diff --git a/drainer/util.go b/drainer/util.go
index 3f61f7657..ec9d85a61 100644
--- a/drainer/util.go
+++ b/drainer/util.go
@@ -44,7 +44,9 @@ import (
 
 const (
 	maxKafkaMsgSize = 1 << 30
-	maxGrpcMsgSize  = int(^uint(0) >> 1)
+	// max grpc message size, leave 4MB as buffer. Because when grpc decompresses messages, it will leave a few buffer
+	// for this, which overflows the int64: https://github.com/grpc/grpc-go/blob/v1.44.0/rpc_util.go#L742
+	maxGrpcMsgSize = int(^uint(0)>>1) - 4*1024*1024
 )
 
 // taskGroup is a wrapper of `sync.WaitGroup`.
diff --git a/pump/config.go b/pump/config.go
index ced2cfdd6..313cc6a9b 100644
--- a/pump/config.go
+++ b/pump/config.go
@@ -32,10 +32,12 @@ import (
 )
 
 const (
-	defaultEtcdDialTimeout   = 5 * time.Second
-	defaultEtcdURLs          = "http://127.0.0.1:2379"
-	defaultListenAddr        = "127.0.0.1:8250"
-	defaultMaxMsgSize        = int(^uint(0) >> 1) // max grpc message size
+	defaultEtcdDialTimeout = 5 * time.Second
+	defaultEtcdURLs        = "http://127.0.0.1:2379"
+	defaultListenAddr      = "127.0.0.1:8250"
+	// max grpc message size, leave 4MB as buffer. Because when grpc decompresses messages, it will leave a few buffer
+	// for this, which overflows the int64: https://github.com/grpc/grpc-go/blob/v1.44.0/rpc_util.go#L742
+	defaultMaxMsgSize        = int(^uint(0)>>1) - 4*1024*1024
 	defaultHeartbeatInterval = 2
 	defaultGC                = "7"
 	defaultDataDir           = "data.pump"
diff --git a/tests/cache_table/run.sh b/tests/cache_table/run.sh
index 0c2696df0..48ae47eda 100644
--- a/tests/cache_table/run.sh
+++ b/tests/cache_table/run.sh
@@ -4,7 +4,7 @@ set -e
 
 cd "$(dirname "$0")"
 
-run_drainer &
+run_drainer --compressor gzip &
 
 sleep 3