Joel Bernstein updated SOLR-9559:
    Summary: Add ExecutorStream to execute stored Streaming Expressions  (was: 
Add ExecutorStream to execute a stream of Streaming Expressions)

> Add ExecutorStream to execute stored Streaming Expressions
> ----------------------------------------------------------
>                 Key: SOLR-9559
>                 URL: https://issues.apache.org/jira/browse/SOLR-9559
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
> The *ExecutorStream* will wrap a stream which contains Tuples with Streaming 
> Expressions to execute. By default the ExecutorStream will look for the 
> expression in the *expr* field in the Tuples.
> The ExecutorStream will have an internal thread pool so expressions can be 
> executed in parallel on a single worker. The ExecutorStream can also be 
> wrapped by the parallel function to partition the Streaming Expressions that 
> need to be executed across a cluster of worker nodes.
> Sample syntax:
> {code}
> daemon(executor(threads=10, topic(storedExpressions, fl="expr", ...)))
> {code}
> In the example above a *daemon* wraps an *executor* which wraps a *topic* 
> that is reading stored Streaming Expressions. The daemon will call the 
> executor at intervals which will execute all the expressions retrieved by the 
> topic.

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