fdb-zk
fdb-zk is a FoundationDB layer that mimics the behavior of Zookeeper. It is installed as a local service to an application, and replaces connections to and the operation of a ZooKeeper cluster.
While the core operations are implemented, fdb-zk has not been vetted for proper production use.
Talk & Slides
Learn about how the layer works in greater detail:
Architecture
Similar to the FoundationDB Document Layer, fdb-zk is hosted locally and translates requests for the target service into FoundationDB transactions.
Applications can continue to use their preferred Zookeeper clients:
┌──────────────────────┐ ┌──────────────────────┐
│ ┌──────────────────┐ │ │ ┌──────────────────┐ │
│ │ Application │ │ │ │ Application │ │
│ └──────────────────┘ │ │ └──────────────────┘ │
│ │ │ │ │ │
│ │ │ │ │ │
│ ZooKeeper │ │ ZooKeeper │
│ protocol │ │ protocol │
│ │ │ │ │ │
│ │ │ │ │ │
│ ▼ │ │ ▼ │
│ ┌──────────────────┐ │ │ ┌──────────────────┐ │
│ │ fdb-zk service │ │ │ │ fdb-zk service │ │
│ └──────────────────┘ │ │ └──────────────────┘ │
└──────────────────────┘ └──────────────────────┘
│ │
FDB ops FDB ops
│ │
▼ ▼
┌───────────────────────────────────────────────────┐
│ FoundationDB │
└───────────────────────────────────────────────────┘
Features
fdb-zk implements the core Zookeeper 3.4.6 API:
createexistsdeletegetDatasetDatagetChildren- watches
- session management
It partially implements:
multitransactions (reads are fine, but there are no read-your-writes)
It does not yet implement:
getACL/setACL- quotas
Initial Design Discussion
https://forums.foundationdb.org/t/fdb-zk-rough-cut-of-zookeeper-api-layer/1278/
Building with Bazel
- Compiling:
bazel build //:fdb_zk - Testing:
bazel test //:fdb_zk_test - Dependencies:
bazel query @maven//:all --output=build
License
fdb-zk is under the Apache 2.0 license. See the LICENSE file for details.