Serge Huber created UNOMI-1044:
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Summary: Tracker: keep events that could not be sent, and send
them again when Unomi is back
Key: UNOMI-1044
URL: https://issues.apache.org/jira/browse/UNOMI-1044
Project: Apache Unomi
Issue Type: Improvement
Components: unomi-tracker
Reporter: Serge Huber
Fix For: unomi-tracker-2.1.0
When Unomi is briefly unreachable, the tracker loses the events of that moment:
page views, clicks and form submits are never stored. With a retry buffer, the
tracker keeps them and sends them again once Unomi answers, without making
visitors wait.
To decide: where the buffer is kept (sessionStorage or localStorage, so events
survive leaving the page), exponential backoff with jitter, a maximum number of
attempts, a maximum age and size, avoiding duplicates (an event id Unomi
recognises) and keeping the original event time, a single sending tab, and
emptying the buffer when tracking is turned off. With the buffer, clicks and
forms need not wait for the event to be sent (see E).
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