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From "Varun Thacker (JIRA)" <>
Subject [jira] [Commented] (SOLR-11920) Differential file copy for IndexFetcher
Date Sat, 27 Jan 2018 22:57:00 GMT


Varun Thacker commented on SOLR-11920:

+1 to the idea.


Restore Core does a local copy instead of the hard link approach that you're proposing in
this patch. I haven't looked up if hard link is the right approach but if it is we could do
something similar in restore as well. 



Maybe we should turn the two INFO log lines into DEBUG? I know they are currently INFO as
well but seems like we should change it
 #"Don't need to download this ... 
 # {{"Skipping download for ... }}

> Differential file copy for IndexFetcher
> ---------------------------------------
>                 Key: SOLR-11920
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Ishan Chattopadhyaya
>            Priority: Major
>         Attachments: SOLR-11920.patch, SOLR-11920.patch
> In the case of fullCopy=true, all files are copied over from the leader/master irrespective
of whether or not that exact file exists with the replica/slave. This is wasteful, esp. in
tlog replicas or pull replicas, when only a fraction of the total files are different.
> This stems from SOLR-11815.

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