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Updated Filer Change Data Capture (markdown)

Chris Lu 2020-11-13 13:33:53 -08:00
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Filer-Change-Data-Capture.md

@ -2,6 +2,8 @@ Is it too much a dream to have something similar to [inotify](https://man7.org/l
Actually SeaweedFS can give you more! Actually SeaweedFS can give you more!
# Example
Here is an example, in Java: Here is an example, in Java:
https://github.com/chrislusf/seaweedfs/blob/master/other/java/examples/src/main/java/com/seaweedfs/examples/WatchFiles.java https://github.com/chrislusf/seaweedfs/blob/master/other/java/examples/src/main/java/com/seaweedfs/examples/WatchFiles.java
@ -21,6 +23,18 @@ Basically there are four types of events to handle:
| Delete | exists | null | exists | equal to Directory | | Delete | exists | null | exists | equal to Directory |
| Rename | exists | exists | exists | not equal to Directory | | Rename | exists | exists | exists | not equal to Directory |
# Other Languages
This is based on Filer gRPC API. You should be able to easily implement it in your own language. This is based on Filer gRPC API. You should be able to easily implement it in your own language.
https://github.com/chrislusf/seaweedfs/blob/master/weed/pb/filer.proto#L52 https://github.com/chrislusf/seaweedfs/blob/master/weed/pb/filer.proto#L52
# Possible Use Cases
This is event processing for files. The possible use cases are all up to your imagination.
* Detect new image or video files. Add versions with different resolutions.
* A **distributed configuration distribution**: stores configuration files under a folder. Detect the configuration changes and reload.
* A **job queue**: upload files to a folder, and processing new files as soon as possible, and delete the processed files.
* Do-it-yourself **Data Replication or Backup**.