Erick Erickson created LUCENE-8264:
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Summary: Allow an option to rewrite all segments
Key: LUCENE-8264
URL: https://issues.apache.org/jira/browse/LUCENE-8264
Project: Lucene - Core
Issue Type: Improvement
Reporter: Erick Erickson
Assignee: Erick Erickson
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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