YQ: fix read_actor log message size / to stable (#13958)

Author: kardymonds

ydb/library/yql/providers/pq/async_io/dq_pq_rd_read_actor.cpp

@@ -114,6 +114,7 @@ class TDqPqRdReadActor : public NActors::TActor<TDqPqRdReadActor>, public NYql::
 
     const ui64 PrintStatePeriodSec = 300;
     const ui64 ProcessStatePeriodSec = 1;
+    const ui64 PrintStateToLogSplitSize = 64000;
 
     struct TReadyBatch {
     public:
@@ -869,7 +870,11 @@ void TDqPqRdReadActor::Handle(TEvPrivate::TEvPrintState::TPtr&) {
 }
 
 void TDqPqRdReadActor::PrintInternalState() {
-    SRC_LOG_I(GetInternalState());
+    auto str = GetInternalState();
+    auto buf = TStringBuf(str);
+    for (ui64 offset = 0; offset < buf.size(); offset += PrintStateToLogSplitSize) {
+        SRC_LOG_I(buf.SubString(offset, PrintStateToLogSplitSize));
+    }
 }
 
 TString TDqPqRdReadActor::GetInternalState() {