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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-9684) Add schedule Streaming Expression
Date Fri, 30 Dec 2016 20:34:58 GMT

    [ https://issues.apache.org/jira/browse/SOLR-9684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15788296#comment-15788296
] 

ASF subversion and git services commented on SOLR-9684:
-------------------------------------------------------

Commit be119d2aa082e176c88dd72c674dbd406d5ec9a2 in lucene-solr's branch refs/heads/branch_6x
from [~joel.bernstein]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=be119d2 ]

SOLR-9684: Add schedule Streaming Expression


> 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
>         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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