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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
here is a rough patch against trunk that detaches CFDirectory from other dir
impls but still extends Directory. all optimizations still remain while always
the top-level directory is used to create / open the CFS.
I didn't follow uwes last approach since I could figure out when to close the
RAF reference since like in the MMap case we want to forcefully unmap the file
and therefor would also need to close the RAF reference in the base stream. I
use a helper construct (IndexInputHandle - yes need to find a better name) that
can only be pulled from another directory (protected). So this is private to
the directory impls but solves our cases here nicely I think.
still rough but its a start.
> 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: 3.4, 4.0
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3218.patch, 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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