[jira] Commented: (LUCENE-2073) Document issues involved in building your index with one jdk version and then searching/updating with another

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778547#action_12778547 ] 

Robert Muir commented on LUCENE-2073:
-------------------------------------

Mark, I agree, there are two issues I know of:

* using a new java version can change unicode version, which changes character properties, which makes things tokenize differently.
* using a different default locale can change at least some things in contrib, for example PatternAnalyzer uses a Locale-based toLowerCase() method, which will break if default locale is different between index and search.

... <other things you can think of>


> Document issues involved in building your index with one jdk version and then searching/updating with another
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2073
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2073
>             Project: Lucene - Java
>          Issue Type: Task
>            Reporter: Mark Miller
>
> I think this needs to go in something of a permenant spot - this isn't a one time release type issues - its going to present over multiple release.
> {quote}
> If there is nothing we can do here, then we just have to do the best we can -
> such as a prominent notice alerting that if you transition JVM's between building and searching the index and you are using or doing X, things will break.
> We should put this in a spot that is always pretty visible - perhaps even a new readme file titlted something like IndexBackwardCompatibility or something, to which we can add other tips and gotchyas as they come up. Or MaintainingIndicesAcrossVersions, or FancyWhateverGetsYourAttentionAboutUpgradingStuff. Or a permanent entry/sticky entry at the top of Changes.
> {quote}

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