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Dedup send can only deduplicate over the set of blocks in the send command being invoked, and it does not take advantage of the dedup table to do so. This is a very common misconception among not only users, but developers, and makes the feature seem more useful than it is. As a result, many users are using the feature but not getting any benefit from it. Dedup send requires a nontrivial expenditure of memory and CPU to operate, especially if the dataset(s) being sent is (are) not already using a dedup-strength checksum. Dedup send adds developer burden. It expands the test matrix when developing new features, causing bugs in released code, and delaying development efforts by forcing more testing to be done. As a result, we are deprecating the use of `zfs send -D` and receiving of such streams. This change adds a warning to the man page, and also prints the warning whenever dedup send or receive are used. In a future release, we plan to: 1. remove the kernel code for generating deduplicated streams 2. make `zfs send -D` generate regular, non-deduplicated streams 3. remove the kernel code for receiving deduplicated streams 4. make `zfs receive` of deduplicated streams process them in userland to "re-duplicate" them, so that they can still be received. Reviewed-by: Paul Dagnelie <pcd@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #7887 Closes #10117 |
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