Thank you Till for the clarification, that was helpful. Best, Yassine
2017-02-02 15:31 GMT+01:00 Till Rohrmann <trohrm...@apache.org>: > Hi Yassine, > > a periodic checkpoint is checkpoint which will be triggered periodically > by Flink. The checkpoint itself can have multiple properties and one of > them is whether the checkpoint is externalized or not. > > An externalized checkpoint is a checkpoint for which Flink writes the meta > information into a target directory. In contrast to that, for a > non-externalized checkpoint Flink will store the checkpoint meta > information only in memory. The former has the advantage that you don't > lose the checkpoints if you shutdown your cluster. They behave similar to > savepoints and in fact savepoints are externalized checkpoints with some > more properties. > > At the moment, Flink's checkpoint coordinator only retains the last > successfully completed checkpoint. This means that whenever a new > checkpoint completes then the last completed checkpoint will be discarded. > This also applies to externalized checkpoints. > > Cheers, > Till > > On Wed, Feb 1, 2017 at 2:03 PM, Yassine MARZOUGUI < > y.marzou...@mindlytix.com> wrote: > >> Hi all, >> >> Could someone clarify the difference between externalized checkpoints[1] >> and regular periodic checkpoints[2]? >> Moreover, I have a question regarding the retention of checkpoints: For >> regular checkpoints, does the last checkpoint discard the previous ones? If >> yes, is that the case too for the externalized checkpoints? Thank you. >> >> Best, >> Yassine >> >> [1] : https://ci.apache.org/projects/flink/flink-docs-release-1.2/ >> setup/checkpoints.html >> [2] : https://ci.apache.org/projects/flink/flink-docs-release-1. >> 2/dev/stream/checkpointing.html >> > >
