io_capacity_fix.patch

--- a/src/conn/conn_capacity.c
+++ b/src/conn/conn_capacity.c
@@ -36,7 +36,16 @@ __capacity_config(WT_SESSION_IMPL *session, const char *cfg[])
     conn = S2C(session);
     chunkcache = total = 0;
 
-    WT_RET(__wt_config_gets(session, cfg, "io_capacity.total", &cval));
+    /* 
+     * 添加配置解析错误检查
+     * 如果用户使用了错误的格式（如方括号而不是圆括号），
+     * 返回更友好的错误信息而不是crash
+     */
+    ret = __wt_config_gets(session, cfg, "io_capacity.total", &cval);
+    if (ret != 0)
+        WT_RET_MSG(session, EINVAL, 
+            "invalid io_capacity configuration format. Use 'io_capacity=(total=<value>)' "
+            "with parentheses, not brackets");
+            
     if (cval.val != 0) {
         if (cval.val < WT_THROTTLE_MIN)
             WT_RET_MSG(session, EINVAL, "total I/O capacity value %" PRId64 " below minimum %d",
@@ -44,7 +53,12 @@ __capacity_config(WT_SESSION_IMPL *session, const char *cfg[])
         total = (uint64_t)cval.val;
     }
 
-    WT_RET(__wt_config_gets(session, cfg, "io_capacity.chunk_cache", &cval));
+    ret = __wt_config_gets(session, cfg, "io_capacity.chunk_cache", &cval);
+    if (ret != 0 && ret != WT_NOTFOUND)
+        WT_RET_MSG(session, EINVAL,
+            "invalid io_capacity.chunk_cache configuration format. Use 'io_capacity=(chunk_cache=<value>)' "
+            "with parentheses, not brackets");
+            
     if (cval.val != 0) {
         chunkcache = (uint64_t)cval.val;
         if (chunkcache < WT_THROTTLE_MIN)