96b0b27f18
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. |
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