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ASF GitHub Bot logged work on BEAM-6857: ---------------------------------------- Author: ASF GitHub Bot Created on: 15/Jan/20 14:18 Start Date: 15/Jan/20 14:18 Worklog Time Spent: 10m Work Description: rehmanmuradali commented on issue #10316: [BEAM-6857] Support Dynamic Timers URL: https://github.com/apache/beam/pull/10316#issuecomment-574654628 Run Dataflow ValidatesRunner ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 372342) Time Spent: 16h 10m (was: 16h) > Support dynamic timers > ---------------------- > > Key: BEAM-6857 > URL: https://issues.apache.org/jira/browse/BEAM-6857 > Project: Beam > Issue Type: Bug > Components: sdk-java-core > Reporter: Reuven Lax > Assignee: Shehzaad Nakhoda > Priority: Major > Time Spent: 16h 10m > Remaining Estimate: 0h > > The Beam timers API currently requires each timer to be statically specified > in the DoFn. The user must provide a separate callback method per timer. For > example: > > {code:java} > DoFn<String, String>() > { > @TimerId("timer1") > private final TimerSpec timer1 = TimerSpecs.timer(...); > @TimerId("timer2") > private final TimerSpec timer2 = TimerSpecs.timer(...); > ...... set timers in processElement > @OnTimer("timer1") > public void onTimer1() { .....} > @OnTimer("timer2") > public void onTimer2() {....} > } > {code} > > However there are many cases where the user does not know the set of timers > statically when writing their code. This happens when the timer tag should be > based on the data. It also happens when writing a DSL on top of Beam, where > the DSL author has to create DoFns but does not know statically which timers > their users will want to set (e.g. Scio). > > The goal is to support dynamic timers. Something as follows; > > {code:java} > DoFn<String, String>() > { > @TimerId("timer") > private final TimerSpec timer1 = TimerSpecs.dynamicTimer(...); > @ProcessElement process(@TimerId("timer") DynamicTimer timer) > { > timer.set("tag1'", ts); > timer.set("tag2", ts); > } > @OnTimer("timer") > public void onTimer1(@TimerTag String tag) { .....} > } > {code} > -- This message was sent by Atlassian Jira (v8.3.4#803005)