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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
