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- OpenVZ (openvz.org): a community project, supported by the company Parallels, Inc. An OS-level virtualization technology based on the Linux kernel.
Impression: Good for server consolidation, web hosting. Seems to be production quality. For Linux only, so at least does not seem a good fit for the high-level VM architecture technology.
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Impression: Similar to OpenVZ, an OS-level virtualization technology: a container runs the same kernel as the host, so at least does not seem a good fit for the high-level VM architecture technology. OpenVZ functionality + distributed architecture to set up repositories and pull images from and push images to the repositories. OpenVZ is system-centric, while Docker is application-centric, where each container is meant to execute one application. For example, the "docker log <ctid>" command shows the stdout of the command/program running in the container. Popular, under active development.
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The following assumptions are made in the design:
- the an extractor is installed as a service on a VM, so when a VM starts, all the extractors that the VM contains as services will start automatically and successfully;
- the resource limitation of using extractors to process input data is CPU processing, not memory, hard disk I/O, or network I/O, so the design is only for scaling for CPU usage;
- the system needs to support multiple OS types, including both Linux and Windows;
- the system uses RabbitMQ as the messaging technology.
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- the length of the RabbitMQ queue > a pre-defined thresholdsthreshold, such as 100 or 1000, or
- the number of consumers (extractors) for this queue is 0.
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The team seems to be familiar, more comfortable with Java or Scala, so we consider using these. This module mainly operates on by itself, instead of mainly serving client requests, so it does not have to be a web app. A stand-alone app seems a better fit.
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