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https://issues.apache.org/jira/browse/LENS-619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Himanshu Gahlaut updated LENS-619:
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Description:
Lens will always accept a new query from a user and put it in a scheduling
queue for processing.
Next candidate query picked up from scheduling queue for processing will be
launched only if all query launching constraints evaluated on candidate query
and launched queries allows the candidate query to be launched, otherwise the
candidate query will be added to waiting queries.
When any launched query is finished, a waiting query selector will select
waiting queries for rescheduling using a list of waiting queries selection
policy. Every waiting query selection policy will return a list of eligible
waiting queries to be rescheduled. Query Selector will calculate intersection
of multiple list of eligible waiting queries and add the result of intersection
to scheduling queue for reprocessing.
At initialization, Query Launching Constraints and Waiting Query Selection
Policies will be configured using configuration values.
New Query Launching Constraints and Waiting Query Selection Policies can be
added at runtime, without rebuilding and deploying lens module.
Waiting Queries will be persisted across server restarts.
was:
This is the refined model after knowledge crunching:
Lens will always accept a new query from a user and put it in a scheduling
queue for processing.
Next candidate query picked up from scheduling queue for processing will be
launched only if all query launching constraints evaluated on candidate query
and launched queries allows the candidate query to be launched, otherwise the
candidate query will be added to waiting queries.
When any launched query is finished, a set of waiting query selectors will
select next waiting queries eligible for scheduling. Intersection of result of
all waiting query selectors will be added to scheduling queue for reprocessing.
At initialization, Query Launching Constraints and Waiting Query Selectors will
be configured using configuration values.
New Query Launching Constraints and Waiting Query Selectors can be added at run
time, without rebuilding and deploying lens module.
Waiting Queries will be persisted across server restarts.
> Applying Query Launching Constraints before allowing a query to be launched
> ---------------------------------------------------------------------------
>
> Key: LENS-619
> URL: https://issues.apache.org/jira/browse/LENS-619
> Project: Apache Lens
> Issue Type: New Feature
> Reporter: Himanshu Gahlaut
> Assignee: Himanshu Gahlaut
>
> Lens will always accept a new query from a user and put it in a scheduling
> queue for processing.
> Next candidate query picked up from scheduling queue for processing will be
> launched only if all query launching constraints evaluated on candidate query
> and launched queries allows the candidate query to be launched, otherwise the
> candidate query will be added to waiting queries.
> When any launched query is finished, a waiting query selector will select
> waiting queries for rescheduling using a list of waiting queries selection
> policy. Every waiting query selection policy will return a list of eligible
> waiting queries to be rescheduled. Query Selector will calculate intersection
> of multiple list of eligible waiting queries and add the result of
> intersection to scheduling queue for reprocessing.
> At initialization, Query Launching Constraints and Waiting Query Selection
> Policies will be configured using configuration values.
> New Query Launching Constraints and Waiting Query Selection Policies can be
> added at runtime, without rebuilding and deploying lens module.
> Waiting Queries will be persisted across server restarts.
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