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55 lines
2.5 KiB
Go
55 lines
2.5 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/proto/streamingpb"
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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/syncutil"
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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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// GetAllStreamingNodes fetches all streaming node info.
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GetAllStreamingNodes(ctx context.Context) (map[int64]*types.StreamingNodeInfo, error)
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// UpdateBalancePolicy update the balance policy.
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UpdateBalancePolicy(ctx context.Context, req *streamingpb.UpdateWALBalancePolicyRequest) (*streamingpb.UpdateWALBalancePolicyResponse, error)
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// RegisterStreamingEnabledNotifier registers a notifier into the balancer.
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// If the error is returned, the balancer is closed.
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// Otherwise, the following rules are applied:
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// 1. If the streaming service already enabled once (write is applied), the notifier will be notified before this function returns.
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// 2. If the streaming service is not already enabled,
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// the notifier will be notified when the streaming service can be enabled (all node in cluster is upgrading to 2.6)
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// and the balancer will wait for all notifier is finish, and then start the streaming service.
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// 3. The caller should call the notifier finish method, after the caller see notification and finish its work.
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RegisterStreamingEnabledNotifier(notifier *syncutil.AsyncTaskNotifier[struct{}])
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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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