[misc](config) adjust disk resourse limit mode entrance threshold (#4…

…3779)

File cache storage will take extra space because of file page alignment.
Lower the configuration to make the disk space alert silent.

be/src/common/config.cpp

@@ -1032,7 +1032,7 @@ DEFINE_Int64(file_cache_each_block_size, "1048576"); // 1MB
 
 DEFINE_Bool(clear_file_cache, "false");
 DEFINE_Bool(enable_file_cache_query_limit, "false");
-DEFINE_mInt32(file_cache_enter_disk_resource_limit_mode_percent, "90");
+DEFINE_mInt32(file_cache_enter_disk_resource_limit_mode_percent, "88");
 DEFINE_mInt32(file_cache_exit_disk_resource_limit_mode_percent, "80");
 DEFINE_mBool(enable_read_cache_file_directly, "false");
 DEFINE_mBool(file_cache_enable_evict_from_other_queue_by_size, "true");