OpenSearch/docs/java-rest/high-level/ml/forecast-job.asciidoc
Benjamin Trent c8374dc9f3
[ML] add max_model_memory parameter to forecast request (#57254) (#57355)
This adds a max_model_memory setting to forecast requests. 
This setting can take a string value that is formatted according to byte sizes (i.e. "50mb", "150mb").

The default value is `20mb`.

There is a HARD limit at `500mb` which will throw an error if used.

If the limit is larger than 40% the anomaly job's configured model limit, the forecast limit is reduced to be strictly lower than that value. This reduction is logged and audited.

related native change: https://github.com/elastic/ml-cpp/pull/1238

closes: https://github.com/elastic/elasticsearch/issues/56420
2020-05-29 11:16:08 -04:00

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--
:api: forecast-job
:request: ForecastJobRequest
:response: ForecastJobResponse
--
[role="xpack"]
[id="{upid}-{api}"]
=== Forecast Job API
The Forecast Job API provides the ability to forecast a {ml} job's behavior based
on historical data.
It accepts a +{request}+ object and responds
with a +{response}+ object.
[id="{upid}-{api}-request"]
==== Forecast Job Request
A +{request}+ object gets created with an existing non-null `jobId`.
All other fields are optional for the request.
["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests-file}[{api}-request]
--------------------------------------------------
<1> Constructing a new request referencing an existing `jobId`
==== Optional Arguments
The following arguments are optional.
["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests-file}[{api}-request-options]
--------------------------------------------------
<1> Set when the forecast for the job should expire
<2> Set how far into the future should the forecast predict
<3> Set the maximum amount of memory the forecast is allowed to use.
Defaults to 20mb. Maximum is 500mb, minimum is 1mb. If set to
40% or more of the job's configured memory limit, it is
automatically reduced to below that number.
[id="{upid}-{api}-response"]
==== Forecast Job Response
A +{response}+ contains an acknowledgement and the forecast ID
["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests-file}[{api}-response]
--------------------------------------------------
<1> `isAcknowledged()` indicates if the forecast was successful
<2> `getForecastId()` provides the ID of the forecast that was created
include::../execution.asciidoc[]