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https://issues.apache.org/jira/browse/IGNITE-13198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17184684#comment-17184684
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Igor Seliverstov edited comment on IGNITE-13198 at 8/25/20, 7:01 PM:
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Reworked in a next way:
Because a node having intermediate fragment may leave, there will be nobody who
closes upstream fragment execution. Now a root fragment node is responsible for
closing(cancelling) all query fragments.
It seems overcomplicated to pass an error through all query fragments, so, an
error is sent right to a root fragment node (after the error reaches an Outbox
node inside a local execution fragment).
Node left events are processed by Inbox nodes, it allows simpler failover
handling and an ability to successfully finish a query in case it got all
needed data from a failed node. On node left an error will be passed to a user
and query will be automatically closed.
Root node left event is processed by Outbox node, this way a query will be
automatically closed.
was (Author: gvvinblade):
Reworked in a next way:
Because a node, having intermediate fragment, may leave there will be nobody
who closes upstream fragment execution. Now a root fragment node is responsible
for closing(cancelling) all query fragments.
It seems overcomplicated to pass an error through all query fragments, so, an
error is sent right to a root fragment node (after the error reaches an Outbox
node inside a local execution fragment).
Node left events are processed by Inbox nodes, it allows simpler failover
handling and an ability to successfully finish a query in case it got all
needed data from a failed node. On node left an error will be passed to a user
and query will be automatically closed.
Root node left event is processed by Outbox node, this way a query will be
automatically closed.
> Calcite integration. Rework error / cancel logic at execution
> -------------------------------------------------------------
>
> Key: IGNITE-13198
> URL: https://issues.apache.org/jira/browse/IGNITE-13198
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Taras Ledkov
> Assignee: Igor Seliverstov
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Change error & cancel logic on query execution.
> *Error*
> - propagated from source to downstream nodes.
> - Always propagated to the RootNode;
> - RootNode receive an error and cancel all execution tree.
> *Cancel*
> - propagated from downstream to source;
> - any node may cancel its execution sub-tree;
> - (technical details) to prevent race on Inbox creation Outbox resend Cancel
> message to Inbox.
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