| Ian Maxon | d885779 | 2015-09-11 14:19:53 -0700 | [diff] [blame] | 1 | ~~ Licensed to the Apache Software Foundation (ASF) under one |
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| Ian Maxon | 137fc3b | 2015-06-30 16:23:48 -0700 | [diff] [blame] | 17 | |
| vinayakb | 0c86039 | 2012-10-06 18:47:20 +0000 | [diff] [blame] | 18 | Hyracks Overview |
| 19 | |
| 20 | Hyracks employs a client-server architecture. On the server side, the software module that is responsible for interacting with clients, keeping track of and dispatching work |
| 21 | to other machines in the cluster is called the Hyracks Cluster Controller (CC). There is one CC per logical Hyracks cluster. The module that executes on the worker machine |
| 22 | and interacts with the CC to receive work and act on it, is called the Hyracks Node Controller (NC). Every NC in a single Hyracks cluster has a unique logical name. When an |
| 23 | NC is started, it is provided the address of the CC whose cluster it must join. Although it is sufficient to run one instance of the NC on a physical machine, it is possible |
| 24 | to run multiple instances of NCs (ofcourse each NC has a different logical name) on the same physical machine -- often used for simulating a cluster on a single machine |
| 25 | to facilitate testing. |
| 26 | |
| 27 | Hyracks clients interact solely with the CC when submitting their jobs. A Hyracks Job is the unit of work that a client can execute on the Hyracks cluster. A job is expressed |
| 28 | as a directed acyclic graph (DAG) of Operators connected to each other by means of Connectors. A more detailed description of jobs, operators, and connectors follows in |
| 29 | chapter "Hyracks Concepts". |