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[ML] Set df-analytics task state to failed when appropriate (#43880)

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This introduces a `failed` state to which the data frame analytics
persistent task is set to when something unexpected fails. It could
be the process crashing, the results processor hitting some error,
etc. The failure message is then captured and set on the task state.
From there, it becomes available via the _stats API as `failure_reason`.

The df-analytics stop API now has a `force` boolean parameter. This allows
the user to call it for a failed task in order to reset it to `stopped` after
we have ensured the failure has been communicated to the user.

This commit also adds the analytics version in the persistent task
params as this allows us to prevent tasks to run on unsuitable nodes in
the future.
This commit is contained in:
Dimitris Athanasiou 2019-07-03 10:59:52 +03:00 • committed by GitHub
parent 00a5e5a42a
commit d6f36a8e4f
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34 changed files with 566 additions and 118 deletions
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docs/java-rest/high-level/ml/stop-data-frame-analytics.asciidoc
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@ -19,6 +19,7 @@ A +{request}+ object requires a {dataframe-analytics-config} id.
include-tagged::{doc-tests-file}[{api}-request]
---------------------------------------------------
<1> Constructing a new stop request referencing an existing {dataframe-analytics-config}
<2> Optionally used to stop a failed task
include::../execution.asciidoc[]