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From "Niels Basjes (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4620) Automatically creating savepoints
Date Fri, 23 Sep 2016 14:50:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516660#comment-15516660
] 

Niels Basjes commented on FLINK-4620:
-------------------------------------

Done.

> Automatically creating savepoints
> ---------------------------------
>
>                 Key: FLINK-4620
>                 URL: https://issues.apache.org/jira/browse/FLINK-4620
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.1.2
>            Reporter: Niels Basjes
>
> In the current versions of Flink you can run an external command and then a savepoint
is persisted in a durable location.
> Feature request: Make this a lot more automatic and easy to use.
> _Proposed workflow_
> # In my application I do something like this:
> {code}
> StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
> env.setStateBackend(new FsStateBackend("hdfs:///tmp/applicationState"));
> env.enableCheckpointing(5000, CheckpointingMode.EXACTLY_ONCE);
> env.enableAutomaticSavePoints(300000);
> env.enableAutomaticSavePointCleaner(10);
> {code}
> # When I start the application for the first time the state backend is 'empty'. 
> I expect the system to start in a clean state.
> After 10 minutes (300000ms) a savepoint is created and stored.
> # When I stop and start the topology again it will automatically restore the last available
savepoint.
> Things to think about:
> * Note that this feature still means the manual version is useful!!
> * What to do on startup if the state is incompatible with the topology? Fail the startup?
> * How many automatic savepoints to we keep? Only the last one?
> * Perhaps the API should allow multiple automatic savepoints at different intervals in
different locations.
> {code}
> // Make every 10 minutes and keep the last 10
> env.enableAutomaticSavePoints(300000, new FsStateBackend("hdfs:///tmp/applicationState"),
10);
> // Make every 24 hours and keep the last 30
> // Useful for being able to reproduce a problem a few days later
> env.enableAutomaticSavePoints(86400000, new FsStateBackend("hdfs:///tmp/applicationDailyStateSnapshot"),
30);
> {code}



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