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https://issues.apache.org/jira/browse/LUCENE-7488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575263#comment-15575263
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Michael McCandless commented on LUCENE-7488:
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Isn't this a Solr issue, not a Lucene issue?
> Consider tracking modification time of external file fields for faster
> reloading
> --------------------------------------------------------------------------------
>
> Key: LUCENE-7488
> URL: https://issues.apache.org/jira/browse/LUCENE-7488
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> 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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