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From "Erik Hatcher (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1725) Script based UpdateRequestProcessorFactory
Date Tue, 03 Jul 2012 13:53:22 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405934#comment-13405934
] 

Erik Hatcher commented on SOLR-1725:
------------------------------------

bq. I would rather people have to write a few no-op methods and get good errors then rip their
hair out – or have data loss – because they have a subtle typo in a function name that
they don't notice

No argument there.  I think this just demands that we implement an add-only type of capability
such that the entire script is implicitly inside a processAdd call.  The most common use case
here is for processAdd, and streamlining this to be easy and less-error-prone (why even have
"processAdd" method wrapper at all if we're aiming for less hair pulling?) for the common
needs.  We can iterate on that after a commit of what's there though.... having a full update
processor via script is great too, for sure.
                
> Script based UpdateRequestProcessorFactory
> ------------------------------------------
>
>                 Key: SOLR-1725
>                 URL: https://issues.apache.org/jira/browse/SOLR-1725
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>    Affects Versions: 1.4
>            Reporter: Uri Boness
>            Assignee: Erik Hatcher
>              Labels: UpdateProcessor
>             Fix For: 4.1
>
>         Attachments: SOLR-1725-rev1.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch
>
>
> A script based UpdateRequestProcessorFactory (Uses JDK6 script engine support). The main
goal of this plugin is to be able to configure/write update processors without the need to
write and package Java code.
> The update request processor factory enables writing update processors in scripts located
in {{solr.solr.home}} directory. The functory accepts one (mandatory) configuration parameter
named {{scripts}} which accepts a comma-separated list of file names. It will look for these
files under the {{conf}} directory in solr home. When multiple scripts are defined, their
execution order is defined by the lexicographical order of the script file name (so {{scriptA.js}}
will be executed before {{scriptB.js}}).
> The script language is resolved based on the script file extension (that is, a *.js files
will be treated as a JavaScript script), therefore an extension is mandatory.
> Each script file is expected to have one or more methods with the same signature as the
methods in the {{UpdateRequestProcessor}} interface. It is *not* required to define all methods,
only those hat are required by the processing logic.
> The following variables are define as global variables for each script:
>  * {{req}} - The SolrQueryRequest
>  * {{rsp}}- The SolrQueryResponse
>  * {{logger}} - A logger that can be used for logging purposes in the script

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