a7a64443e1
This changeset adds a subsystem to run on the leader, similar to the deployment watcher or node drainer. The `Watcher` performs a blocking query on updates to the `CSIVolumes` table and triggers reaping of volume claims. This will avoid tying up scheduling workers by immediately sending volume claim workloads into their own loop, rather than blocking the scheduling workers in the core GC job doing things like talking to CSI controllers The volume watcher is enabled on leader step-up and disabled on leader step-down. The volume claim GC mechanism now makes an empty claim RPC for the volume to trigger an index bump. That in turn unblocks the blocking query in the volume watcher so it can assess which claims can be released for a volume.
29 lines
1.2 KiB
Go
29 lines
1.2 KiB
Go
package volumewatcher
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import (
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cstructs "github.com/hashicorp/nomad/client/structs"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// VolumeRaftEndpoints exposes the volume watcher to a set of functions
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// to apply data transforms via Raft.
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type VolumeRaftEndpoints interface {
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// UpsertVolumeClaims applys a batch of claims to raft
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UpsertVolumeClaims(*structs.CSIVolumeClaimBatchRequest) (uint64, error)
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}
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// ClientRPC is a minimal interface of the Server, intended as an aid
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// for testing logic surrounding server-to-server or server-to-client
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// RPC calls and to avoid circular references between the nomad
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// package and the volumewatcher
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type ClientRPC interface {
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ControllerDetachVolume(args *cstructs.ClientCSIControllerDetachVolumeRequest, reply *cstructs.ClientCSIControllerDetachVolumeResponse) error
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NodeDetachVolume(args *cstructs.ClientCSINodeDetachVolumeRequest, reply *cstructs.ClientCSINodeDetachVolumeResponse) error
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}
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// claimUpdater is the function used to update claims on behalf of a volume
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// (used to wrap batch updates so that we can test
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// volumeWatcher methods synchronously without batching)
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type updateClaimsFn func(claims []structs.CSIVolumeClaimRequest) (uint64, error)
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