[jira] [Assigned] (UNOMI-739) Implemenation of purge of sessions / events following rollover usage.

["Jonathan Sinovassin-Naïk (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/UNOMI-739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Sinovassin-Naïk reassigned UNOMI-739:
----------------------------------------------

    Assignee: Jonathan Sinovassin-Naïk

> Implemenation of purge of sessions / events following rollover usage.
> ---------------------------------------------------------------------
>
>                 Key: UNOMI-739
>                 URL: https://issues.apache.org/jira/browse/UNOMI-739
>             Project: Apache Unomi
>          Issue Type: New Feature
>            Reporter: David Griffon
>            Assignee: Jonathan Sinovassin-Naïk
>            Priority: Major
>
> Currently the configuration is set by:
> {code:java}
> # Purge all monthly indexes (sessions/events) that have been created for a specific number of months
> org.apache.unomi.monthly.index.purge.existTime=${env:UNOMI_MONTHLY_INDEX_PURGE_EXISTTIME:-12}
> {code}
> it has to be changed to allow a purge by type: session and event
> {code:java}
> org.apache.unomi.sessions.purge.existTime=${env:UNOMI_SESSIONS_PURGE_EXISTTIME:-}
> org.apache.unomi.events.purge.existTime=${env:UNOMI_EVENTS_PURGE_EXISTTIME:-}
> {code}
> *Old value should be deprecated and use as default if the new one are not set.*
> h2. Implementation
> 2 mechanisms need to be implemented in the purge of sessions / events:
> h3. Deleting old documents:
> There is a job that currently purge monthly indices and profiles, the goal is to replace the [monthly indices purge|https://github.com/apache/unomi/blob/7feff5c5067ff679a079211d9f2eb989898efc75/services/src/main/java/org/apache/unomi/services/impl/profiles/ProfileServiceImpl.java#L402] by a dedicated method to remove events and sessions.
> This method will work as the [profile purge|https://github.com/apache/unomi/blob/7feff5c5067ff679a079211d9f2eb989898efc75/services/src/main/java/org/apache/unomi/services/impl/profiles/ProfileServiceImpl.java#L333] calling {{{}persistenceService.removeByQuery(..){}}}.
> Like in here:
> [https://github.com/apache/unomi/blob/7feff5c5067ff679a079211d9f2eb989898efc75/services/src/main/java/org/apache/unomi/services/impl/profiles/ProfileServiceImpl.java#L365]
> *A log need to be added to mention the number of document removed.*
> h3. Removing empty indices.
> When documents are deleted, it will happen that some indices contain no document, we need to have a dedicated execution to remove the empty indices.
> *A log need to be added to mention the deleted indices and the remaining indices with the number of documents in each.*
> h2. Handle TODOs
> Look for UNOMI-726 todos within the code:
>  - Remove index deletion from the rollup configuration.
>  - Enable back and adapt integration test related to the purge.
>  - Remove the delete actions in the rollover configuration in the migration file of the event/session indexes. (create_rollover_policy_query.json file) 



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