randomize default spilling root (#6781)

Author: gridnevvvit

ydb/core/kqp/proxy_service/kqp_proxy_service.cpp

@@ -44,7 +44,7 @@
 #include <library/cpp/lwtrace/mon/mon_lwtrace.h>
 #include <library/cpp/monlib/service/pages/templates.h>
 #include <library/cpp/resource/resource.h>
-
+#include <util/generic/guid.h>
 
 namespace NKikimr::NKqp {
 
@@ -234,9 +234,14 @@ class TKqpProxyService : public TActorBootstrapped<TKqpProxyService> {
         WhiteBoardService = NNodeWhiteboard::MakeNodeWhiteboardServiceId(SelfId().NodeId());
 
         if (auto& cfg = TableServiceConfig.GetSpillingServiceConfig().GetLocalFileConfig(); cfg.GetEnable()) {
+            TString spillingRoot = cfg.GetRoot();
+            if (spillingRoot.empty()) {
+                spillingRoot = TStringBuilder() << "/tmp/ydb_spilling_" << CreateGuidAsString() << "/";
+            }
+
             SpillingService = TlsActivationContext->ExecutorThread.RegisterActor(NYql::NDq::CreateDqLocalFileSpillingService(
                 NYql::NDq::TFileSpillingServiceConfig{
-                    .Root = cfg.GetRoot(),
+                    .Root = spillingRoot,
                     .MaxTotalSize = cfg.GetMaxTotalSize(),
                     .MaxFileSize = cfg.GetMaxFileSize(),
                     .MaxFilePartSize = cfg.GetMaxFilePartSize(),

ydb/core/protos/table_service_config.proto

@@ -48,7 +48,7 @@ message TTableServiceConfig {
     message TSpillingServiceConfig {
         message TLocalFileConfig {
             optional bool Enable = 1 [default = true];
-            optional string Root = 2 [default = "/tmp/kikimr_spilling/"];
+            optional string Root = 2 [default = ""];
             optional uint64 MaxTotalSize = 3 [default = 21474836480];  // 20 GiB
             optional uint64 MaxFileSize = 4 [default = 5368709120];    // 5 GiB
             optional uint64 MaxFilePartSize = 5 [default = 104857600]; // 100 MB