sql: change query ID type from string to Uint128

pkg/sql/executor.go

@@ -330,29 +330,36 @@ type DistSQLPlannerTestingKnobs struct {
 
 // QueryRegistry holds a map of all queries executing with this node as its gateway.
 type QueryRegistry struct {
+	// TODO(peter): Investigate if it is worthwhile to shard based on the query
+	// ID in order to reduce contention on this lock.
 	syncutil.Mutex
-	store map[string]*queryMeta
+	store map[uint128.Uint128]*queryMeta
 }
 
 // MakeQueryRegistry instantiates a new, empty query registry.
 func MakeQueryRegistry() *QueryRegistry {
-	return &QueryRegistry{store: make(map[string]*queryMeta)}
+	return &QueryRegistry{store: make(map[uint128.Uint128]*queryMeta)}
 }
 
-func (r *QueryRegistry) register(queryID string, query *queryMeta) {
+func (r *QueryRegistry) register(queryID uint128.Uint128, query *queryMeta) {
 	r.Lock()
-	defer r.Unlock()
 	r.store[queryID] = query
+	r.Unlock()
 }
 
-func (r *QueryRegistry) deregister(queryID string) {
+func (r *QueryRegistry) deregister(queryID uint128.Uint128) {
 	r.Lock()
-	defer r.Unlock()
 	delete(r.store, queryID)
+	r.Unlock()
 }
 
 // Cancel looks up the associated query in the registry and cancels it (if it is cancellable).
-func (r *QueryRegistry) Cancel(queryID string, username string) (bool, error) {
+func (r *QueryRegistry) Cancel(queryIDStr string, username string) (bool, error) {
+	queryID, err := uint128.FromString(queryIDStr)
+	if err != nil {
+		return false, fmt.Errorf("query ID %s malformed: %s", queryID, err)
+	}
+
 	r.Lock()
 	defer r.Unlock()
 
@@ -1084,7 +1091,7 @@ func (e *Executor) execStmtsInCurrentTxn(
 
 		txnState.schemaChangers.curStatementIdx = i
 
-		queryID := e.generateQueryID().GetString()
+		queryID := e.generateQueryID()
 
 		queryMeta := &queryMeta{
 			start: session.phaseTimes[sessionEndParse],
@@ -1100,7 +1107,7 @@ func (e *Executor) execStmtsInCurrentTxn(
 		queryMeta.ctx = session.Ctx()
 
 		session.addActiveQuery(queryID, queryMeta)
-		defer session.removeActiveQuery(stmt.queryID)
+		defer session.removeActiveQuery(queryID)
 		e.cfg.QueryRegistry.register(queryID, queryMeta)
 		defer e.cfg.QueryRegistry.deregister(queryID)
 

pkg/sql/prepare.go

@@ -27,6 +27,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/sql/parser"
 	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
 	"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
+	"github.com/cockroachdb/cockroach/pkg/util/uint128"
 )
 
 // PreparedStatement is a SQL statement that has been parsed and the types
@@ -61,7 +62,7 @@ func (p *PreparedStatement) close(ctx context.Context, s *Session) {
 type Statement struct {
 	AST           parser.Statement
 	ExpectedTypes sqlbase.ResultColumns
-	queryID       string
+	queryID       uint128.Uint128
 	queryMeta     *queryMeta
 }
 

pkg/sql/run_control.go

@@ -66,7 +66,7 @@ func (n *cancelQueryNode) Start(params runParams) error {
 
 	request := &serverpb.CancelQueryRequest{
 		NodeId:   fmt.Sprintf("%d", nodeID),
-		QueryID:  queryID.GetString(),
+		QueryID:  queryIDString,
 		Username: n.p.session.User,
 	}
 
@@ -76,7 +76,7 @@ func (n *cancelQueryNode) Start(params runParams) error {
 	}
 
 	if !response.Cancelled {
-		return fmt.Errorf("Could not cancel query %s: %s", queryID.GetString(), response.Error)
+		return fmt.Errorf("Could not cancel query %s: %s", queryID, response.Error)
 	}
 
 	return nil

pkg/sql/session.go

@@ -49,6 +49,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/util/syncutil"
 	"github.com/cockroachdb/cockroach/pkg/util/timeutil"
 	"github.com/cockroachdb/cockroach/pkg/util/tracing"
+	"github.com/cockroachdb/cockroach/pkg/util/uint128"
 	"github.com/cockroachdb/cockroach/pkg/util/uuid"
 )
 
@@ -318,7 +319,7 @@ type Session struct {
 		//
 
 		// ActiveQueries contains all queries in flight.
-		ActiveQueries map[string]*queryMeta
+		ActiveQueries map[uint128.Uint128]*queryMeta
 	}
 
 	//
@@ -441,7 +442,7 @@ func NewSession(
 	s.PreparedStatements = makePreparedStatements(s)
 	s.PreparedPortals = makePreparedPortals(s)
 	s.Tracing.session = s
-	s.mu.ActiveQueries = make(map[string]*queryMeta)
+	s.mu.ActiveQueries = make(map[uint128.Uint128]*queryMeta)
 
 	remoteStr := "<admin>"
 	if remote != nil {
@@ -649,7 +650,7 @@ func (s *Session) setTestingVerifyMetadata(fn func(config.SystemConfig) error) {
 
 // addActiveQuery adds a running query to the session's internal store of active
 // queries. Called from executor's execStmt and execStmtInParallel.
-func (s *Session) addActiveQuery(queryID string, queryMeta *queryMeta) {
+func (s *Session) addActiveQuery(queryID uint128.Uint128, queryMeta *queryMeta) {
 	s.mu.Lock()
 	s.mu.ActiveQueries[queryID] = queryMeta
 	queryMeta.session = s
@@ -658,15 +659,15 @@ func (s *Session) addActiveQuery(queryID string, queryMeta *queryMeta) {
 
 // removeActiveQuery removes a query from a session's internal store of active
 // queries. Called when a query finishes execution.
-func (s *Session) removeActiveQuery(queryID string) {
+func (s *Session) removeActiveQuery(queryID uint128.Uint128) {
 	s.mu.Lock()
 	delete(s.mu.ActiveQueries, queryID)
 	s.mu.Unlock()
 }
 
 // setQueryExecutionMode is called upon start of execution of a query, and sets
 // the query's metadata to indicate whether it's distributed or not.
-func (s *Session) setQueryExecutionMode(queryID string, isDistributed bool) {
+func (s *Session) setQueryExecutionMode(queryID uint128.Uint128, isDistributed bool) {
 	s.mu.Lock()
 	queryMeta := s.mu.ActiveQueries[queryID]
 	queryMeta.phase = executing
@@ -708,7 +709,7 @@ func (s *Session) serialize() serverpb.Session {
 			sql += "…"
 		}
 		activeQueries = append(activeQueries, serverpb.ActiveQuery{
-			ID:            id,
+			ID:            id.String(),
 			Start:         query.start.UTC(),
 			Sql:           sql,
 			IsDistributed: query.isDistributed,

pkg/util/uint128/uint128.go

@@ -37,8 +37,8 @@ func (u Uint128) GetBytes() []byte {
 	return buf
 }
 
-// GetString returns a hexadecimal string representation.
-func (u Uint128) GetString() string {
+// String returns a hexadecimal string representation.
+func (u Uint128) String() string {
 	return hex.EncodeToString(u.GetBytes())
 }
 

pkg/util/uint128/uint128_test.go

@@ -37,7 +37,7 @@ func TestString(t *testing.T) {
 
 	i, _ := FromString(s)
 
-	if s != i.GetString() {
+	if s != i.String() {
 		t.Errorf("incorrect string representation for num: %v", i)
 	}
 }