Make CFS appendable
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Key: LUCENE-3218
URL: https://issues.apache.org/jira/browse/LUCENE-3218
Project: Lucene - Java
Issue Type: Improvement
Components: core/index
Affects Versions: 4.0
Reporter: Simon Willnauer
Fix For: 4.0
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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