Adding one thing, the format of the non-incremental is similar but unfortunately not (yet) identical with the FS backend. This is because of some internal implementation details that allow the FS checkpoints to be slightly more consise in the file format but we might „de-optimize“ this minor difference for the sake of compatibility in the near future.
> Am 26.04.2018 um 15:22 schrieb Chirag Dewan <chirag.dewa...@yahoo.in>: > > Wow never considered it that way. > > Thanks a lot for clarifying Stefan. > > This gives rise to another question. Whats the format of this data? Is it the > same format which is used to store checkpoints when FS state backend is used? > > Regards, > > Chirag > > Sent from Yahoo Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > On Thu, 26 Apr 2018 at 5:30 PM, Stefan Richter > <s.rich...@data-artisans.com> wrote: > Hi, > > I think there is a misunderstanding. RocksDB state backend always operates on > local disk of the node that runs your task to give you optimal performance. > You can think of this as a transient working area that does not require any > durability. Durability always happens through checkpoints (or savepoints) > which, in turn, go to a distributed storage. Checkpoints and checkpoints are > like a consistent moment-in-time image of the backends content and can be > used to recover under failure (checkpoints) or manually resume your job > (savepoints). > > Best, > Stefan > >> Am 26.04.2018 um 13:16 schrieb Chirag Dewan <chirag.dewa...@yahoo.in >> <mailto:chirag.dewa...@yahoo.in>>: >> >> Hi, >> >> I am working on a use case where I need to store a large amount of data in >> state. I am using RocksDB as my state backend. Now to ensure data >> replication, I want to store the RocksDB files in some distributed file >> system. >> >> From the documentation I can see that Flink recommends a list of FileSystem >> to be used for state backend. Given here : >> >> Apache Flink 1.4 Documentation: File Systems >> <https://ci.apache.org/projects/flink/flink-docs-release-1.4/ops/filesystems.html> >> >> Apache Flink 1.4 Documentation: File Systems >> >> <https://ci.apache.org/projects/flink/flink-docs-release-1.4/ops/filesystems.html> >> >> But I cannot figure out the file system for RocksDB. What are the >> recommendations for File Systems to be used with RocksDB? >> >> Thanks in advance. >> >> Regards, >> >> Chirag >> >
