Robert Muir created LUCENE-5991:
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Summary: add minor-revision writers to backwards-codecs
Key: LUCENE-5991
URL: https://issues.apache.org/jira/browse/LUCENE-5991
Project: Lucene - Core
Issue Type: Test
Reporter: Robert Muir
Today we have backwards testing almost completely isolated cleanly, and tests
against each format. But we only test old major formats, not the minor ones.
Before it was probably the right tradeoff, but now that its isolated I think we
should test all of them.
For example the 4.1 stored fields format had two minor format changes across
the 4.x release:
{noformat}
static final int VERSION_START = 0;
static final int VERSION_BIG_CHUNKS = 1;
static final int VERSION_CHECKSUM = 2;
static final int VERSION_CURRENT = VERSION_CHECKSUM;
{noformat}
We could easily directly test these possibilities (e.g. take this as a
parameter to the RW format and have 3 TestXXXStoredFieldsFormat, one for each)
instead of only testing the latest one and relying on TestBackCompat to find
issues, which it probably won't since the index is simplistic.
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