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37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
package balancer
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/milvus-io/milvus/pkg/v2/streaming/util/types"
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"github.com/milvus-io/milvus/pkg/v2/util/typeutil"
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)
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var (
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_ Balancer = (*balancerImpl)(nil)
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ErrBalancerClosed = errors.New("balancer is closed")
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)
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// Balancer is a load balancer to balance the load of log node.
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// Given the balance result to assign or remove channels to corresponding log node.
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// Balancer is a local component, it should promise all channel can be assigned, and reach the final consistency.
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// Balancer should be thread safe.
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type Balancer interface {
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// GetLatestWALLocated returns the server id of the node that the wal of the vChannel is located.
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GetLatestWALLocated(ctx context.Context, pchannel string) (int64, bool)
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// WatchChannelAssignments watches the balance result.
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WatchChannelAssignments(ctx context.Context, cb func(version typeutil.VersionInt64Pair, relations []types.PChannelInfoAssigned) error) error
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// MarkAsAvailable marks the pchannels as available, and trigger a rebalance.
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MarkAsUnavailable(ctx context.Context, pChannels []types.PChannelInfo) error
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// Trigger is a hint to trigger a balance.
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Trigger(ctx context.Context) error
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// Close close the balancer.
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Close()
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}
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