the files. We can at any time write at least one file
> directly into the CFS which can save a reasonable amount of IO. For instance
> stored fields could be written directly during indexing and during a Codec
> Flush one of the written files can be appended directly. This optimization is
> a nice sideeffect for lucene indexing itself but more important for DocValues
> and LUCENE-3216 we could transparently pack per field files into a single
> file only for docvalues without changing any code once LUCENE-3216 is
> resolved.
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