[jira] [Updated] (SOLR-8965) Add Path reduce operation to aggregate paths in a session

["Joel Bernstein (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joel Bernstein updated SOLR-8965:
---------------------------------
    Summary: Add Path reduce operation to aggregate paths in a session  (was: Add Path reduce operation to aggregate paths taken in a session)

> Add Path reduce operation to aggregate paths in a session
> ---------------------------------------------------------
>
>                 Key: SOLR-8965
>                 URL: https://issues.apache.org/jira/browse/SOLR-8965
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Joel Bernstein
>
> One of the things it's tricky to do at scale is session aggregation. MapReduce of course makes this easy. Now that we have MapReduce it would be good to add some session aggregations to the base library. 
> The Path reduce operation can be used with the *reduce* function to concatenate the path taken in a session into a single field. These path records can then be added to another SolrCloud collection using the update stream. Once they have been consolidated in another collection aggregations can be run on the paths using the RollupStream.
> A HashRollupStream could also be developed to aggregate the paths as they are reduced. The HashRollupStream would keep all the paths in a hash map during the aggregation so it would not require the paths to be received in order.



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