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From "Robert Metzger (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-11852) Improve Processing function example
Date Mon, 15 Apr 2019 11:05:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-11852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Metzger updated FLINK-11852:
-----------------------------------
    Component/s: API / DataStream

> Improve Processing function example
> -----------------------------------
>
>                 Key: FLINK-11852
>                 URL: https://issues.apache.org/jira/browse/FLINK-11852
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / DataStream, Documentation
>    Affects Versions: 1.7.2
>            Reporter: Flavio Pompermaier
>            Assignee: TANG Wen-hui
>            Priority: Minor
>
> In the processing function documentation ([https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/operators/process_function.html)] there's
an "abusive" usage of the timers since a new timer is registered for every new tuple coming
in. This could cause problems in terms of allocated objects and could burden the overall application.
> It could worth to mention this problem and remove useless timers, e.g.:
>  
> {code:java}
> CountWithTimestamp current = state.value();
> if (current == null) {
>      current = new CountWithTimestamp();
>      current.key = value.f0;
>  } else {
>     ctx.timerService().deleteEventTimeTimer(current.lastModified + timeout);
>  }{code}
>  



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