Are JuiceFS objects immutable

[mcassaniti]

I wanted to confirm if JuiceFS objects are immutable when written to S3 or another object store. By immutable I mean:

• The object is written to only once and never updated
• The object can be read multiple times
• The object could be deleted, probably by compaction or a file delete

I ask because I'm using Garage as my S3 object store and currently it is in consistent mode. If objects are immutable then I can safely switch to degraded mode and read off the closest node. Degraded mode means read-after-write consistency is not guaranteed, but if the object is never updated then we'll either read a fully written object or get the object from another node.

I would be happy to add some documentation for Garage to JuiceFS as well.

[jiefenghuang]

yes, objects are immutable.

[mcassaniti]

Thanks for the feedback. I will get to the documentation that I said I'd provide in the next couple of weeks.