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https://issues.apache.org/jira/browse/SLING-3395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901603#comment-13901603
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Tommaso Teofili commented on SLING-3395:
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committed in r1568345
> Event based reverse replication
> -------------------------------
>
> Key: SLING-3395
> URL: https://issues.apache.org/jira/browse/SLING-3395
> Project: Sling
> Issue Type: Improvement
> Components: Extensions
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Labels: replication
>
> Currently polling from remote instances can be done periodically via a
> "schedule" rule. An improved design would allow the poller to get
> notifications about when a new item to poll is available. Implementation wise
> this can be done via Websocket, Server Sent Events, Long Poll, etc. since it
> allows the polling instance to establish the connection and the polled
> instance to signal events there (like a command channel) asynchronously and
> let reverse replication happen only when needed.
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