[ https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130131#comment-14130131 ]
Uwe Schindler commented on LUCENE-5940: --------------------------------------- bq. however, if product X released with lucene 4.88 and the last minor version in 4.x line was 4.99, then the upgrade process to get to a lucene 5.0 index is now convoluted and will require creation of custom offline tools to provide an upgrade path. the current policy does not have these issues since all that i would need to do is fire up the next version, do a forceMerge, and everything is up to date on latest codecs. (no offline processes required, search can continue to work during upgrade) We have a tool that does this without forceMerge. It just upgrades those segments that need upgrade and writes a new commit point. It is called IndexUpgrader and has a main method. My idea would be to privtde that tool, including all stuff as a self-executing JAR file, so you just need: {{java -jar lucene-indexupgrader-4.10.0.jar indexdir}} (basically it is already like that, but you need to build classpath and command line manually). > change index backwards compatibility policy. > -------------------------------------------- > > Key: LUCENE-5940 > URL: https://issues.apache.org/jira/browse/LUCENE-5940 > Project: Lucene - Core > Issue Type: Bug > Reporter: Robert Muir > > Currently, our index backwards compatibility is unmanageable. The length of > time in which we must support old indexes is simply too long. > The index back compat works like this: everyone wants it, but there are > frequently bugs, and when push comes to shove, its not a very sexy thing to > work on/fix, so its hard to get any help. > Currently our back compat "promise" is just a broken promise, because we > cannot actually guarantee it for these reasons. > I propose we scale back the length of time for which we must support old > indexes. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org