diff --git a/dbms/src/Storages/MergeTree/MergeTreeData.cpp b/dbms/src/Storages/MergeTree/MergeTreeData.cpp
index b99ac827d1f..8a5aae72925 100644
--- a/dbms/src/Storages/MergeTree/MergeTreeData.cpp
+++ b/dbms/src/Storages/MergeTree/MergeTreeData.cpp
@@ -2227,11 +2227,6 @@ MergeTreeData::DataPartsVector MergeTreeData::getDataPartsVector(const DataPartS
                 (*out_states)[i] = res[i]->state;
         }
     }
-    std::cerr << "NOT INITIALIZED DATA PART\n";
-    for (auto part : res) {
-        std::cerr << "FullPath:" << part->getFullPath() << std::endl;
-        std::cerr << "MarkSFileExtensSion:" << part->marks_file_extension << std::endl;
-    }
 
     return res;
 }
diff --git a/dbms/src/Storages/MergeTree/MergeTreeReader.cpp b/dbms/src/Storages/MergeTree/MergeTreeReader.cpp
index df46d25bef8..0dd21612090 100644
--- a/dbms/src/Storages/MergeTree/MergeTreeReader.cpp
+++ b/dbms/src/Storages/MergeTree/MergeTreeReader.cpp
@@ -273,6 +273,8 @@ void MergeTreeReader::Stream::loadMarks()
 
         size_t file_size = Poco::File(path).getSize();
         size_t expected_file_size = one_mark_bytes_size * marks_count;
+        std::cerr << "Marks size in bytes:" << one_mark_bytes_size << std::endl;
+        std::cerr << "Makrs count:" << marks_count << std::endl;
         if (expected_file_size != file_size)
             throw Exception(
                 "bad size of marks file `" + path + "':" + std::to_string(file_size) + ", must be: " + std::to_string(expected_file_size),
diff --git a/dbms/src/Storages/MergeTree/MergedBlockOutputStream.cpp b/dbms/src/Storages/MergeTree/MergedBlockOutputStream.cpp
index 0185b78b7ca..7d51cf3895c 100644
--- a/dbms/src/Storages/MergeTree/MergedBlockOutputStream.cpp
+++ b/dbms/src/Storages/MergeTree/MergedBlockOutputStream.cpp
@@ -39,12 +39,14 @@ IMergedBlockOutputStream::IMergedBlockOutputStream(
     , max_compress_block_size(max_compress_block_size_)
     , aio_threshold(aio_threshold_)
     , compression_settings(compression_settings_)
-    , index_granularity(index_granularity_)
     , marks_file_extension(storage.index_granularity_bytes == 0 ? FIXED_MARKS_FILE_EXTENSION : ADAPTIVE_MARKS_FILE_EXTENSION)
     , mark_size_in_bytes(storage.index_granularity_bytes == 0 ? FIXED_MARK_BYTE_SIZE : ADAPTIVE_MARK_BYTE_SIZE)
     , blocks_are_granules_size(blocks_are_granules_size_)
+    , index_granularity(index_granularity_)
     , compute_granularity(index_granularity.empty())
 {
+    if (blocks_are_granules_size && !index_granularity.empty())
+        throw Exception("Can't take information about index granularity from blocks, when non empty index_granularity specified", ErrorCodes::LOGICAL_ERROR);
 }