Chunk Delete Error with Storj S3

I am using Storj with their S3 backend in order to use it with Duplicacy. Just noticed I’ve been having pruning errors. Whole log is pasted below, but relevant part is:

2021-11-08 16:33:26.457 ERROR CHUNK_DELETE Failed to fossilize the chunk f772f468c86968be0e03889aa03a4271ca4ad9ea1754139dedaf0020952a0adf: NotImplemented: A header you provided implies functionality that is not implemented
	status code: 501, request id: 16B5AFAF1B30604B, host id: 
Failed to fossilize the chunk f772f468c86968be0e03889aa03a4271ca4ad9ea1754139dedaf0020952a0adf: NotImplemented: A header you provided implies functionality that is not implemented
Running prune command from /cache/localhost/all
Options: [-log prune -storage Storj -keep 0:365 -keep 30:180 -keep 7:30 -keep 1:2 -a]
2021-11-08 16:32:22.639 INFO STORAGE_SET Storage set to s3://us1@gateway.us1.storjshare.io/xxxxx
2021-11-08 16:32:23.259 INFO RETENTION_POLICY Keep no snapshots older than 365 days
2021-11-08 16:32:23.259 INFO RETENTION_POLICY Keep 1 snapshot every 30 day(s) if older than 180 day(s)
2021-11-08 16:32:23.259 INFO RETENTION_POLICY Keep 1 snapshot every 7 day(s) if older than 30 day(s)
2021-11-08 16:32:23.259 INFO RETENTION_POLICY Keep 1 snapshot every 1 day(s) if older than 2 day(s)
2021-11-08 16:33:00.185 INFO SNAPSHOT_DELETE Deleting snapshot shared at revision 2
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2021-11-08 16:33:16.252 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 41
2021-11-08 16:33:16.276 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 42
2021-11-08 16:33:16.301 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 43
2021-11-08 16:33:16.325 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 44
2021-11-08 16:33:16.349 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 45
2021-11-08 16:33:16.378 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 46
2021-11-08 16:33:16.402 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 47
2021-11-08 16:33:16.426 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 49
2021-11-08 16:33:16.450 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 50
2021-11-08 16:33:16.475 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 51
2021-11-08 16:33:16.503 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 52
2021-11-08 16:33:16.528 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 53
2021-11-08 16:33:16.552 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 54
2021-11-08 16:33:16.576 INFO SNAPSHOT_DELETE Deleting snapshot docker at revision 55
2021-11-08 16:33:26.457 ERROR CHUNK_DELETE Failed to fossilize the chunk f772f468c86968be0e03889aa03a4271ca4ad9ea1754139dedaf0020952a0adf: NotImplemented: A header you provided implies functionality that is not implemented
	status code: 501, request id: 16B5AFAF1B30604B, host id: 
Failed to fossilize the chunk f772f468c86968be0e03889aa03a4271ca4ad9ea1754139dedaf0020952a0adf: NotImplemented: A header you provided implies functionality that is not implemented

This looks like they didn’t implement the COPY operation, which is needed by Duplicacy to rename a chunk file which can then be safely removed later once it is sure that this chunk isn’t used by other backups in progress.

You can work around this issue by add -exclusive to the prune job. This will delete any unreferenced chunks immediately but you’ll have to make sure that no backups are running during the prune operation.

Native support for storj was requested here Suggestion: Storj DCS support and there is a go library. Storj seems to be getting traction and growing, perhaps it’s a low hanging fruit worth implementing that will get duplicacy additional interest. Using s3 gateway, even if it supported COPY, diminishes a few benefits storj provides.

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I’ll give it a try this week.

You can work around this issue by add -exclusive to the prune job. This will delete any unreferenced chunks immediately but you’ll have to make sure that no backups are running during the prune operation.

Where possible, anything Duplicacy can handle it-self, it should. When people like different/optional behaviour, parameter’s should be given to allow user to make it work the way they want (this should be the non-standard/exceptional cases though)