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https://issues.apache.org/jira/browse/SOLR-9684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15788328#comment-15788328
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Joel Bernstein commented on SOLR-9684:
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We can think about the naming of this some more.
The reason why I called it 'schedule' is that it *schedules* higher priority
tasks ahead of lower priority tasks. Possibly more scheduling features could be
added in the future.
> Add schedule Streaming Expression
> ---------------------------------
>
> Key: SOLR-9684
> URL: https://issues.apache.org/jira/browse/SOLR-9684
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Fix For: master (7.0), 6.4
>
> Attachments: SOLR-9684.patch, SOLR-9684.patch, SOLR-9684.patch
>
>
> SOLR-9559 adds a general purpose *parallel task executor* for streaming
> expressions. The executor() function executes a stream of tasks and doesn't
> have any concept of task priority.
> The scheduler() function wraps two streams, a high priority stream and a low
> priority stream. The scheduler function emits tuples from the high priority
> stream first, and then the low priority stream.
> The executor() function can then wrap the scheduler function to see tasks in
> priority order.
> Pseudo syntax:
> {code}
> daemon(executor(schedule(topic(tasks, q="priority:high"), topic(tasks,
> q="priority:low"))))
> {code}
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