Merge pull request #634 from go-redis/fix/stale-conns

Fix/stale conns

cluster.go

@@ -205,17 +205,19 @@ func (c *clusterNodes) Close() error {
 	return firstErr
 }
 
-func (c *clusterNodes) Err() error {
+func (c *clusterNodes) Addrs() ([]string, error) {
 	c.mu.RLock()
-	defer c.mu.RUnlock()
+	closed := c.closed
+	addrs := c.addrs
+	c.mu.RUnlock()
 
-	if c.closed {
+	if closed {
-		return pool.ErrClosed
+		return nil, pool.ErrClosed
 	}
-	if len(c.addrs) == 0 {
+	if len(addrs) == 0 {
-		return errClusterNoNodes
+		return nil, errClusterNoNodes
 	}
-	return nil
+	return addrs, nil
 }
 
 func (c *clusterNodes) NextGeneration() uint32 {
@@ -298,16 +300,9 @@ func (c *clusterNodes) GetOrCreate(addr string) (*clusterNode, error) {
 }
 
 func (c *clusterNodes) Random() (*clusterNode, error) {
-	c.mu.RLock()
+	addrs, err := c.Addrs()
-	closed := c.closed
+	if err != nil {
-	addrs := c.addrs
+		return nil, err
-	c.mu.RUnlock()
-
-	if closed {
-		return nil, pool.ErrClosed
-	}
-	if len(addrs) == 0 {
-		return nil, errClusterNoNodes
 	}
 
 	var nodeErr error
@@ -504,7 +499,8 @@ func (c *ClusterClient) state() (*clusterState, error) {
 		return v.(*clusterState), nil
 	}
 
-	if err := c.nodes.Err(); err != nil {
+	_, err := c.nodes.Addrs()
+	if err != nil {
 		return nil, err
 	}
 
@@ -808,8 +804,10 @@ func (c *ClusterClient) PoolStats() *PoolStats {
 		acc.Requests += s.Requests
 		acc.Hits += s.Hits
 		acc.Timeouts += s.Timeouts
+
 		acc.TotalConns += s.TotalConns
 		acc.FreeConns += s.FreeConns
+		acc.StaleConns += s.StaleConns
 	}
 
 	for _, node := range state.slaves {
@@ -817,8 +815,10 @@ func (c *ClusterClient) PoolStats() *PoolStats {
 		acc.Requests += s.Requests
 		acc.Hits += s.Hits
 		acc.Timeouts += s.Timeouts
+
 		acc.TotalConns += s.TotalConns
 		acc.FreeConns += s.FreeConns
+		acc.StaleConns += s.StaleConns
 	}
 
 	return &acc
@@ -877,21 +877,12 @@ func (c *ClusterClient) reaper(idleCheckFrequency time.Duration) {
 			break
 		}
 
-		var n int
 		for _, node := range nodes {
-			nn, err := node.Client.connPool.(*pool.ConnPool).ReapStaleConns()
+			_, err := node.Client.connPool.(*pool.ConnPool).ReapStaleConns()
 			if err != nil {
 				internal.Logf("ReapStaleConns failed: %s", err)
-			} else {
-				n += nn
 			}
 		}
-
-		s := c.PoolStats()
-		internal.Logf(
-			"reaper: removed %d stale conns (TotalConns=%d FreeConns=%d Requests=%d Hits=%d Timeouts=%d)",
-			n, s.TotalConns, s.FreeConns, s.Requests, s.Hits, s.Timeouts,
-		)
 	}
 }
 

internal/pool/pool.go

@@ -27,8 +27,9 @@ type Stats struct {
 	Hits     uint32 // number of times free connection was found in the pool
 	Timeouts uint32 // number of times a wait timeout occurred
 
-	TotalConns uint32 // the number of total connections in the pool
+	TotalConns uint32 // number of total connections in the pool
-	FreeConns  uint32 // the number of free connections in the pool
+	FreeConns  uint32 // number of free connections in the pool
+	StaleConns uint32 // number of stale connections removed from the pool
 }
 
 type Pooler interface {
@@ -268,8 +269,10 @@ func (p *ConnPool) Stats() *Stats {
 		Requests: atomic.LoadUint32(&p.stats.Requests),
 		Hits:     atomic.LoadUint32(&p.stats.Hits),
 		Timeouts: atomic.LoadUint32(&p.stats.Timeouts),
+
 		TotalConns: uint32(p.Len()),
 		FreeConns:  uint32(p.FreeLen()),
+		StaleConns: atomic.LoadUint32(&p.stats.StaleConns),
 	}
 }
 
@@ -362,10 +365,6 @@ func (p *ConnPool) reaper(frequency time.Duration) {
 			internal.Logf("ReapStaleConns failed: %s", err)
 			continue
 		}
-		s := p.Stats()
+		atomic.AddUint32(&p.stats.StaleConns, uint32(n))
-		internal.Logf(
-			"reaper: removed %d stale conns (TotalConns=%d FreeConns=%d Requests=%d Hits=%d Timeouts=%d)",
-			n, s.TotalConns, s.FreeConns, s.Requests, s.Hits, s.Timeouts,
-		)
 	}
 }

main_test.go

@@ -3,7 +3,6 @@ package redis_test
 import (
 	"errors"
 	"fmt"
-	"log"
 	"net"
 	"os"
 	"os/exec"
@@ -51,10 +50,6 @@ var cluster = &clusterScenario{
 	clients:   make(map[string]*redis.Client, 6),
 }
 
-func init() {
-	redis.SetLogger(log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile))
-}
-
 var _ = BeforeSuite(func() {
 	var err error
 

options.go

@@ -205,6 +205,7 @@ type PoolStats struct {
 	Hits     uint32 // number of times free connection was found in the pool
 	Timeouts uint32 // number of times a wait timeout occurred
 
-	TotalConns uint32 // the number of total connections in the pool
+	TotalConns uint32 // number of total connections in the pool
-	FreeConns  uint32 // the number of free connections in the pool
+	FreeConns  uint32 // number of free connections in the pool
+	StaleConns uint32 // number of stale connections removed from the pool
 }

redis.go

@@ -3,6 +3,7 @@ package redis
 import (
 	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"github.com/go-redis/redis/internal"
@@ -13,6 +14,10 @@ import (
 // Redis nil reply, .e.g. when key does not exist.
 const Nil = internal.Nil
 
+func init() {
+	SetLogger(log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile))
+}
+
 func SetLogger(logger *log.Logger) {
 	internal.Logger = logger
 }

sentinel.go

@@ -301,8 +301,10 @@ func (d *sentinelFailover) listen(sentinel *sentinelClient) {
 
 		msg, err := pubsub.ReceiveMessage()
 		if err != nil {
+			if err != pool.ErrClosed {
 				internal.Logf("sentinel: ReceiveMessage failed: %s", err)
 				pubsub.Close()
+			}
 			d.resetSentinel()
 			return
 		}