batch-cluster

batch-cluster

Support external batch-mode tools within Node.js

Many command line tools, like ExifTool and GraphicsMagick, support running arbitrary commands via a "batch mode," which amortizes process spin-up costs over several, serial request/response pairs, sent via stdin/stdout.

Spinning up N of these child processes on multiprocessor machines gives you parallelism.

Distributing requests to these processes, monitoring and restarting processes as needed, and shutting them down appropriately, is what this module gives you.

This package powers exiftool-vendored.

Changelog

v0.0.2

• ✨ Added support and explicit tests for CR LF, CR, and LF encoded streams from exec'ed processes
• ✨ child processes are ended after maxProcAgeMillis, and restarted as needed
• 🐞 BatchCluster now practices good listener hygene for process.beforeExit

v0.0.1

• ✨ Extracted implementation and tests from exiftool-vendored

Versioning

The MAJOR or API version is incremented for

• 💔 Non-backward-compatible API changes
• 🌲 New releases of ExifTool that have externally visible changes

The MINOR or UPDATE version is incremented for

• 🌱 New releases of ExifTool with no externally visible changes
• ✨ Backwards-compatible features

The PATCH version is incremented for

• 🐞 Backwards-compatible bug fixes
• 📦 Minor packaging changes

Changelog

v0.0.2

• ✨ Added support and explicit tests for CR LF, CR, and LF encoded streams from spawned processes
• ✨ child processes are ended after maxProcAgeMillis, and restarted as needed
• 🐞 BatchCluster now practices good listener hygene for process.beforeExit