Patching System

The project is currently in the prototype state. In this project, I've demonstrated a patching mechanism that supports both:

• WARM_PATCH : The resources that the target process relies on are patched and the target notified. The target isn't killed or restarted.
• COLD_PATCH : The core target process itself is patched and thus has to be restarted.

New Features:

• Instead of pasting the patch contents, now the patch comes as a zip file, just put the zip file in the patch folder.
• Uses Checksums to validate whether a patch package has been corrupted or not.

Demo!

The Demo is compromised of 4 cases. Please open the project in an IDE of your choice and run the Supervisor class.

• Case 1 : Warm Patch: In this case, the resources that the target process relies on are patched and the target stays online, which means 0 downtime.

  • Restore the resources to the pre-patch state by replacing the work directory with the one in work.zip
  • copy the patch.zip from ./patch cases/case 1- Warm Handover/patch and place in ./patch/
  • Run the Supervisor and enter this command in the Patch Overseer Window initiate patch
  • As you can see in the image below, the target resumed job with the updated resources it got from the patch. It was never killed.

• Case 2 : Cold Patch: In this case, the running process itself has undergone some modifications and needs to shutdown and run again.

  • Restore the resources to the pre-patch state by replacing the work directory with the one in work.zip
  • Copy the patch.zip from ./patch cases/case 2 - Cold Reboot/patch and place in ./patch/
  • Run the Supervisor and enter this command in the Patch Overseer Window initiate patch
  • As you can see in the image below, the target had to shutdown, patched and then restarted, it's now at v2.0.

• Case 3 : Region Doesn't Match: In this case, the target procecss is running in the region ''us-east-1'' and the patch is meant for the region ''India''

  • Restore the resources to the pre-patch state by replacing the work directory with the one in work.zip
  • copy the patch.zip from ./patch cases/case 3 - Region Doesn't match/patch and place in ./patch/
  • Run the Supervisor and enter this command in the Patch Overseer Window initiate patch
  • As you can see in the image below, the patch is not applied since it's not meant for this regions. The target procecss is running in the region ''us-east-1'' and the patch is meant for the region ''India''

• Case 4 : Build Greater: In this case, the running process is already at a higher build number than the patch, basically the patch which we're pushing is old.

  • Restore the resources to the pre-patch state by replacing the work directory with the one in work.zip
  • copy the patch.zip from ./patch cases/case 4 - Build Greater/patch and place in ./patch/
  • Run the Supervisor and enter this command in the Patch Overseer Window initiate patch
  • As you can see in the image below, the patch is not applied since the target is already at a higher build.