FieldInfos should be read-only if loaded from disk
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Key: LUCENE-2983
URL: https://issues.apache.org/jira/browse/LUCENE-2983
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Affects Versions: 4.0
Reporter: Simon Willnauer
Assignee: Simon Willnauer
Priority: Minor
Fix For: 4.0
Currently FieldInfos create a private FieldNumberBiMap when they are loaded
from a directory which is necessary due to some limitation we need to face with
IW#addIndexes(Dir). If we add an index via a directory to an existing index
field number can conflict with the global field numbers in the IW receiving the
directories. Those field number conflicts will remain until those segments are
merged and we stabilize again based on the IW global field numbers. Yet, we
unnecessarily creating a BiMap here where we actually should enforce read-only
semantics since nobody should modify this FieldInfos instance we loaded from
the directory. If somebody needs to get a modifiable copy they should simply
create a new one and all all FieldInfo instances to it.
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