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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2011/08/20 11:10:27 UTC
[jira] [Updated] (LUCENE-3218) Make CFS appendable
[ https://issues.apache.org/jira/browse/LUCENE-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir updated LUCENE-3218:
--------------------------------
Priority: Blocker (was: Major)
Affects Version/s: 3.4
> 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
> Assignee: 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_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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