add support for bitshuffle

hsds/util/dsetUtil.py

@@ -40,6 +40,7 @@
     ("H5Z_FILTER_SNAPPY", 32003, "snappy"),
     ("H5Z_FILTER_LZ4", 32004, "lz4"),
     ("H5Z_FILTER_LZ4HC", 32005, "lz4hc"),
+    ("H5Z_FILTER_BITSHUFFLE", 32008, "bitshuffle"),
     ("H5Z_FILTER_ZSTD", 32015, "zstd"),
 )
 
@@ -78,6 +79,7 @@ def getFilterItem(key):
     """
     Return filter code, id, and name, based on an id, a name or a code.
     """
+
     if key == "deflate":
         key = "gzip"  # use gzip as equivalent
     for item in FILTER_DEFS:
@@ -123,14 +125,15 @@ def getCompressionFilter(dset_json):
 def getShuffleFilter(dset_json):
     """Return shuffle filter, or None"""
     filters = getFilters(dset_json)
+    FILTER_CLASSES = ("H5Z_FILTER_SHUFFLE", "H5Z_FILTER_BITSHUFFLE")
     for filter in filters:
-        try:
-            if filter["class"] == "H5Z_FILTER_SHUFFLE":
-                log.debug(f"Shuffle filter is used: {filter}")
-                return filter
-        except KeyError:
+        if "class" not in filter:
             log.warn(f"filter option: {filter} with no class key")
             continue
+        filter_class = filter["class"]
+        if filter_class in FILTER_CLASSES:
+            return filter
+
     log.debug("Shuffle filter not used")
     return None
 
@@ -149,17 +152,21 @@ def getFilterOps(app, dset_json, item_size):
     filter_ops = {}
 
     shuffleFilter = getShuffleFilter(dset_json)
-    if shuffleFilter:
-        filter_ops["use_shuffle"] = True
+    if shuffleFilter and item_size != "H5T_VARIABLE":
+        shuffle_name = shuffleFilter["name"]
+        if shuffle_name == "shuffle":
+            filter_ops["shuffle"] = 1  # use regular shuffle
+        elif shuffle_name == "bitshuffle":
+            filter_ops["shuffle"] = 2  # use bitshuffle
+        else:
+            log.warn(f"unexpected shuffleFilter: {shuffle_name}")
+            filter_ops["shuffle"] = 0  # no shuffle
+    else:
+        filter_ops["shuffle"] = 0  # no shuffle
 
     if compressionFilter:
         if compressionFilter["class"] == "H5Z_FILTER_DEFLATE":
             filter_ops["compressor"] = "zlib"  # blosc compressor
-            if shuffleFilter:
-                filter_ops["use_shuffle"] = True
-            else:
-                # for HDF5-style compression, use shuffle only if it turned on
-                filter_ops["use_shuffle"] = False
         else:
             if "name" in compressionFilter:
                 filter_ops["compressor"] = compressionFilter["name"]
@@ -170,10 +177,7 @@ def getFilterOps(app, dset_json, item_size):
         else:
             filter_ops["level"] = int(compressionFilter["level"])
 
-    if filter_ops:
         filter_ops["item_size"] = item_size
-        if item_size == "H5T_VARIABLE":
-            filter_ops["use_shuffle"] = False
         log.debug(f"save filter ops: {filter_ops} for {dset_id}")
         filter_map[dset_id] = filter_ops  # save
         return filter_ops

hsds/util/storUtil.py

@@ -17,10 +17,11 @@
 import time
 import json
 import zlib
+import numpy as np
 import numcodecs as codecs
+from bitshuffle import bitshuffle, bitunshuffle
 from aiohttp.web_exceptions import HTTPInternalServerError
 
-
 from .. import hsds_logger as log
 from .s3Client import S3Client
 
@@ -44,6 +45,9 @@ def FileClient(app):
 
 from .. import config
 
+BYTE_SHUFFLE = 1
+BIT_SHUFFLE = 2
+
 
 def getCompressors():
     """return available compressors"""
@@ -65,6 +69,7 @@ def getCompressors():
 def getSupportedFilters(include_compressors=True):
     """return list of other supported filters"""
     filters = [
+        "bitshuffle",
         "shuffle",
         "fletcher32",
     ]
@@ -85,18 +90,118 @@ def getBloscThreads():
     return nthreads
 
 
-def _shuffle(element_size, chunk):
-    shuffler = codecs.Shuffle(element_size)
-    arr = shuffler.encode(chunk)
+def _shuffle(codec, data, item_size=4):
+    if codec == 1:
+        # byte shuffle, use numcodecs Shuffle
+        shuffler = codecs.Shuffle(item_size)
+        arr = shuffler.encode(data)
+    elif codec == 2:
+        # bit shuffle, use bitshuffle packge
+        if isinstance(data, bytes):
+            # bitshufle is expecting numpy array
+            data = np.frombuffer(data, dtype=np.dtype("uint8"))
+        arr = bitshuffle(data)
+    else:
+        log.error(f"Unexpected codec: {codec} for _shuffle")
+        raise ValueError()
     return arr.tobytes()
 
 
-def _unshuffle(element_size, chunk):
-    shuffler = codecs.Shuffle(element_size)
-    arr = shuffler.decode(chunk)
+def _unshuffle(codec, data, item_size=4):
+    if codec == 1:
+        # byte shuffle, use numcodecs Shuffle
+        shuffler = codecs.Shuffle(item_size)
+        arr = shuffler.decode(data)
+    elif codec == 2:
+        # bit shuffle, use bitshuffle
+        if isinstance(data, bytes):
+            # bitshufle is expecting numpy array
+            data = np.frombuffer(data, dtype=np.dtype("uint8"))
+        arr = bitunshuffle(data)
+
     return arr.tobytes()
 
 
+def _uncompress(data, compressor=None, shuffle=0, item_size=4):
+    """ Uncompress the provided data using compessor and/or shuffle """
+    log.debug(f"_uncompress(compressor={compressor}, shuffle={shuffle})")
+    if compressor:
+        if compressor in ("gzip", "deflate"):
+            # blosc referes to this as zlib
+            compressor = "zlib"
+        # first check if this was compressed with blosc
+        # returns typesize, isshuffle, and memcopied
+        blosc_metainfo = codecs.blosc.cbuffer_metainfo(data)
+        if blosc_metainfo[0] > 0:
+            log.info(f"blosc compressed data for {len(data)} bytes")
+            try:
+                blosc = codecs.Blosc()
+                udata = blosc.decode(data)
+                log.info(f"blosc uncompressed to {len(udata)} bytes")
+                data = udata
+                if shuffle == BYTE_SHUFFLE:
+                    shuffle = 0  # blosc will unshuffle the bytes for us
+            except Exception as e:
+                msg = f"got exception: {e} using blosc decompression"
+                log.error(msg)
+                raise HTTPInternalServerError()
+        elif compressor == "zlib":
+            # data may have been compressed without blosc,
+            # try using zlib directly
+            log.info(f"using zlib to decompress {len(data)} bytes")
+            try:
+                udata = zlib.decompress(data)
+                log.info(f"uncompressed to {len(udata)} bytes")
+                data = udata
+            except zlib.error as zlib_error:
+                log.info(f"zlib_err: {zlib_error}")
+                log.error("unable to uncompress data with zlib")
+                raise HTTPInternalServerError()
+        else:
+            msg = f"don't know how to decompress data in {compressor} "
+            log.error(msg)
+            raise HTTPInternalServerError()
+    if shuffle:
+        start_time = time.time()
+        data = _unshuffle(shuffle, data, item_size=item_size)
+        finish_time = time.time()
+        elapsed = finish_time - start_time
+        msg = f"unshuffled {len(data)} bytes, {(elapsed):.2f} elapsed"
+        log.debug(msg)
+
+    return data
+
+
+def _compress(data, compressor=None, clevel=5, shuffle=0, item_size=4):
+    log.debug(f"_uncompress(compressor={compressor}, shuffle={shuffle})")
+    if shuffle == 2:
+        # bit shuffle the data before applying the compressor
+        log.debug("bitshuffling data")
+        data = _shuffle(shuffle, data, item_size=item_size)
+        shuffle = 0  # don't do any blosc shuffling
+
+    if compressor:
+        if compressor in ("gzip", "deflate"):
+            # blosc referes to this as zlib
+            compressor = "zlib"
+        cdata = None
+        # try with blosc compressor
+        try:
+            blosc = codecs.Blosc(cname=compressor, clevel=clevel, shuffle=shuffle)
+            cdata = blosc.encode(data)
+            msg = f"compressed from {len(data)} bytes to {len(cdata)} bytes "
+            msg += f"using filter: {blosc.cname} with level: {blosc.clevel}"
+            log.info(msg)
+        except Exception as e:
+            log.error(f"got exception using blosc encoding: {e}")
+            raise HTTPInternalServerError()
+
+        if cdata is not None:
+            data = cdata  # used compress data
+
+    return data
+
+
 def _getStorageClient(app):
     """get storage client s3 or azure blob"""
 
@@ -217,58 +322,6 @@ async def getStorJSONObj(app, key, bucket=None):
     return json_dict
 
 
-def _uncompress(data, compressor=None, shuffle=0):
-    """ Uncompress the provided data using compessor and/or shuffle """
-    if compressor:
-        # compressed chunk data...
-
-        # first check if this was compressed with blosc
-        # returns typesize, isshuffle, and memcopied
-        blosc_metainfo = codecs.blosc.cbuffer_metainfo(data)
-        if blosc_metainfo[0] > 0:
-            log.info(f"blosc compressed data for {len(data)} bytes")
-            try:
-                blosc = codecs.Blosc()
-                udata = blosc.decode(data)
-                log.info(f"uncompressed to {len(udata)} bytes")
-                data = udata
-                shuffle = 0  # blosc will unshuffle the bytes for us
-            except Exception as e:
-                msg = f"got exception: {e} using blosc decompression"
-                log.error(msg)
-                raise HTTPInternalServerError()
-        elif compressor == "zlib":
-            # data may have been compressed without blosc,
-            # try using zlib directly
-            log.info(f"using zlib to decompress {len(data)} bytes")
-            try:
-                udata = zlib.decompress(data)
-                log.info(f"uncompressed to {len(udata)} bytes")
-                data = udata
-            except zlib.error as zlib_error:
-                log.info(f"zlib_err: {zlib_error}")
-                log.error("unable to uncompress data with zlib")
-                raise HTTPInternalServerError()
-        else:
-            msg = f"don't know how to decompress data in {compressor} "
-            log.error(msg)
-            raise HTTPInternalServerError()
-
-    if shuffle > 0:
-        log.debug(f"shuffle is {shuffle}")
-        start_time = time.time()
-        unshuffled = _unshuffle(shuffle, data)
-        if unshuffled is not None:
-            log.debug(f"unshuffled to {len(unshuffled)} bytes")
-            data = unshuffled
-        finish_time = time.time()
-        elapsed = finish_time - start_time
-        msg = f"unshuffled {len(data)} bytes, {(elapsed):.2f} elapsed"
-        log.debug(msg)
-
-    return data
-
-
 async def getStorBytes(app,
                        key,
                        filter_ops=None,
@@ -294,15 +347,20 @@ async def getStorBytes(app,
     log.info(msg)
 
     shuffle = 0
+    item_size = 4
     compressor = None
     if filter_ops:
         log.debug(f"getStorBytes for {key} with filter_ops: {filter_ops}")
-        if "use_shuffle" in filter_ops and filter_ops["use_shuffle"]:
+        if filter_ops.get("shuffle") == "shuffle":
             shuffle = filter_ops["item_size"]
             log.debug("using shuffle filter")
+        elif filter_ops.get("shuffle") == "bitshuffle":
+            shuffle = 2
+            log.debug("using bitshuffle filter")
         if "compressor" in filter_ops:
             compressor = filter_ops["compressor"]
             log.debug(f"using compressor: {compressor}")
+        item_size = filter_ops["item_size"]
 
     kwargs = {"bucket": bucket, "key": key, "offset": offset, "length": length}
 
@@ -336,7 +394,8 @@ async def getStorBytes(app,
             m = n + chunk_location.length
             log.debug(f"getStorBytes - extracting chunk from data[{n}:{m}]")
             h5_bytes = data[n:m]
-            h5_bytes = _uncompress(h5_bytes, compressor=compressor, shuffle=shuffle)
+            kwargs = {"compressor": compressor, "shuffle": shuffle, "item_size": item_size}
+            h5_bytes = _uncompress(h5_bytes, **kwargs)
             if len(h5_bytes) != h5_size:
                 msg = f"expected chunk index: {chunk_location.index} to have size: "
                 msg += f"{h5_size} but got: {len(h5_bytes)}"
@@ -353,7 +412,7 @@ async def getStorBytes(app,
         # chunk_bytes got updated, so just return None
         return None
     else:
-        data = _uncompress(data, compressor=compressor, shuffle=shuffle)
+        data = _uncompress(data, compressor=compressor, shuffle=shuffle, item_size=item_size)
         return data
 
 
@@ -365,32 +424,23 @@ async def putStorBytes(app, key, data, filter_ops=None, bucket=None):
         bucket = app["bucket_name"]
     if key[0] == "/":
         key = key[1:]  # no leading slash
-    shuffle = -1  # auto-shuffle
+    shuffle = 0
     clevel = 5
     cname = None  # compressor name
+    item_size = 4
     if filter_ops:
         if "compressor" in filter_ops:
             cname = filter_ops["compressor"]
-        if "use_shuffle" in filter_ops and not filter_ops["use_shuffle"]:
-            shuffle = 0  # client indicates to turn off shuffling
+        if "shuffle" in filter_ops:
+            shuffle = filter_ops["shuffle"]
         if "level" in filter_ops:
             clevel = filter_ops["level"]
+        item_size = filter_ops["item_size"]
     msg = f"putStorBytes({bucket}/{key}), {len(data)} bytes shuffle: {shuffle}"
-    msg += f" compressor: {cname} level: {clevel}"
+    msg += f" compressor: {cname} level: {clevel}, item_size: {item_size}"
     log.info(msg)
 
-    if cname:
-        try:
-            blosc = codecs.Blosc(cname=cname, clevel=clevel, shuffle=shuffle)
-            cdata = blosc.encode(data)
-            # TBD: add cname in blosc constructor
-            msg = f"compressed from {len(data)} bytes to {len(cdata)} bytes "
-            msg += f"using filter: {blosc.cname} with level: {blosc.clevel}"
-            log.info(msg)
-            data = cdata
-        except Exception as e:
-            log.error(f"got exception using blosc encoding: {e}")
-            raise HTTPInternalServerError()
+    data = _compress(data, compressor=cname, clevel=clevel, shuffle=shuffle, item_size=item_size)
 
     rsp = await client.put_object(key, data, bucket=bucket)
 

pyproject.toml

@@ -39,6 +39,7 @@ dependencies = [
     "aiohttp_cors",
     "aiofiles",
     "azure-storage-blob",
+    "bitshuffle",
     "botocore",
     "cryptography",
     "numcodecs",

testall.py

@@ -15,7 +15,7 @@
 
 PYTHON_CMD = "python"  # change to "python3" if "python" invokes python version 2.x
 
-unit_tests = ('array_util_test', 'chunk_util_test', 'domain_util_test',
+unit_tests = ('array_util_test', 'chunk_util_test', 'compression_test', 'domain_util_test',
               'dset_util_test', 'hdf5_dtype_test', 'id_util_test', 'lru_cache_test',
               'shuffle_test', 'rangeget_util_test')