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Built-in SQL Aggregation Jobs

Built-in SQL aggregation jobs

Enabling signals automatically creates the necessary _signals and _signals_aggr collections, plus several Parameterized SQL Aggregation jobs for signal processing and aggregation:

Table 1. Signals aggregation jobs
Job Default input collection Default output collection Default schedule

<collection>_signals

<collection>_signals_aggr

Every 15 minutes

<collection>_signals

<collection>_signals

Every 15 minutes

<collection>_signals

<collection>_signals_aggr

Once per day

<collection>_signals

<collection>_signals_aggr

Once per day

When signals are enabled, you can view these jobs at Collections > Jobs. Each one is explained in more detail below.

<collection>_click_signals_aggregation

The <collection>_click_signals_aggregation job computes a time-decayed weight for each document, query, and filters group in the signals collection. Fusion computes the weight for each group using an exponential time-decay on signal count (30 day half-life) and a weighted sum based on the signal type. This approach gives more weight to a signal that represents a user purchasing an item than to a user just clicking on an item.

You can customize the the signal types and weights for this job by changing the signalTypeWeights SQL parameter in the Fusion Admin UI.

signalTypeWeights

When the SQL aggregation job runs, Fusion translates the signalTypeWeights parameter into a WHERE IN clause to filter signals by the specified types (click, cart, purchase), and also passes the parameter into the weighted_sum SQL function. Notice that Fusion only displays the SQL parameters and not the actual SQL for this job. This is to simplify the configuration because, in most cases, you only need to change the parameters and not worry about the actual SQL. However, if you need to change the SQL for this job, you can edit it under the Advanced toggle on the form.

Tip
A user can configure the <collection>_click_signals_aggregation job to use a parquet file as the source of raw signals instead of a signal Fusion collection.
  1. Use catalog api to set up a "catalog project” in Fusion:

    sample code:
    curl -u <username>:<pw> -X POST -H "Content-type:application/json" --data-binary '{
     "name": "fusion_test",
     "assetType": "project",
     "description": "test",
     "cacheOnLoad": false
    }' http://localhost:{api-port}/api/catalog
  2. Create an assets table in the project created in previous step:

    sample code:
    curl -u <username>:<pw> -X POST -H "Content-type:application/json" --data-binary '{
      "name": "doc_test",
      "assetType": "table",
      "projectId": "fusion_test",
      "description": "for documentation",
      "tags": ["fusion"],
      "format": "parquet",
      "cacheOnLoad": false,
      "options" : [ "path -> <path to your .parquet file>"]
    }' http://localhost:{api-port}/api/catalog/fusion_test/assets
    Note
    The parquet file listed above needs to have all the fields in the SQL script which the <collection>_click_signals_aggregation job is selecting/using.
  3. In the <collection>_click_signals_aggregation job, change “source” from ${collection}_signals to catalog:${project_name}.${asset_name} (e.g. catalog:fusion_test.doc_test per the sample code).

    catalog input

  4. Start the job.

<​collection>_session_rollup

The <collection>_session_rollup job aggregates related user activity into a session signal that contains activity count, duration, and keywords (based on user search terms). The Fusion App Insights application uses this job to show reports about user sessions. Use the elapsedSecsSinceLastActivity and elapsedSecsSinceSessionStart parameters to determine when a user session is considered to be complete. You can edit the SQL using the Advanced toggle.

The <collection>_session_rollup job uses signals as the input collection and output collection. Unlike other aggregation jobs that write aggregated documents to the <collection>_signals_aggr collection, the <collection>_session_rollup job creates session signals and saves them to the <collection>_signals collection.

<​collection>_user_item_preferences_aggregation

The <collection>_user_item_preferences_aggregation job computes an aggregated weight for each user/item combination found in the signals collection. The weight for each group is computed using an exponential time-decay on signal count (30 day half-life) and a weighted sum based on the signal type.

Note
This job is a prerequisite for the ALS recommender job.
Job configuration tips:
  • In the job configuration panel, click Advanced to see all of the available options.

  • When aggregating signals for the first time, uncheck the Aggregate and Merge with Existing checkbox. In production, once the jobs are running automatically then this box can be checked. Note that if you want to discard older signals then by unchecking this box those old signals will essentially be replaced completely by the new ones.

  • If the original signal data has missing fields, edit the SQL query to fill in missing values for fields such as “count_i” (the number of times a user interacted with an item in a session).

  • Sometimes the aggregation job can run faster by unchecking the Job Skip Check Enabled box. Do this when first loading the signals.

  • Use the signalTypeWeights SQL parameter to set the correct signal types and weights for your dataset. Its value is a comma-delimited list of signal types and their stakeholder-defined level of importance. Think of this numeric value as a weight that tells which type of signal is most important for determining a user’s interest in an item. An example of how to weight the signal types is shown below:

    signal_type_1:1.0, signal_type_2: 3.0, signal_type_3: 20.0

    Rank your signal types to determine which types should be added. Add only the signal types that are significant. Signal types that are not added to the list will not be included in the aggregation job, and for some signal types this is fine.

    The weights should be within orders of magnitude of each other. The spread of values should not be wide. For instance, click:1.0, cart:100000.0 is too wide of a spread. The values of click:1.0 and cart:50.0 would be a reasonable setting, indicating that the signal type of cart is 50 times more important for measuring a user’s interest in an item.

  • The Time Range field value is used in a weight decay function that reduces the importance of signals the older they are. This time range is in days and the default is 30 days. If you want to increase this time because the time duration of your signals is greater than 30 days, edit the SQL query to reflect the desired number of days. The SQL query is visible when you click Advanced in the job configuration panel. Modify the following line in the SQL query, changing "30 days" to your desired timeframe:

    time_decay(count_i, timestamp_tdt, "30 days", ref_time, weight_d) AS typed_weight_d

If recommendations are enabled for your collection, then the ALS recommender job is automatically created with the name <collection>_item_recommendations and scheduled to run after this job completes. Consequently, you should only run this aggregation once or twice a day, because training a recommender model is a complex, long-running job that requires significant resources from your Fusion cluster.

<​collection>_user_query_history_aggregation

The <collection>_user_query_history_aggregation job computes an aggregated weight for each user/query combination found in the signals collection. The weight for each group is computed using an exponential time-decay on signal count (30 day half-life) and a weighted sum based on the signal type. Use the signalTypeWeights parameter to set the correct signal types and weights for your dataset. You can use the results of this job to boost queries for a user based on their past query activity.