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dropping from clusters

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Dropping from a cluster drops from every node of the cluster.
Including nodes that the cluster does not think have the content.
This is different from GET and CHECKPRESENT, which do trust the
cluster's location log. The difference is that removing from a cluster
should make 100% the content is gone from every node. So doing extra
work is ok. Compare with CHECKPRESENT where checking every node could
make it very expensive, and the worst that can happen in a false
negative is extra work being done.

Extended the P2P protocol with FAILURE-PLUS to handle the case where a
drop from one node succeeds, but a drop from another node fails. In that
case the entire cluster drop has failed.

Note that SUCCESS-PLUS is returned when dropping from a proxied remote
that is not a cluster, when the protocol version supports it. This is
because P2P.Proxy does not know when it's proxying for a single node
cluster vs for a remote that is not a cluster.
This commit is contained in:
Joey Hess 2024-06-23 09:28:18 -04:00
parent a6a04b7e5e
commit 5b332a87be
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14 changed files with 144 additions and 59 deletions
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4
Command/Move.hs
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@ -193,7 +193,7 @@ toPerform' mcontentlock dest removewhen key afile fastcheck isthere = do
DropCheckNumCopies -> do
(numcopies, mincopies) <- getSafestNumMinCopies afile key
(tocheck, verified) <- verifiableCopies key [srcuuid]
verifyEnoughCopiesToDrop "" key (Just contentlock)
verifyEnoughCopiesToDrop "" key (Just srcuuid) (Just contentlock)
numcopies mincopies [srcuuid] verified
(UnVerifiedRemote dest : tocheck)
(drophere setpresentremote contentlock . showproof)
@ -299,7 +299,7 @@ fromDrop src destuuid deststartedwithcopy key afile adjusttocheck =
DropCheckNumCopies -> do
(numcopies, mincopies) <- getSafestNumMinCopies afile key
(tocheck, verified) <- verifiableCopies key [Remote.uuid src]
verifyEnoughCopiesToDrop "" key Nothing numcopies mincopies [Remote.uuid src] verified
verifyEnoughCopiesToDrop "" key (Just (Remote.uuid src)) Nothing numcopies mincopies [Remote.uuid src] verified
(adjusttocheck tocheck) (dropremote . showproof) faileddropremote
DropWorse -> faileddropremote
where