Increase startup timeout for TiDB 6.1.x and 6.5.x versions

Older TiDB versions (6.1.x and 6.5.x) require more time to start up
than newer versions. Increase timeout from 120 seconds to 240 seconds
(4 minutes) for these versions to prevent false test failures.

Newer versions (7.x and 8.x) continue to use 120 seconds timeout.

Author: zph

scripts/tidb-playground.sh

@@ -44,9 +44,18 @@ if [ "$MODE" = "start" ]; then
     PLAYGROUND_PID=$!
     echo $PLAYGROUND_PID > /tmp/tidb-playground-${PORT}.pid
 
-    # Wait for TiDB to be ready (max 120 seconds)
-    echo "Waiting for TiDB to be ready..."
-    for i in {1..120}; do
+    # Determine timeout based on TiDB version
+    # Versions 6.1.x and 6.5.x need longer startup time
+    if [[ "${VERSION}" == 6.1.* ]] || [[ "${VERSION}" == 6.5.* ]]; then
+        TIMEOUT=240  # 4 minutes for older versions
+        echo "Using extended timeout (240s) for TiDB ${VERSION}"
+    else
+        TIMEOUT=120  # 2 minutes for newer versions
+    fi
+    
+    # Wait for TiDB to be ready
+    echo "Waiting for TiDB to be ready (max ${TIMEOUT} seconds)..."
+    for i in $(seq 1 ${TIMEOUT}); do
         if mysql -h 127.0.0.1 -P ${PORT} -u root -e 'SELECT 1' >/dev/null 2>&1; then
             echo "TiDB is ready!"
             exit 0
@@ -58,7 +67,7 @@ if [ "$MODE" = "start" ]; then
     done
 
     echo ""
-    echo "ERROR: TiDB failed to start within 120 seconds"
+    echo "ERROR: TiDB failed to start within ${TIMEOUT} seconds"
     echo "Last 20 lines of playground log:"
     tail -20 /tmp/tidb-playground-${PORT}.log || true
     exit 1