Store DocValues per segment instead of per field
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Key: LUCENE-3216
URL: https://issues.apache.org/jira/browse/LUCENE-3216
Project: Lucene - Java
Issue Type: Improvement
Components: core/index
Affects Versions: 4.0
Reporter: Simon Willnauer
Fix For: 4.0
currently we are storing docvalues per field which results in at least one file
per field that uses docvalues (or at most two per field per segment depending
on the impl.). Yet, we should try to by default pack docvalues into a single
file if possible. To enable this we need to hold all docvalues in memory during
indexing and write them to disk once we flush a segment.
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