Hello. I have a question about the restore mode of Flink. Flink 1.15 starts to provide three restore modes:

CLAIM

,

NO_CLAIM

, and

LEGACY

. Assume that my Flink application restores from a savepoint

SVP-1

with restore mode

CLAIM

. As time goes by, my Flink application creates new savepoints

SVP-2

,

SVP-3

, and so on. From the doc, the

CLAIM

mode may delete

SVP-1

when Flink thinks

SVP-1

is not needed for recovery anymore. How about

SVP-2

,

SVP-3

and future savepoints? Will them also be deleted if Flink thinks them no longer required? Thanks in advance for any reply.

Savepoints are already self-contained, claim mode is for checkpoints

Sorry. I’m not good at English. From the sentences below, I thought claim mode works for savepoint as well. I am curious about the difference between claim and no_claim modes. My understanding is that claim mode might delete the snapshot (either savepoint or externalized checkpoints) that is used to restore the Flink application but no_claim mode won’t. There is no difference between claim and no_claim modes for the savepoints and checkpoints created after restoring. If I misunderstand the two modes, please let me know. Thanks.

The

Restore Mode

determines who takes ownership of the files that make up savepoints or externalized checkpoints after they are restored. Snapshots, which are either checkpoints or savepoints in this context, can be owned either by a user or Flink itself. (doc)