![]() ![]() Databricks recommends rewriting Shiny apps such that they do not require a long-lived connection and do not over-rely on session state. However, the underlying WebSocket connection can close at any time by a variety of factors including network instability or computer sleep mode. ![]() ![]() You must refresh the Shiny app to reconnect in these cases. There is a hard limit of 12 hours since the initial page load after which any connection, even if active, will be terminated. This is an exciting course for analysts who want to increase the relevance and visibility of their work. # Write an app that uses spark to access data on Databricks # First, install the following packages: install.packages (‘ future’ ) install.packages (‘ promises’ ) library ( shiny ) library ( promises ) library ( future ) plan ( multisession ) HEARTBEAT_INTERVAL_MILLIS = 1000 # 1 second # Define the long Spark job here run_spark % result () # Or: fut % result() busy ( 1 ) # Catch exceptions and notify the user fut <- catch ( fut, function ( e ) shinyApp ( ui = ui, server = server ) Find out how to register for RPubs to deploy RStudio presentations for sharing, and then go beyond the basics with Shinyadding interactivity and creating embeddable dashboards without the need for HTML or JavaScript. ![]()
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