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https://issues.apache.org/jira/browse/SOLR-9651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583004#comment-15583004
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Mike commented on SOLR-9651:
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I haven't read the super long SOLR-5944 issue, but the one thing I'll say about
external file fields that's wonderful is that they can be updated in a flash.
For a database with millions of documents, I can update them all just by
updating a single file. That's very powerful and it'd be a shame if EFF were
deprecated and I had to send a gazillion update queries to Solr to do the same.
> Consider tracking modification time of external file fields for faster
> reloading
> --------------------------------------------------------------------------------
>
> Key: SOLR-9651
> URL: https://issues.apache.org/jira/browse/SOLR-9651
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 4.10.4
> Environment: Linux
> Reporter: Mike
>
> I have an index of about 4M legal documents that has pagerank boosting
> configured as an external file field. The external file is about 100MB in
> size and has one row per document in the index. Each row indicates the
> pagerank score of a document. When we open new searchers, this file has to
> get reloaded, and it creates a noticeable delay for our users -- takes
> several seconds to reload.
> An idea to fix this came up in [a recent discussion in the Solr mailing
> list|https://www.mail-archive.com/solr-user@lucene.apache.org/msg125521.html]:
> Could the file only be reloaded if it has changed on disk? In other words,
> when new searchers are opened, could they check the modtime of the file, and
> avoid reloading it if the file hasn't changed?
> In our configuration, this would be a big improvement. We only change the
> pagerank file once/week because computing it is intensive and new documents
> don't tend to have a big impact. At the same time, because we're regularly
> adding new documents, we do hundreds of commits per day, all of which have a
> delay as the (largish) external file field is reloaded.
> Is this a reasonable improvement to request?
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