diff --git a/argopy/data_fetchers/argovis_data_processors.py b/argopy/data_fetchers/argovis_data_processors.py
index a065c97d..30997c9b 100644
--- a/argopy/data_fetchers/argovis_data_processors.py
+++ b/argopy/data_fetchers/argovis_data_processors.py
@@ -7,6 +7,9 @@
 def pre_process(profiles: Any, key_map: dict = None) -> pd.DataFrame:
     """convert json data to Pandas DataFrame"""
 
+    if profiles is None:
+        return None
+
     # Make sure we deal with a list
     if isinstance(profiles, list):
         data = profiles
diff --git a/argopy/data_fetchers/gdac_data_processors.py b/argopy/data_fetchers/gdac_data_processors.py
index 6995f35c..7e94d8b3 100644
--- a/argopy/data_fetchers/gdac_data_processors.py
+++ b/argopy/data_fetchers/gdac_data_processors.py
@@ -23,6 +23,9 @@ def pre_process_multiprof(
     -------
     :class:`xarray.Dataset`
     """
+    if ds is None:
+        return None
+
     # Remove raw netcdf file attributes and replace them with argopy ones:
     raw_attrs = ds.attrs
     ds.attrs = {}
diff --git a/argopy/errors.py b/argopy/errors.py
index 997f826c..f00fe900 100644
--- a/argopy/errors.py
+++ b/argopy/errors.py
@@ -22,7 +22,7 @@ class DataNotFound(NoData):
 
 
 class NoDataLeft(NoData):
-    """Raise when a data post-processing returns an empty dataset or dataframe"""
+    """Raise when data processing returns an empty dataset or dataframe"""
     pass
 
 
diff --git a/argopy/stores/argo_index_pa.py b/argopy/stores/argo_index_pa.py
index 441bfeae..47ad38ec 100644
--- a/argopy/stores/argo_index_pa.py
+++ b/argopy/stores/argo_index_pa.py
@@ -99,7 +99,7 @@ def read_csv(input_file, nrows=None):
 
         def csv2index(obj):
             index = read_csv(obj, nrows=nrows)
-            log.debug(index.column_names)
+            # log.debug(index.column_names)
             check_index_cols(
                 index.column_names,
                 convention=self.convention,
diff --git a/argopy/stores/filesystems.py b/argopy/stores/filesystems.py
index 0057151f..e399d324 100644
--- a/argopy/stores/filesystems.py
+++ b/argopy/stores/filesystems.py
@@ -45,6 +45,7 @@
     FileSystemHasNoCache,
     CacheFileNotFound,
     DataNotFound,
+    NoDataLeft,
     InvalidMethod,
     ErddapHTTPUnauthorized,
     ErddapHTTPNotFound,
@@ -787,6 +788,8 @@ def open_dataset(self, url, errors: str = "raise", **kwargs) -> xr.Dataset:
         ------
         :class:`TypeError` if data returned by ``url`` are not CDF or HDF5 binary data.
 
+        :class:`DataNotFound` if ``errors`` is set to ``raise`` and url returns no data.
+
         See Also
         --------
         :class:`httpstore.open_mfdataset`
@@ -803,6 +806,13 @@ def open_dataset(self, url, errors: str = "raise", **kwargs) -> xr.Dataset:
                 log.error("DataNotFound: %s" % url)
             return None
 
+        if b'Not Found: Your query produced no matching results' in data:
+            if errors == "raise":
+                raise DataNotFound(url)
+            elif errors == "ignore":
+                log.error("DataNotFound from [%s]: %s" % (url, data))
+            return None
+
         if data[0:3] != b"CDF" and data[0:3] != b"\x89HD":
             raise TypeError(
                 "We didn't get a CDF or HDF5 binary data as expected ! We get: %s"
@@ -1411,9 +1421,7 @@ def _mfprocessor_json(
         data = self.open_json(url, **open_json_opts)
 
         # Pre-process
-        if data is None:
-            raise DataNotFound(url)
-        elif isinstance(preprocess, types.FunctionType) or isinstance(
+        if isinstance(preprocess, types.FunctionType) or isinstance(
             preprocess, types.MethodType
         ):
             if url_follow:
diff --git a/argopy/tests/test_fetchers_Dask_cluster.py b/argopy/tests/test_fetchers_Dask_cluster.py
new file mode 100644
index 00000000..e4005be2
--- /dev/null
+++ b/argopy/tests/test_fetchers_Dask_cluster.py
@@ -0,0 +1,139 @@
+import pytest
+import logging
+
+from dask.distributed import Client
+from argopy import DataFetcher
+from collections import ChainMap
+import xarray as xr
+
+from mocked_http import mocked_server_address, mocked_httpserver
+
+
+log = logging.getLogger("argopy.tests.dask")
+USE_MOCKED_SERVER = True
+
+"""
+List data sources to be tested
+"""
+SRC_LIST = ["erddap", "argovis", "gdac"]
+
+
+"""
+List access points to be tested for each datasets: phy.
+For each access points, we list 1-to-2 scenario to make sure all possibilities are tested
+"""
+PARALLEL_ACCESS_POINTS = [
+    {
+        "phy": [
+            {"region": [-60, -55, 40.0, 45.0, 0.0, 20.0, "2007-08-01", "2007-09-01"]},
+        ]
+    },
+]
+
+"""
+List user modes to be tested
+"""
+USER_MODES = ["standard"]  # Because it's the only available with argovis
+
+"""
+Make a list of VALID dataset/access_points to be tested
+"""
+VALID_PARALLEL_ACCESS_POINTS, VALID_PARALLEL_ACCESS_POINTS_IDS = [], []
+for entry in PARALLEL_ACCESS_POINTS:
+    for src in SRC_LIST:
+        for ds in entry:
+            for mode in USER_MODES:
+                for ap in entry[ds]:
+                    VALID_PARALLEL_ACCESS_POINTS.append(
+                        {"src": src, "ds": ds, "mode": mode, "access_point": ap}
+                    )
+                    VALID_PARALLEL_ACCESS_POINTS_IDS.append(
+                        "src='%s', ds='%s', mode='%s', %s" % (src, ds, mode, ap)
+                    )
+
+
+def create_fetcher(fetcher_args, access_point):
+    """Create a fetcher for a given set of facade options and access point"""
+
+    def core(fargs, apts):
+        try:
+            f = DataFetcher(**fargs)
+            if "float" in apts:
+                f = f.float(apts["float"])
+            elif "profile" in apts:
+                f = f.profile(*apts["profile"])
+            elif "region" in apts:
+                f = f.region(apts["region"])
+        except Exception:
+            raise
+        return f
+
+    fetcher = core(fetcher_args, access_point)
+    return fetcher
+
+
+class Test_Backend:
+    """Test Dask cluster parallelization"""
+
+    #############
+    # UTILITIES #
+    #############
+    def setup_class(self):
+        """setup any state specific to the execution of the given class"""
+        # Create the cache folder here, so that it's not the same for the pandas and pyarrow tests
+        self.client = Client(processes=True)
+        log.debug(self.client.dashboard_link)
+
+    def _test2fetcherargs(self, this_request):
+        """Helper method to set up options for a fetcher creation"""
+        defaults_args = {
+            "parallel": self.client,
+            "chunks_maxsize": {"lon": 2.5, "lat": 2.5},
+        }
+        if USE_MOCKED_SERVER:
+            defaults_args["server"] = mocked_server_address
+
+        src = this_request.param["src"]
+        dataset = this_request.param["ds"]
+        user_mode = this_request.param["mode"]
+        access_point = this_request.param["access_point"]
+
+        fetcher_args = ChainMap(
+            defaults_args,
+            {
+                "src": src,
+                "ds": dataset,
+                "mode": user_mode,
+            },
+        )
+
+        # log.debug("Setting up fetcher arguments:%s" % fetcher_args)
+        return fetcher_args, access_point
+
+    @pytest.fixture
+    def fetcher(self, request):
+        """Fixture to create a data fetcher for a given dataset and access point"""
+        fetcher_args, access_point = self._test2fetcherargs(request)
+        yield create_fetcher(fetcher_args, access_point)
+
+    def teardown_class(self):
+        """Cleanup once we are finished."""
+        self.client.close()
+
+    #########
+    # TESTS #
+    #########
+    @pytest.mark.parametrize(
+        "fetcher",
+        VALID_PARALLEL_ACCESS_POINTS,
+        indirect=True,
+        ids=VALID_PARALLEL_ACCESS_POINTS_IDS,
+    )
+    def test_fetching_erddap(self, mocked_httpserver, fetcher):
+        # log.debug(fetcher)
+        # log.debug(len(fetcher.uri))
+        # log.debug(fetcher.uri)
+        assert len(fetcher.uri) > 1
+
+        ds = fetcher.to_xarray()
+        assert isinstance(ds, xr.Dataset)