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From "Simon Willnauer (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3218) Make CFS appendable
Date Tue, 21 Jun 2011 15:17:47 GMT


Simon Willnauer updated LUCENE-3218:

    Attachment: LUCENE-3218.patch

final patch. 
* fixed javadocs + several javadoc warnings
* renamed openCompoundOutput to createCompoundOutput
* fixed file extensions in test CSF LOL!!
* copyFileEntry now deletes files that are separately written once copied into the CFS.
* converted asserts to exceptions in CFW

I plan to commit this today if nobody objects.

> Make CFS appendable  
> ---------------------
>                 Key: LUCENE-3218
>                 URL:
>             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, 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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