[
https://issues.apache.org/jira/browse/FLINK-4620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15493397#comment-15493397
]
Stephan Ewen commented on FLINK-4620:
-------------------------------------
Adding [~uce] to this thread.
There is a FLIP to unify checkpoints and savepoints:
https://cwiki.apache.org/confluence/display/FLINK/FLIP-10%3A+Unify+Checkpoints+and+Savepoints
I think periodic savepoints are quite reasonable and fit well with the concept
of unified checkpoints and savepoints.
> 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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
