remove blosc warnings from n5 compressor handling (#1331)

* remove blosc warnings from n5 compressor handling

* release notes

* remove reference to n5 warnings in pytest ini options

* remove blosc from list of warned compressors in tests, and restore lzma warning

Author: d-v-b

docs/release.rst

@@ -25,7 +25,9 @@ Major changes
   * sharding storage transformer
   By :user:`Jonathan Striebel <jstriebel>`; :issue:`1096`, :issue:`1111`.
 
-
+* Remove warnings emitted when using N5Store or N5FSStore with a blosc-compressed array.
+  By :user:`Davis Bennett <d-v-b>`; :issue:`1331`.
+  
 Bug fixes
 ~~~~~~~~~
 

pyproject.toml

@@ -87,7 +87,6 @@ addopts = [
 ]
 filterwarnings = [
     "error:::zarr.*",
-    "ignore:Not all N5 implementations support blosc compression.*:RuntimeWarning",
     "ignore:PY_SSIZE_T_CLEAN will be required.*:DeprecationWarning",
     "ignore:The loop argument is deprecated since Python 3.8.*:DeprecationWarning",
 ]

zarr/n5.py

@@ -735,12 +735,6 @@ def compressor_config_to_n5(compressor_config: Optional[Dict[str, Any]]) -> Dict
 
     elif codec_id == 'blosc':
 
-        warnings.warn(
-            "Not all N5 implementations support blosc compression (yet). You "
-            "might not be able to open the dataset with another N5 library.",
-            RuntimeWarning
-        )
-
         n5_config['cname'] = _compressor_config['cname']
         n5_config['clevel'] = _compressor_config['clevel']
         n5_config['shuffle'] = _compressor_config['shuffle']

zarr/tests/test_core.py

@@ -2022,9 +2022,7 @@ def test_compressors(self):
             a1[:] = 1
             assert np.all(a1[:] == 1)
 
-        compressors_warn = [
-            Blosc()
-        ]
+        compressors_warn = []
         if LZMA:
             compressors_warn.append(LZMA(2))  # Try lzma.FORMAT_ALONE, which N5 doesn't support.
         for compressor in compressors_warn: