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Ensure tasks with banned parents always get cancelled #90188

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pxsalehi
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The check used to entirely skip parent lookup relies on ConcurrentHashMap#isEmpty() which could return inconsistent results, and potentially skip the cancellation of a task with a banned parent upon registration, as brought up by @original-brownbear, and it doesn't seem to have a benefit considering the hash code computation.

Closes #88201

@pxsalehi pxsalehi added the :Distributed Coordination/Task Management Issues for anything around the Tasks API - both persistent and node level. label Sep 21, 2022
@elasticsearchmachine elasticsearchmachine added v8.5.0 Team:Distributed (Obsolete) Meta label for distributed team (obsolete). Replaced by Distributed Indexing/Coordination. labels Sep 21, 2022
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Pinging @elastic/es-distributed (Team:Distributed)

@pxsalehi pxsalehi added v8.4.3 v7.17.7 auto-backport-and-merge >test Issues or PRs that are addressing/adding tests labels Sep 21, 2022
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@elasticmachine update branch

@csoulios csoulios added v8.6.0 and removed v8.5.0 labels Sep 21, 2022
@pxsalehi pxsalehi added v8.5.1 and removed v8.4.3 labels Sep 22, 2022
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LGTM

@pxsalehi pxsalehi merged commit 9f5dee8 into elastic:main Sep 22, 2022
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Thank, Armin.

pxsalehi added a commit to pxsalehi/elasticsearch that referenced this pull request Sep 22, 2022
The check used to entirely skip parent lookup relies on
ConcurrentHashMap#isEmpty() which could return inconsistent results, and
potentially skip the cancellation of a task with a banned parent upon
registration, and it doesn't seem to have a benefit considering the hash
code computation.

Closes elastic#88201
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💔 Backport failed

Status Branch Result
7.17 Commit could not be cherrypicked due to conflicts
8.5

You can use sqren/backport to manually backport by running backport --upstream elastic/elasticsearch --pr 90188

pxsalehi added a commit to pxsalehi/elasticsearch that referenced this pull request Sep 22, 2022
The check used to entirely skip parent lookup relies on
ConcurrentHashMap#isEmpty() which could return inconsistent results, and
potentially skip the cancellation of a task with a banned parent upon
registration, and it doesn't seem to have a benefit considering the hash
code computation.

Closes elastic#88201
elasticsearchmachine pushed a commit that referenced this pull request Sep 22, 2022
The check used to entirely skip parent lookup relies on
ConcurrentHashMap#isEmpty() which could return inconsistent results, and
potentially skip the cancellation of a task with a banned parent upon
registration, and it doesn't seem to have a benefit considering the hash
code computation.

Closes #88201
elasticsearchmachine pushed a commit that referenced this pull request Sep 22, 2022
The check used to entirely skip parent lookup relies on
ConcurrentHashMap#isEmpty() which could return inconsistent results, and
potentially skip the cancellation of a task with a banned parent upon
registration, and it doesn't seem to have a benefit considering the hash
code computation.

Closes #88201

Co-authored-by: Elastic Machine <[email protected]>
@csoulios csoulios added v8.5.0 and removed v8.5.1 labels Nov 1, 2022
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[CI] IndicesSegmentsRestCancellationIT testCatSegmentsRestCancellation failing
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