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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140723#comment-14140723
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Shawn Heisey commented on LUCENE-5940:
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{quote}
also, "reindexing" comes in 2 distinct flavors:
* cold reindexing - rm -rf the index dir, re feed
** requires 2x hardware or downtime
* live reindexing - change config, restart system, re feed all docs, change is
"live" once all docs have been reindexed
** obviously a good idea to snapshot any previous index and config so you can
restore later on error
** minimal downtime (just restart)
** minimal search interruption (some queries related to the change may not
match old documents until reindex is complete)
** old content can be replaced slowly over time to receive full functionality
{quote}
I use Solr. My reindexing method is actually a combination of the two you've
mentioned. For every shard, I have a live core and a build core. When a
reindex is required, I start importing from my database into the build cores.
In the meantime, the live cores are still being updated once a minute with new
data and deletes. When the full import is done, I apply all relevant changes
to the build cores, then swap them with the live cores. Once that copy of my
index is rebuilt, I re-enable it so that the load balancer can use it again.
> 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.
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