[jira] [Created] (FLINK-18955) Add snapshot path to job startup message

[Shang Yuanchun (Jira)]

Nico Kruber created FLINK-18955:
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             Summary: Add snapshot path to job startup message
                 Key: FLINK-18955
                 URL: https://issues.apache.org/jira/browse/FLINK-18955
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.11.1
            Reporter: Nico Kruber


When a job is started from a checkpoint or savepoint (I'm using snapshot as the unanimous term below), the {{CheckpointCoordinator}} prints a log line like this:
{code}
2020-08-13 13:50:51,418 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - Restoring job 220d8a4953cd40198b6eb3b1ec0cece0 from latest valid checkpoint: Checkpoint 357 @ 1597326576925 for 220d8a4953cd40198b6eb3b1ec0cece0.
{code}

I propose to add the path to the snapshot to this message because which snapshot is taken for restore may actually not be that obvious for the user: even if a savepoint was specified in the job start command, e.g. in a Kubernetes pod spec, an HA store could overrule the decision and take a more recent snapshot instead. If that snapshot is a savepoint, it is not that easy to map this to checkpoint IDs and find out which savepoint the job actually started from.



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