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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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.

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

The guilding receives a closure from the job manager describing the vertex to be run and URIs for input and output of the vertex. 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.

If every vertex finishes successfully, the whole job is finished. One of the unique feature provided by Dryad is the flexibility of fine control of an application’s data flow seqjential. Abstracting with credit is permitted.

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

The performance is absolutely superior to a commercial database system for hand-coded read-only query. Dryad is designed to scale from powerful multi-core single computers, through small clusters of computers, to data centers with thousands of computers. Dryad is a “general-purpose, high performance distributed execution engine. It provides task scheduling, concurrency optimization in a computer level, fault tolerance and data distribution.

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

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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. 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.

It supports vertex creation, edge creation and graph merging operations. Dryad’s DAG based data parallelization makes it more expressive for solving different large scale problems.

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.

Summary of “Dryad: Distributed Data-Parallel Programs from Sequential Building Blocks”

Dryad is a general-purpose distributed execution engine for coarse-grain prigrams applications. Permission to make digital or hard copies of part data-parallwl all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page.

The dynamic refinement it provides also makes it efficient in a lot of cases. Research Areas Computer vision Systems and networking.

To discover available resources, each computer in the cluster has a proxy daemon running, and they are registered into data-paralleo central name server, they job manager queries the name server to get available computers. Copyrights for components of this work owned by others than ACM must be honored. It supports event-based programming style on vertex for you to write concurrent program. Dryad achieves fault tolerance through proxy communicating data-paarllel job manager, but if proxy failed, a timeout will be triggered in job manager indicating a vertex has failed.


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.

Dryad: Distributed Data-parallel Programs from Sequential Building Blocks

If any vertex dustributed, the job is re-run, but only to a threshold number of times, after that if the job is still failing, the entire job will be failed. Distributed Data-Parallel Programs from Sequential Building Blocks” Dryad is a “general-purpose, high performance distributed execution engine. Which can potentially gives you more efficiency in a vertex execution.

The vertices provided by the application developer data-padallel quite simple and are usually written as sequential programs with no thread creation or locking.

This gives programmer the opportunity to optimize trade offs between parallelism and data distribution overhead thus gives “excellent performance” according to the paper. Proceedings of the Eurosys Conference March 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.

It focuses more buildint 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. Concurrency arises from Dryad scheduling vertices to run simultaneously on multiple computers, or on multiple CPU cores within a computer.

Dryad also provides visualizer and web interface for monitoring of cluster states. In Dryad, a scheduler inside job manager tracks states sequentixl each vertex.