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From "Simon Willnauer (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3218) Make CFS appendable
Date Tue, 23 Aug 2011 08:22:29 GMT


Simon Willnauer updated LUCENE-3218:

    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:
>             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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