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https://issues.apache.org/jira/browse/LUCENE-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087702#comment-13087702
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Simon Willnauer commented on LUCENE-3218:
-----------------------------------------
bq. We did this because previously the CFS stored the header in the front of
the file (I think)?
is this really the problem here? I mean this problem is in FileSwitch / NRT
Directory. The CFS uses a directory to write files, I would expect that if we
use for instance NRT directory it gets the NRT directory instead of either of
of its sub directories. its not really a CFS problem IMO and we should rather
fix the actual directory rather than reverting the small optimization having
the header in a separate file. i think we should prevent the seek if not
absolutely necessary.
> 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: 3.4, 4.0
>
> Attachments: LUCENE-3218.patch, LUCENE-3218.patch, LUCENE-3218.patch,
> LUCENE-3218.patch, LUCENE-3218_3x.patch, LUCENE-3218_test_fix.patch,
> LUCENE-3218_tests.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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