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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
* removed 3.4 support for the current format (cfe file) in SI
* regenerated the BW test indices (not in the patch)
* add javadoc for IndexInputHandle
* added IndexInputHandle#openFullSlice to get a slice spanning the entire file.
* Track indexInputHandle instances in MockDirectoryWrapper to ensure they are
closed.
* Use the IndexInputHandle ie. the underlying file handle to create all streams
in CFS (uwes suggestion - thanks for that)
I didn't include the generated indices for bw tests in the patch for size /
readability. Yet, if you want to run the tests you need to generate them
otherwise TestBackwardsCompatibility will fail.
this seems close, the question is if we want to backport this to 3.x too?
> 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.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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