[role="xpack"] [[ml-job-resource]] === Job Resources A job resource has the following properties: `analysis_config`:: (object) The analysis configuration, which specifies how to analyze the data. See <>. `analysis_limits`:: (object) Defines approximate limits on the memory resource requirements for the job. See <>. `background_persist_interval`:: (time units) Advanced configuration option. The time between each periodic persistence of the model. The default value is a randomized value between 3 to 4 hours, which avoids all jobs persisting at exactly the same time. The smallest allowed value is 1 hour. + -- TIP: For very large models (several GB), persistence could take 10-20 minutes, so do not set the `background_persist_interval` value too low. -- `create_time`:: (string) The time the job was created. For example, `1491007356077`. `custom_settings`:: (object) Advanced configuration option. Contains custom meta data about the job. For example, it can contain custom URL information as shown in {xpack-ref}/ml-configuring-url.html[Adding Custom URLs to Machine Learning Results]. `data_description`:: (object) Describes the data format and how APIs parse timestamp fields. See <>. `description`:: (string) An optional description of the job. `finished_time`:: (string) If the job closed or failed, this is the time the job finished, otherwise it is `null`. `groups`:: (array of strings) A list of job groups. A job can belong to no groups or many. For example, `["group1", "group2"]`. `job_id`:: (string) The unique identifier for the job. `job_type`:: (string) Reserved for future use, currently set to `anomaly_detector`. `model_plot_config`:: (object) Configuration properties for storing additional model information. See <>. `model_snapshot_id`:: (string) A numerical character string that uniquely identifies the model snapshot. For example, `1491007364`. For more information about model snapshots, see <>. `model_snapshot_retention_days`:: (long) The time in days that model snapshots are retained for the job. Older snapshots are deleted. The default value is 1 day. `renormalization_window_days`:: (long) Advanced configuration option. The period over which adjustments to the score are applied, as new data is seen. The default value is the longer of 30 days or 100 `bucket_spans`. `results_index_name`:: (string) The name of the index in which to store the {ml} results. The default value is `shared`, which corresponds to the index name `.ml-anomalies-shared` `results_retention_days`:: (long) Advanced configuration option. The number of days for which job results are retained. Once per day at 00:30 (server time), results older than this period are deleted from Elasticsearch. The default value is null, which means results are retained. [[ml-analysisconfig]] ==== Analysis Configuration Objects An analysis configuration object has the following properties: `bucket_span`:: (time units) The size of the interval that the analysis is aggregated into, typically between `5m` and `1h`. The default value is `5m`. `categorization_field_name`:: (string) If this property is specified, the values of the specified field will be categorized. The resulting categories must be used in a detector by setting `by_field_name`, `over_field_name`, or `partition_field_name` to the keyword `mlcategory`. For more information, see {xpack-ref}/ml-configuring-categories.html[Categorizing Log Messages]. //<>. `categorization_filters`:: (array of strings) If `categorization_field_name` is specified, you can also define optional filters. This property expects an array of regular expressions. The expressions are used to filter out matching sequences off the categorization field values. This functionality is useful to fine tune categorization by excluding sequences that should not be taken into consideration for defining categories. For example, you can exclude SQL statements that appear in your log files. For more information, see {xpack-ref}/ml-configuring-categories.html[Categorizing Log Messages]. This property cannot be used at the same time as `categorization_analyzer`. If you only want to define simple regular expression filters to be applied prior to tokenization then it is easiest to specify them using this property. If you also want to customize the tokenizer or post-tokenization filtering then these filters must be included in the `categorization_analyzer` as `pattern_replace` `char_filter`s. The effect is exactly the same. //<>. `categorization_analyzer`:: (object or string) If `categorization_field_name` is specified, you can also define the analyzer that will be used to interpret the field to be categorized. See <>. //<>. `detectors`:: (array) An array of detector configuration objects, which describe the anomaly detectors that are used in the job. See <>. + + -- NOTE: If the `detectors` array does not contain at least one detector, no analysis can occur and an error is returned. -- `influencers`:: (array of strings) A comma separated list of influencer field names. Typically these can be the by, over, or partition fields that are used in the detector configuration. You might also want to use a field name that is not specifically named in a detector, but is available as part of the input data. When you use multiple detectors, the use of influencers is recommended as it aggregates results for each influencer entity. `latency`:: (time units) The size of the window in which to expect data that is out of time order. The default value is 0 (no latency). If you specify a non-zero value, it must be greater than or equal to one second. For more information about time units, see {ref}/common-options.html#time-units[Time Units]. + -- NOTE: Latency is only applicable when you send data by using the <> API. -- `multivariate_by_fields`:: (boolean) This functionality is reserved for internal use. It is not supported for use in customer environments and is not subject to the support SLA of official GA features. + -- If set to `true`, the analysis will automatically find correlations between metrics for a given `by` field value and report anomalies when those correlations cease to hold. For example, suppose CPU and memory usage on host A is usually highly correlated with the same metrics on host B. Perhaps this correlation occurs because they are running a load-balanced application. If you enable this property, then anomalies will be reported when, for example, CPU usage on host A is high and the value of CPU usage on host B is low. That is to say, you'll see an anomaly when the CPU of host A is unusual given the CPU of host B. NOTE: To use the `multivariate_by_fields` property, you must also specify `by_field_name` in your detector. -- `summary_count_field_name`:: (string) If this property is specified, the data that is fed to the job is expected to be pre-summarized. This property value is the name of the field that contains the count of raw data points that have been summarized. The same `summary_count_field_name` applies to all detectors in the job. + -- NOTE: The `summary_count_field_name` property cannot be used with the `metric` function. -- //// LEAVE UNDOCUMENTED `overlapping_buckets`:: (boolean) If set to `true`, an additional analysis occurs that runs out of phase by half a bucket length. This requires more system resources and enhances detection of anomalies that span bucket boundaries. `use_per_partition_normalization`:: () TBD //// [float] [[ml-detectorconfig]] ==== Detector Configuration Objects Detector configuration objects specify which data fields a job analyzes. They also specify which analytical functions are used. You can specify multiple detectors for a job. Each detector has the following properties: `by_field_name`:: (string) The field used to split the data. In particular, this property is used for analyzing the splits with respect to their own history. It is used for finding unusual values in the context of the split. `detector_description`:: (string) A description of the detector. For example, `Low event rate`. `exclude_frequent`:: (string) Contains one of the following values: `all`, `none`, `by`, or `over`. If set, frequent entities are excluded from influencing the anomaly results. Entities can be considered frequent over time or frequent in a population. If you are working with both over and by fields, then you can set `exclude_frequent` to `all` for both fields, or to `by` or `over` for those specific fields. `field_name`:: (string) The field that the detector uses in the function. If you use an event rate function such as `count` or `rare`, do not specify this field. + + -- NOTE: The `field_name` cannot contain double quotes or backslashes. -- `function`:: (string) The analysis function that is used. For example, `count`, `rare`, `mean`, `min`, `max`, and `sum`. For more information, see {xpack-ref}/ml-functions.html[Function Reference]. //<>. `over_field_name`:: (string) The field used to split the data. In particular, this property is used for analyzing the splits with respect to the history of all splits. It is used for finding unusual values in the population of all splits. For more information, see {xpack-ref}/ml-configuring-pop.html[Performing Population Analysis]. `partition_field_name`:: (string) The field used to segment the analysis. When you use this property, you have completely independent baselines for each value of this field. `use_null`:: (boolean) Defines whether a new series is used as the null series when there is no value for the by or partition fields. The default value is `false`. + + -- IMPORTANT: Field names are case sensitive, for example a field named 'Bytes' is different from one named 'bytes'. -- //// LEAVE UNDOCUMENTED `rules`:: (array) TBD //// `detector_index`:: (integer) Unique ID for the detector, used when updating it. Based on the order of detectors within the `analysis_config`, starting at zero. [float] [[ml-datadescription]] ==== Data Description Objects The data description defines the format of the input data when you send data to the job by using the <> API. Note that when configure a {dfeed}, these properties are automatically set. When data is received via the <> API, it is not stored in {es}. Only the results for anomaly detection are retained. A data description object has the following properties: `format`:: (string) Only `JSON` format is supported at this time. `time_field`:: (string) The name of the field that contains the timestamp. The default value is `time`. `time_format`:: (string) The time format, which can be `epoch`, `epoch_ms`, or a custom pattern. The default value is `epoch`, which refers to UNIX or Epoch time (the number of seconds since 1 Jan 1970). The value `epoch_ms` indicates that time is measured in milliseconds since the epoch. The `epoch` and `epoch_ms` time formats accept either integer or real values. + + -- NOTE: Custom patterns must conform to the Java `DateTimeFormatter` class. When you use date-time formatting patterns, it is recommended that you provide the full date, time and time zone. For example: `yyyy-MM-dd'T'HH:mm:ssX`. If the pattern that you specify is not sufficient to produce a complete timestamp, job creation fails. -- [float] [[ml-categorizationanalyzer]] ==== Categorization Analyzer The categorization analyzer specifies how the `categorization_field` is interpreted by the categorization process. The syntax is very similar to that used to define the `analyzer` in the <>. The `categorization_analyzer` field can be specified either as a string or as an object. If it is a string it must refer to a {ref}/analysis-analyzers.html[built-in analyzer] or one added by another plugin. If it is an object it has the following properties: `char_filter`:: (array of strings or objects) One or more {ref}/analysis-charfilters.html[character filters]. In addition to the built-in character filters other plugins may provide more. This property is optional. If not specified then there will be no character filters. If you are customizing some other aspect of the analyzer and need to achieve the equivalent of `categorization_filters` (which are not permitted when some other aspect of the analyzer is customized), add them here as {ref}/analysis-pattern-replace-charfilter.html[pattern replace character filters]. `tokenizer`:: (string or object) The name or definition of the {ref}/analysis-tokenizers.html[tokenizer] to use after character filters have been applied. This property is compulsory if `categorization_analyzer` is specified as an object. Machine learning provides a tokenizer called `ml_classic` that tokenizes in the same way as the non-customizable tokenizer in older versions of the product. If you would like to stick with this but change the character or token filters then specify `"tokenizer": "ml_classic"` in your `categorization_analyzer`. `filter`:: (array of strings or objects) One or more {ref}/analysis-tokenfilters.html[token filters]. In addition to the built-in token filters other plugins may provide more. This property is optional. If not specified then there will be no token filters. If you omit `categorization_analyzer` entirely then the default that will be used is the one from the following job: [source,js] -------------------------------------------------- POST _xpack/ml/anomaly_detectors/_validate { "analysis_config" : { "categorization_analyzer" : { "tokenizer" : "ml_classic", "filter" : [ { "type" : "stop", "stopwords": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "GMT", "UTC" ] } ] }, "categorization_field_name": "message", "detectors" :[{ "function":"count", "by_field_name": "mlcategory" }] }, "data_description" : { } } -------------------------------------------------- // CONSOLE However, if you specify any part of `categorization_analyzer` then any omitted sub-properties are _not_ defaulted. If you are categorizing non-English messages in a language where words are separated by spaces you may get better results if you change the day/month words in the stop token filter to those from your language. If you are categorizing messages in a language where words are not separated by spaces then you will need to use a different tokenizer as well in order to get sensible categorization results. It is important to be aware that analyzing for categorization of machine generated log messages is a little different to tokenizing for search. Features that work well for search, such as stemming, synonym substitution and lowercasing are likely to make the results of categorization worse. However, in order for drilldown from machine learning results to work correctly, the tokens that the categorization analyzer produces need to be sufficiently similar to those produced by the search analyzer that if you search for the tokens that the categorization analyzer produces you will find the original document that the field to be categorized came from. For more information, see {xpack-ref}/ml-configuring-categories.html[Categorizing Log Messages]. //<>. [float] [[ml-apilimits]] ==== Analysis Limits Limits can be applied for the resources required to hold the mathematical models in memory. These limits are approximate and can be set per job. They do not control the memory used by other processes, for example the Elasticsearch Java processes. If necessary, you can increase the limits after the job is created. The `analysis_limits` object has the following properties: `categorization_examples_limit`:: (long) The maximum number of examples stored per category in memory and in the results data store. The default value is 4. If you increase this value, more examples are available, however it requires that you have more storage available. If you set this value to `0`, no examples are stored. + + -- NOTE: The `categorization_examples_limit` only applies to analysis that uses categorization. For more information, see {xpack-ref}/ml-configuring-categories.html[Categorizing Log Messages]. -- `model_memory_limit`:: (long or string) The approximate maximum amount of memory resources that are required for analytical processing. Once this limit is approached, data pruning becomes more aggressive. Upon exceeding this limit, new entities are not modeled. The default value for jobs created in version 6.1 and later is `1024mb`. This value will need to be increased for jobs that are expected to analyze high cardinality fields, but the default is set to a relatively small size to ensure that high resource usage is a conscious decision. The default value for jobs created in versions earlier than 6.1 is `4096mb`. + -- If you specify a number instead of a string, the units are assumed to be MiB. Specifying a string is recommended for clarity. If you specify a byte size unit of `b` or `kb` and the number does not equate to a discrete number of megabytes, it is rounded down to the closest MiB. The minimum valid value is 1 MiB. If you specify a value less than 1 MiB, an error occurs. For more information about supported byte size units, see {ref}/common-options.html#byte-units[Byte size units]. If your `elasticsearch.yml` file contains an `xpack.ml.max_model_memory_limit` setting, an error occurs when you try to create jobs that have `model_memory_limit` values greater than that setting. For more information, see <>. -- [float] [[ml-apimodelplotconfig]] ==== Model Plot Config This advanced configuration option stores model information along with the results. It provides a more detailed view into anomaly detection. WARNING: If you enable model plot it can add considerable overhead to the performance of the system; it is not feasible for jobs with many entities. Model plot provides a simplified and indicative view of the model and its bounds. It does not display complex features such as multivariate correlations or multimodal data. As such, anomalies may occasionally be reported which cannot be seen in the model plot. Model plot config can be configured when the job is created or updated later. It must be disabled if performance issues are experienced. The `model_plot_config` object has the following properties: `enabled`:: (boolean) If true, enables calculation and storage of the model bounds for each entity that is being analyzed. By default, this is not enabled. `terms`:: (string) Limits data collection to this comma separated list of partition or by field values. If terms are not specified or it is an empty string, no filtering is applied. For example, "CPU,NetworkIn,DiskWrites". This is experimental. Only the specified `terms` can be viewed when using the Single Metric Viewer.