This logic was originally part of `spreadEcShards()`, which got removed during
the unification effort with `ec.balance` (https://github.com/seaweedfs/seaweedfs/pull/6344),
accidentally breaking functionality in the process.
The commit restores the deletion code for EC'd volumes - with parallelization support.
What problem are we solving?
Fix: #6379
How are we solving the problem?
We check for the AllowEmptyFolders option prior to cascade
deleting parent folders in S3 DeleteMultipleObjectsHandler.
How is the PR tested?
We ran SeaweedFS in a Kubernetes Cluster with a joint Filer
and S3 server in one container, with leveldb2 as the filer storage,
and AllowEmptyFolders set to true.
When using the Distribution Registry as the S3 client, it calls the
DeleteMultipleObjectsHandler as part of the artifact upload process
(uploads to a temp location, then performs a copy and delete).
Without this fix, the deletion cascade deleted parent folder until
the entire contents of the bucket were gone.
With this fix, the existing content of the bucket remained, and the
newly uploaded content was added.
Checks
[ ] I have added unit tests if possible.
[ ] I will add related wiki document changes and link to this PR after merging.
Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>
Rework `shell.EcBalance()`'s waitgroup with errors code into a standalone type.
We'll re-use this for other EC jobs - for example, volume creation. Also fixes
potential concurrency issues when collecting error results.
* Begin implementing EC balancing parallelization support.
Impacts both `ec.encode` and `ec.balance`,
* Nit: improve type naming.
* Make the goroutine workgroup handler for `EcBalance()` a bit smarter/error-proof.
* Nit: unify naming for `ecBalancer` wait group methods with the rest of the module.
* Fix concurrency bug.
* Fix whitespace after Gitlab automerge.
* Delete stray TODO.
* Account for replication placement settings when balancing EC shards within racks.
* Update help contents for `ec.balance`.
* Add a few more representative test cases for `pickEcNodeToBalanceShardsInto()`.
* Improve EC shards rebalancing logic across nodes.
- Favor target nodes with less preexisting shards, to ensure a fair distribution.
- Randomize selection when multiple possible target nodes are available.
- Add logic to account for replication settings when selecting target nodes (currently disabled).
* Fix minor test typo.
* Clarify internal error messages for `pickEcNodeToBalanceShardsInto()`.
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