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Hybris is a key-value hybrid cloud storage system that robustly replicates data over untrusted public clouds while keeping metadata on trusted private premises.
Thanks to this design, Hybris provides strong consistency guarantees (i.e., linearizability) and affordable Byzantine fault tolerance (i.e., withstanding f faulty clouds with as few as 2f+1 replicas).
Hybris is also very efficient: in the common case it writes to f+1 clouds and read from only a single cloud.

For more information and detailed benchmarks read our technical report.

Hybris code base is composed by two main modules: MdsManager and KvsManager, the first being a thin wrapper layer of the metadata distributed storage service (i.e. ZooKeeper), while the latter implements the storage primitives towards the APIs of the main public cloud storage services - currently, it supports Amazon S3, Google Cloud Storage, Rackspace Cloud Files and Windows Azure Blob.

Maven is used for building and managing dependencies.

Read the wiki for more information on development setup.

Hybris has been developed at EURECOM as part of the CloudSpaces European research project.
Its code is released under the terms of Apache 2.0 license.

Erasure coding support is provided by the jerasure library and its JNI bindings.