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https://issues.apache.org/jira/browse/SOLR-7820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643311#comment-14643311
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Mark Miller commented on SOLR-7820:
-----------------------------------
bq. although I've heard having too large of a threshold has its own set of
issues.
Hopefully that has been heavily mitigated by other improvements (like streaming
updates). I never remember the full issue though - [[email protected]] always
has to remind me. I think RAM usage was perhaps the other major concern, but
that's all about doc size and the RAM you have - more a default issue than
anything.
> IndexFetcher should calculate ahead of time how much space is needed for full
> snapshot based recovery and cleanly abort instead of trying and running out
> of space on a node
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-7820
> URL: https://issues.apache.org/jira/browse/SOLR-7820
> Project: Solr
> Issue Type: Improvement
> Components: replication (java)
> Reporter: Timothy Potter
>
> When a replica is trying to recover and it's IndexFetcher decides it needs to
> pull the full index from a peer (isFullCopyNeeded == true), then the existing
> index directory should be deleted before the full copy is started to free up
> disk to pull a fresh index, otherwise the server will potentially need 2x the
> disk space (old + incoming new). Currently, the IndexFetcher removes the
> index directory after the new is downloaded; however, once the fetcher
> decides a full copy is needed, what is the value of the existing index? It's
> clearly out-of-date and should not serve queries. Since we're deleting data
> preemptively, maybe this should be an advanced configuration property, only
> to be used by those that are disk-space constrained (which I'm seeing more
> and more with people deploying high-end SSDs - they typically don't have 2x
> the disk capacity required by an index).
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