Use rsync, Luke :) It work over unreliable links, can resume aborted and partial files.
2009/5/14 Ben Cohen <[email protected]>: > Hi all -- > > This is my first message to the list. I've been watching it for a little > while now and so far everything I read about the design of couchdb I like a > lot! Thanks so much for all the cool work! > > One of the uses I'm planning for couchdb involves replicating a database > across a slow, unreliable link which will never become anything other than > slow and unreliable. I understand the replication is incremental and > designed to 'pick up where it left off' in the case of replication > interruption. From the technical overview on the website: > >> The replication process is incremental. At the database level, replication >> only examines documents updated since the last replication. Then for each >> updated document, only fields and blobs that have changed are replicated >> across the network. If replication fails at any step, due to network >> problems or crash for example, the next replication restarts at the same >> document where it left off. >> > I've got a question about this process. Say you have a document to be > replicated with a 1 megabyte attachment. A replication process starts, half > the doc is transferred successfully and then the connection dies. Assuming > no changes to the source doc, when the replication restarts will the > transfer start from the beginning of the document or will it pick up > somewhere within the doc? > > For my use case I have a slow link that will periodically come online for a > certain fixed amount of time and initiate a replication. If the replication > isn't incremental 'within' a single document, then a document in the > database above a certain size will for me, never make it across and I would > imagine cause the replication to never make forward progress ... > > Does couchdb's replication magic avoid the issue for me and eventually > transfer the document across my link? > > Thanks much, > Ben Cohen -- ---------------- Best regards Elf mailto:[email protected]
