[jira] [Created] (FLINK-4620) Automatically creating savepoints

["Niels Basjes (JIRA)" <ji...@apache.org>]

Niels Basjes created FLINK-4620:
-----------------------------------

             Summary: 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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