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Simon Willnauer resolved LUCENE-9669. ------------------------------------- Resolution: Fixed > N-2 compatibility for file formats > ---------------------------------- > > Key: LUCENE-9669 > URL: https://issues.apache.org/jira/browse/LUCENE-9669 > Project: Lucene - Core > Issue Type: Improvement > Reporter: Simon Willnauer > Assignee: Simon Willnauer > Priority: Major > Fix For: master (9.0) > > Time Spent: 3.5h > Remaining Estimate: 0h > > Currently Lucene supports reading and writing indices that have been > created with the current or previous (N-1) version of Lucene. Lucene > refuses to open an index created by N-2 or earlier versions. > I would like to propose that Lucene adds support for opening indices > created by version N-2 in read-only mode. Here's what I have in mind: > - Read-only support. You can open a reader on an index created by > version N-2, but you cannot open an IndexWriter on it, meaning that > you can neither delete, update, add documents or force-merge N-2 > indices. > - File-format compatibility only. File-format compatibility enables > reading the content of old indices, but not more. Everything that is > done on top of file formats like analysis or the encoding of length > normalization factors is not guaranteed and only supported on a > best-effort basis. > The reason I came up with these limitations is because I wanted to > make the scope minimal in order to retain Lucene's ability to move > forward. If there is consensus to move forward with this, I would like > to target Lucene 9.0 with this change. > This is a follow-up of the mailinglist thread > [here|http://mail-archives.apache.org/mod_mbox/lucene-dev/202101.mbox/%3ccaahmpkg1bd9rtmvfr4jweygyaxwz5osy1hv9ubzks0fhsfn...@mail.gmail.com%3E] > -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org