Make MAXIMUM_SEED_SIZE_MIB configurable

.changes/unreleased/Features-20230307-134838.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Make MAXIMUM_SEED_SIZE_MIB configurable
+time: 2023-03-07T13:48:38.792321024Z
+custom:
+  Author: noppaz acurtis-evi
+  Issue: 7117 7124

core/dbt/artifacts/resources/base.py

@@ -3,6 +3,7 @@
 from typing import List, Optional
 
 from dbt.artifacts.resources.types import NodeType
+from dbt_common.clients.system import convert_path
 from dbt_common.dataclass_schema import dbtClassMixin
 
 
@@ -60,6 +61,27 @@
         checksum = hashlib.new(name, data).hexdigest()
         return cls(name=name, checksum=checksum)
 
+    @classmethod
+    def from_path(cls, path: str, name="sha256") -> "FileHash":
+        """Create a file hash from the file at given path. The hash is always the
+        utf-8 encoding of the contents which is stripped to give similar hashes
+        as `FileHash.from_contents`.
+        """
+        path = convert_path(path)
+        chunk_size = 1 * 1024 * 1024
+        file_hash = hashlib.new(name)
+        with open(path, "r") as handle:
+            # Left and rightstrip start and end of contents to give identical
+            # results as the seed hashing implementation with from_contents
+            chunk = handle.read(chunk_size).lstrip()
+            while chunk:
+                next_chunk = handle.read(chunk_size)
+                if not next_chunk:
+                    chunk = chunk.rstrip()
+                file_hash.update(chunk.encode("utf-8"))
+                chunk = next_chunk
+        return cls(name=name, checksum=file_hash.hexdigest())
+
 
 @dataclass
 class Docs(dbtClassMixin):

core/dbt/cli/main.py

@@ -118,6 +118,7 @@ def global_flags(func):
     @p.log_level_file
     @p.log_path
     @p.macro_debugging
+    @p.maximum_seed_size_mib
     @p.partial_parse
     @p.partial_parse_file_path
     @p.partial_parse_file_diff

core/dbt/cli/params.py

@@ -167,6 +167,14 @@
     default="eager",
 )
 
+maximum_seed_size_mib = click.option(
+    "--maximum-seed-size-mib",
+    envvar="DBT_MAXIMUM_SEED_SIZE_MIB",
+    help="Specify max size (MiB) for seed files that will be hashed for state comparison.",
+    type=click.INT,
+    default=1,
+)
+
 lock = click.option(
     "--lock",
     envvar=None,

core/dbt/constants.py

@@ -4,9 +4,6 @@
 
 SECRET_PLACEHOLDER = "$$$DBT_SECRET_START$$${}$$$DBT_SECRET_END$$$"
 
-MAXIMUM_SEED_SIZE = 1 * 1024 * 1024
-MAXIMUM_SEED_SIZE_NAME = "1MB"
-
 PIN_PACKAGE_URL = (
     "https://docs.getdbt.com/docs/package-management#section-specifying-package-versions"
 )

core/dbt/contracts/files.py

@@ -5,7 +5,6 @@
 from mashumaro.types import SerializableType
 
 from dbt.artifacts.resources.base import FileHash
-from dbt.constants import MAXIMUM_SEED_SIZE
 from dbt_common.dataclass_schema import StrEnum, dbtClassMixin
 
 from .util import SourceKey
@@ -65,9 +64,8 @@
     def original_file_path(self) -> str:
         return os.path.join(self.searched_path, self.relative_path)
 
-    def seed_too_large(self) -> bool:
-        """Return whether the file this represents is over the seed size limit"""
-        return os.stat(self.full_path).st_size > MAXIMUM_SEED_SIZE
+    def file_size(self) -> int:
+        return os.stat(self.full_path).st_size
 
 
 @dataclass

core/dbt/contracts/project.py

@@ -324,6 +324,7 @@ class ProjectFlags(ExtensibleDbtClassMixin):
     log_format_file: Optional[str] = None
     log_level: Optional[str] = None
     log_level_file: Optional[str] = None
+    maximum_seed_size_mib: Optional[int] = None
     partial_parse: Optional[bool] = None
     populate_cache: Optional[bool] = None
     printer_width: Optional[int] = None

core/dbt/events/types.py

@@ -1,13 +1,14 @@
 import json
 
-from dbt.constants import MAXIMUM_SEED_SIZE_NAME, PIN_PACKAGE_URL
+from dbt.constants import PIN_PACKAGE_URL
 from dbt.events.base_types import (
     DebugLevel,
     DynamicLevel,
     ErrorLevel,
     InfoLevel,
     WarnLevel,
 )
+from dbt.flags import get_flags
 from dbt_common.events.base_types import EventLevel
 from dbt_common.events.format import (
     format_fancy_output_line,
@@ -675,10 +676,11 @@ def code(self) -> str:
         return "I052"
 
     def message(self) -> str:
+        maximum_seed_size_name = str(get_flags().MAXIMUM_SEED_SIZE_MIB) + "MiB"
         msg = (
             f"Found a seed ({self.package_name}.{self.name}) "
-            f">{MAXIMUM_SEED_SIZE_NAME} in size. The previous file was "
-            f"<={MAXIMUM_SEED_SIZE_NAME}, so it has changed"
+            f">{maximum_seed_size_name} in size. The previous file was "
+            f"<={maximum_seed_size_name}, so it has changed"
         )
         return msg
 
@@ -688,9 +690,10 @@ def code(self) -> str:
         return "I053"
 
     def message(self) -> str:
+        maximum_seed_size_name = str(get_flags().MAXIMUM_SEED_SIZE_MIB) + "MiB"
         msg = (
             f"Found a seed ({self.package_name}.{self.name}) "
-            f">{MAXIMUM_SEED_SIZE_NAME} in size at the same path, dbt "
+            f">{maximum_seed_size_name} in size at the same path, dbt "
             f"cannot tell if it has changed: assuming they are the same"
         )
         return msg
@@ -701,9 +704,10 @@ def code(self) -> str:
         return "I054"
 
     def message(self) -> str:
+        maximum_seed_size_name = str(get_flags().MAXIMUM_SEED_SIZE_MIB) + "MiB"
         msg = (
             f"Found a seed ({self.package_name}.{self.name}) "
-            f">{MAXIMUM_SEED_SIZE_NAME} in size. The previous file was in "
+            f">{maximum_seed_size_name} in size. The previous file was in "
             f"a different location, assuming it has changed"
         )
         return msg
@@ -714,9 +718,10 @@ def code(self) -> str:
         return "I055"
 
     def message(self) -> str:
+        maximum_seed_size_name = str(get_flags().MAXIMUM_SEED_SIZE_MIB) + "MiB"
         msg = (
             f"Found a seed ({self.package_name}.{self.name}) "
-            f">{MAXIMUM_SEED_SIZE_NAME} in size. The previous file had a "
+            f">{maximum_seed_size_name} in size. The previous file had a "
             f"checksum type of {self.checksum_name}, so it has changed"
         )
         return msg

core/dbt/flags.py

@@ -69,6 +69,7 @@ def get_flag_dict():
         "log_path",
         "invocation_command",
         "empty",
+        "maximum_seed_size_mib",
     }
     return {key: getattr(GLOBAL_FLAGS, key.upper(), None) for key in flag_attr}
 

core/dbt/parser/read_files.py

@@ -17,6 +17,7 @@
 )
 from dbt.events.types import InputFileDiffError
 from dbt.exceptions import ParsingError
+from dbt.flags import get_flags
 from dbt.parser.common import schema_file_keys
 from dbt.parser.schemas import yaml_from_file
 from dbt.parser.search import filesystem_search
@@ -123,12 +124,14 @@
 
 # Special processing for big seed files
 def load_seed_source_file(match: FilePath, project_name) -> SourceFile:
-    if match.seed_too_large():
+    # Users can configure the maximum seed size (MiB) that will be hashed for state comparison
+    maximum_seed_size = get_flags().MAXIMUM_SEED_SIZE_MIB * 1024 * 1024
+    # maximum_seed_size = 0 means no limit
+    if match.file_size() > maximum_seed_size and maximum_seed_size != 0:
         # We don't want to calculate a hash of this file. Use the path.
         source_file = SourceFile.big_seed(match)
     else:
-        file_contents = load_file_contents(match.absolute_path, strip=True)
-        checksum = FileHash.from_contents(file_contents)
+        checksum = FileHash.from_path(match.absolute_path)
         source_file = SourceFile(path=match, checksum=checksum)
         source_file.contents = ""
     source_file.parse_file_type = ParseFileType.Seed

tests/unit/graph/test_selector_methods.py

@@ -780,7 +780,7 @@ def test_select_state_changed_seed_checksum_path_to_path(manifest, previous_stat
         event = warn_or_error_patch.call_args[0][0]
         assert type(event).__name__ == "SeedExceedsLimitSamePath"
         msg = event.message()
-        assert msg.startswith("Found a seed (pkg.seed) >1MB in size")
+        assert msg.startswith("Found a seed (pkg.seed) >1MiB in size")
     with mock.patch("dbt.contracts.graph.nodes.warn_or_error") as warn_or_error_patch:
         assert not search_manifest_using_method(manifest, method, "new")
         warn_or_error_patch.assert_not_called()
@@ -793,7 +793,7 @@ def test_select_state_changed_seed_checksum_path_to_path(manifest, previous_stat
         event = warn_or_error_patch.call_args[0][0]
         assert type(event).__name__ == "SeedExceedsLimitSamePath"
         msg = event.message()
-        assert msg.startswith("Found a seed (pkg.seed) >1MB in size")
+        assert msg.startswith("Found a seed (pkg.seed) >1MiB in size")
 
 
 def test_select_state_changed_seed_checksum_sha_to_path(manifest, previous_state, seed):
@@ -807,7 +807,7 @@ def test_select_state_changed_seed_checksum_sha_to_path(manifest, previous_state
         event = warn_or_error_patch.call_args[0][0]
         assert type(event).__name__ == "SeedIncreased"
         msg = event.message()
-        assert msg.startswith("Found a seed (pkg.seed) >1MB in size")
+        assert msg.startswith("Found a seed (pkg.seed) >1MiB in size")
     with mock.patch("dbt.contracts.graph.nodes.warn_or_error") as warn_or_error_patch:
         assert not search_manifest_using_method(manifest, method, "new")
         warn_or_error_patch.assert_not_called()
@@ -820,7 +820,7 @@ def test_select_state_changed_seed_checksum_sha_to_path(manifest, previous_state
         event = warn_or_error_patch.call_args[0][0]
         assert type(event).__name__ == "SeedIncreased"
         msg = event.message()
-        assert msg.startswith("Found a seed (pkg.seed) >1MB in size")
+        assert msg.startswith("Found a seed (pkg.seed) >1MiB in size")
 
 
 def test_select_state_changed_seed_checksum_path_to_sha(manifest, previous_state, seed):