If index is pre-3.0 IndexWriter does not fail on open
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Key: LUCENE-2552
URL: https://issues.apache.org/jira/browse/LUCENE-2552
Project: Lucene - Java
Issue Type: Sub-task
Components: Index
Reporter: Uwe Schindler
Priority: Minor
Fix For: 3.1, 4.0
IndexReader.open() fails for all old pre-3.0 indexes in Lucene trunk. This is
tested by TestBackwardCompatibility. On the other hand, IndexWriter's ctor does
not fail on open an existing index, that contains an old segment, because it
does not check preexisting segments. It only throws IndexFormatTooOldException,
if you merge segments or open a getReader(). When ConcurrentMergeScheduler is
used, this may happen in an foreign thread which makes it even worse.
Mike and me propose:
- In 3.x introduce a new segments file format when committing, that contains
the oldest and newest version of the index segments (not sure which version
number to take here), this file format has new version, so its easy to detect
(DefaultSegmentsFileWriter/Reader)
- In trunk when opening IndexWriter check the following: If segments file is in
new format, check minimum version from this file, if pre-3.0 throw IFTOE; if
segments file is in old format (can be 3.0 or 3.x index not yet updated), try
to open FieldsReader, as 2.9 indexes only can be detected using this - older
indexes should fail before and never come to that place. If this succeeds,
write a new segments file in new format (maybe after commit or whatever)
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