The old restore supports adding prefix and suffix to the backup data. This allows us to restore a key space (say [a, b)) to a new key space (say [awesome_a, awesome_b).

This feature is useful in:

• Performance testing: We do not want to throw away existing loaded data in the cluster because loading a huge DB takes time;
• Cross-verification: Users may want to verify the restored data in the

There is instrumentation on the store timer that takes a future, but the problem can be that if a future is created and then stuff is done with it for a while before it is instrumented, the metric will only record time for the events that have happened after the future has been created.

One way to improve this might be to have a version of instrument that takes a `Supplier<CompletableFuture<T

Right now in insertElementRecursive(), DocLayer does NOT try to store arrays with null values as sparse arrays, i.e. for null value it still insert a k-v for it, which is kind of against what it attempts to achieve later when doing update (skipping the null values and effectively store those arrays as spars arrays). We should make the behavior consistent and do the same in insertion.

clear-all can be implemented with empty byte-array as begin and 255 as the end parameter. This can be helpful where we want to wipe all the keys similar to FLUSHALL in Redis. Similar thing can be done to implement get-all using get-range to return all the keys in the database.

Reference: https://forums.foundationdb.org/t/how-to-clear-all-keys-in-foun

There's lots of transaction & database methods which are missing documentation comments.

We should do a pass adding typescript tsdoc - compatible doc comments for all the normal function in (at a minimum) lib/transaction.ts and [lib/database.ts](

There's a number of talks that folk have done on FDB over time, that should be added to this list.

Off the top of my head, we should be able to find links to:

• Will Wilson's old simulation talk from strangeloop
• The FDB Summit 2018 videos

I'm also aware of two FDB podcast episodes, which had:

• Ryan Worl
• Ashish Motivala and Clement Pang

as the guests.

But there might also be ot

DirectoryLayer should return DBIO/ReadDBIO, and take immutable Seq as parameters instead of java.util.List.

List of tasks

• Add wrapper fns for mutate operation in the clj_fdb/src/transactions.clj file.
• Add relevant tests for the namespace.
• Add an example in vedang/farstar to show how this operation can be used.

Javadoc for Reference

• https://apple.github.io/foundationdb/javadoc/com/apple/foundationdb/Transaction.html#mutate-com.apple.foundationdb.MutationType-byte:A-byte:A-