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From Jan Høydahl (JIRA) <>
Subject [jira] [Commented] (LUCENE-8264) Allow an option to rewrite all segments
Date Mon, 14 May 2018 13:03:00 GMT


Jan Høydahl commented on LUCENE-8264:

[~erickerickson] check out SOLR-10046 which seems to do what you want in <2> through
{{UninvertDocValuesMergePolicyFactory }}already, or do I misunderstand?

> Allow an option to rewrite all segments
> ---------------------------------------
>                 Key: LUCENE-8264
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Erick Erickson
>            Assignee: Erick Erickson
>            Priority: Major
> For the background, see SOLR-12259.
> There are several use-cases that would be much easier, especially during upgrades, if
we could specify that all segments get rewritten. 
> One example: Upgrading 5x->6x->7x. When segments are merged, they're rewritten
into the current format. However, there's no guarantee that a particular segment _ever_ gets
merged so the 6x-7x upgrade won't necessarily be successful.
> How many merge policies support this is an open question. I propose to start with TMP
and raise other JIRAs as necessary for other merge policies.
> So far the usual response has been "re-index from scratch", but that's increasingly difficult
as systems get larger.

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