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From "Varun Thacker (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7820) IndexFetcher should delete the current index directory before downloading the new index when isFullCopyNeeded==true
Date Sat, 25 Jul 2015 14:31:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641637#comment-14641637
] 

Varun Thacker commented on SOLR-7820:
-------------------------------------

bq. was synchronizing commits across replicas, since recovery skips segments already present
in the current index. 

SOLR-6606 is the Jira.

> IndexFetcher should delete the current index directory before downloading the new index
when isFullCopyNeeded==true
> -------------------------------------------------------------------------------------------------------------------
>
>                 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 It's clearly out-of-date and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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