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syntax = "proto3";
package deadlock;
import "gogoproto/gogo.proto";
message WaitForEntriesRequest {
}
message WaitForEntriesResponse {
repeated WaitForEntry entries = 1 [(gogoproto.nullable) = false];
}
message WaitForEntry {
// The transaction id that is waiting.
uint64 txn = 1;
// The transaction id that is being waited for.
uint64 wait_for_txn = 2;
// The hash value of the key is being waited for.
uint64 key_hash = 3;
// The key the current txn is trying to lock.
bytes key = 4;
// The tag came from the lock request's context.
bytes resource_group_tag = 5;
// Milliseconds it has been waits.
uint64 wait_time = 6;
}
enum DeadlockRequestType {
Detect = 0;
// CleanUpWaitFor cleans a single entry the transaction is waiting.
CleanUpWaitFor = 1;
// CleanUp cleans all entries the transaction is waiting.
CleanUp = 2;
}
message DeadlockRequest {
DeadlockRequestType tp = 1;
WaitForEntry entry = 2 [(gogoproto.nullable) = false];
}
message DeadlockResponse {
// The same entry sent by DeadlockRequest, identifies the sender.
WaitForEntry entry = 1 [(gogoproto.nullable) = false];
// The key hash of the lock that is hold by the waiting transaction.
uint64 deadlock_key_hash = 2;
// The other entries of the dead lock circle. The current entry is in `entry` field and not
// included in this field.
repeated WaitForEntry wait_chain = 3;
}
service Deadlock {
// Get local wait for entries, should be handle by every node.
// The owner should sent this request to all members to build the complete wait for graph.
rpc GetWaitForEntries(WaitForEntriesRequest) returns (WaitForEntriesResponse) {}
// Detect should only sent to the owner. only be handled by the owner.
// The DeadlockResponse is sent back only if there is deadlock detected.
// CleanUpWaitFor and CleanUp doesn't return responses.
rpc Detect(stream DeadlockRequest) returns (stream DeadlockResponse) {}
}
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