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https://issues.apache.org/jira/browse/SOLR-7576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661214#comment-14661214
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David Smiley commented on SOLR-7576:
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I think the pain point here that Upayavira is getting at, and which I see, is
the annoyance of having to update a file in ZooKeeper from one's file system.
In stand-alone, there is no extra step between saving certain types of files in
a conf/ dir on your file system and utilizing it from Solr (perhaps also
needing a core reload or similar action). That file list includes script URPs
(JS and other interpreted languages supported), XSLTs, Velocity templates,
sometimes DIH config files considering the debug mode, and file based
Spellcheck & Suggester sources, and ExternalFileField's source file. Perhaps
there are others I have overlooked. To some extent we could say absolutely
everything in a conf/, but there are now RESTful APIs to modify various things
in ways that don't involve the need to update the schema or solrconfig.xml
directly.
What I'd love to see is a file system to ZooKeeper updater that works
automatically once something is saved. This might be a utility tool only used
in development, or perhaps built-in to bin/solr -- either way it'd be super
helpful.
> Implement RequestHandler in Javascript
> --------------------------------------
>
> Key: SOLR-7576
> URL: https://issues.apache.org/jira/browse/SOLR-7576
> Project: Solr
> Issue Type: New Feature
> Reporter: Noble Paul
> Attachments: SOLR-7576.patch, SOLR-7576.patch
>
>
> Solr now support dynamic loading (SOLR-7073) of components and it is secured
> in SOLR-7126
> We can extend the same functionality with JS as well
> the handler {{/js}} is implicitly registered
> To make this work
> * Solr should be started with {{-Denable.js.loading=true}}
> * The javascript must be loaded to the {{.system}} collection using the blob
> store API
> * Sign the javascript and pass the signature in a param called {{_sig}}
> The {{JSRequestHandler}} is implicitly defined and it can be accessed by
> hitting {{/js/<jsname>/<version>}}
> Steps for developing scripts
> # start the cluster with the {{enable.js.loading}} . If you are starting
> using our script it would be {{bin/solr start -e cloud -a
> "-Denable.js.loading=true"}} . You would not need security during development
> , so don't add the private keys to Solr
> # create {{.system}} collection {{bin/solr create -c .system}}
> # Write your javascript code . (say {{test.js}} )
> # post it to {{.system}} collection . {{curl -X POST -H 'Content-Type:
> application/octet-stream' --data-binary @test.js
> http://localhost:8983/solr/.system/blob/test}}
> # run your script {{http://host:8983/solr/gettingstarted/js/test/1}}
> # Edit your script and repeat from step #4 . Keep in mind that the version
> would be bumped up every time you post a new script . So, the second time the
> url would be {{http://host:8983/solr/gettingstarted/js/test/2}} . So on and
> so forth
> sample programs
> 1) writes a val to output
> {code:javascript}
> //empty line
> $.response().add('testkey','Test Val');
> {code}
> 2) manipulate the output to add an extra field to each doc
> {code}
> //empty line
> var l = [];
> $.query({
> q: '*:*',
> qt: '/select',
> start:0,
> }).forEach('response', function(doc) {
> doc.put('script', 'Added this
> value');
> l.push(doc);
> });
> $.response().add('alldocs', l);
> {code}
> 3) stream through all the docs
> {code:Javascript}
> //empty line
> $.query({
> q: '*:*',
> qt: '/select',
> start:0,
> distrib:'false'
> }).pipe('response', 'docs', function(doc) { // the pipe function is
> executed right before the response writer and right after the transformers
> if('IT'== doc.get('genre_s')) return
> null;
> doc.put('script', 'Added this
> value');
> return doc;
> });
> {code}
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