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Broadcast cancellation to only nodes have outstanding child tasks (#54312)

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Today when canceling a task we broadcast ban/unban requests to all nodes 
in the cluster. This strategy does not scale well for hierarchical
cancellation. With this change, we will track outstanding child requests
and broadcast the cancellation to only nodes that have outstanding child
tasks. This change also prevents a parent task from sending child
requests once it got canceled.

Relates #50990
Supersedes #51157

Co-authored-by: Igor Motov <igor@motovs.org>
Co-authored-by: Yannick Welsch <yannick@welsch.lu>
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Nhat Nguyen 2020-04-01 11:22:13 -04:00 • committed by GitHub
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4
docs/java-rest/high-level/tasks/cancel_tasks.asciidoc
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@ -22,7 +22,9 @@ include-tagged::{doc-tests}/TasksClientDocumentationIT.java[cancel-tasks-request
--------------------------------------------------
<1> Cancel a task
<2> Cancel only cluster-related tasks
<3> Cancel all tasks running on nodes nodeId1 and nodeId2
<3> Should the request block until the cancellation of the task and its child tasks is completed.
Otherwise, the request can return soon after the cancellation is started. Defaults to `false`.
<4> Cancel all tasks running on nodes nodeId1 and nodeId2
==== Synchronous Execution