Dryad: Distributed data-parallel programs from sequential building blocks. Conference Paper (PDF Available) in ACM SIGOPS Operating Systems Review. DRYAD: DISTRIBUTED DATA-. PARALLEL PROGRAMS FROM. SEQUENTIAL. BUILDING BLOCKS. Authors: Michael Isard, Mihai Budiu, Yuan Yu,. Andrew. An improvement: Ciel. Comparison. Conclusion. Dryad: Distributed Data-Parallel Programs from. Sequential Building Blocks. Course: CS

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It focuses more on simplicity of the programming model and reliability, efficiency and scalability of the applications while side-stepped problems like high-latency and unreliable wide-area networks, control of resources by separate federated or competing entities and ACL, etc.

Dryad: Distributed Data-parallel Programs from Sequential Building Blocks – Microsoft Research

Dryad is designed to scale from powerful multi-core single computers, through small clusters of computers, to data centers with thousands of computers. Dryad’s DAG based data parallelization makes it more expressive for solving different large scale problems. If any vertex failed, the job is re-run, but only to a threshold number of times, after that if the job is still failing, the entire rfom will be failed.

Proceedings of the Eurosys Conference March It provides task scheduling, concurrency optimization in data-paarallel computer level, fault tolerance and data distribution. Dryad also provides visualizer and web interface for monitoring of cluster states. The performance is absolutely superior to a commercial database system for hand-coded read-only query.

The dynamic refinement it provides also makes it efficient in a lot of cases. Dryad is a general-purpose distributed execution engine for coarse-grain data-parallel applications. The vertices provided by the application developer are quite simple and are usually prohrams as sequential programs with no thread creation or locking.


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One caveat is you can only run 1 job in a cluster at a time, because the job manager assumes exclusive control over all computers within the cluster. In Dryad, a scheduler inside job manager tracks states of each vertex.

A Dryad job is coordinated by a process called job manager, can be either within the compute cluster or remote workstation that has access to the compute cluster. The runtime receives a closure from the job manager describing buildinng vertex to be run and URIs for input and output of the vertex. One of the unique feature provided by Dryad is the flexibility of fine control of an application’s data flow graph.

Dryad: distributed data-parallel programs from sequential building blocks – Dimensions

Distributed Data-Parallel Programs from Sequential Building Blocks” Dryad is a “general-purpose, high performance distributed execution engine. One interesting property provided by Dryad is it can turn a graph G into a vertex V Gessentially similar to the composite design pattern, it improves the re-usability a lot. Concurrency arises from Dryad scheduling vertices to run simultaneously on multiple computers, or on multiple CPU cores within a computer.

If every vertex finishes successfully, the whole job is finished. Which can potentially gives you more efficiency in a vertex execution. It supports vertex creation, edge creation and graph merging operations.

Copyrights for components of this work owned by others than ACM must be honored. Dryad runs the application by executing the vertices of this graph on a set of available computers, communicating as appropriate through files, TCP pipes, and shared-memory FIFOs.


Dryad achieves fault tolerance through proxy communicating with job manager, but if proxy failed, a timeout will be triggered in job manager indicating a vertex has failed. The application can discover the size and placement of data at run time, and modify the graph as the computation progresses to make efficient use of the available resources.

It supports event-based programming style on vertex for you to write concurrent program.

Dryad: Distributed Data-parallel Programs from Sequential Building Blocks

Dryad is a “general-purpose, high performance distributed execution engine. In contrast to MapReduce, Dryad doesn’t do serialization, for the vertex program’s perspective, what they see is a heap object passed from the previous vertex, which will certainly save a lot of data parsing headaches.

Abstracting with credit is permitted. To discover available resources, each computer in the cluster has a proxy daemon running, and they are registered into a central name server, they job manager queries the name server to get available computers. A Dryad job consists of DAG where each vertex is a program and each edge is a data channel, data channel can be shared memory, TCP pipes, or temp files.

Research Areas Computer vision Systems and networking. This gives programmer the opportunity dtyad optimize trade offs between parallelism and data distribution overhead thus gives “excellent performance” according to the paper.

Dryad also provides a backup task mechanism when noticing a vertex has been slower than their peers, similar to the one used to MapReduce.