(improvement) log a warning when importing of lz4 or snappy packages fails.

If it is not available, the driver will silently not use compression.
Not very very silently, as you will see in debug level only something like:
"No available compression types supported on both ends. locally supported: odict_keys([]). remotely supported: ['lz4', 'snappy']"

Make it a warning. I think it wouldn't be too noisy and is clear enough for the developer.

Signed-off-by: Yaniv Kaul <[email protected]>

Author: mykaul

cassandra/connection.py

@@ -64,6 +64,7 @@
 try:
     import lz4
 except ImportError:
+    log.warning("lz4 package could not be imported. LZ4 Compression will not be available")
     pass
 else:
     # The compress and decompress functions we need were moved from the lz4 to
@@ -102,6 +103,7 @@ def lz4_decompress(byts):
 try:
     import snappy
 except ImportError:
+    log.warning("snappy package could not be imported. Snappy Compression will not be available")
     pass
 else:
     # work around apparently buggy snappy decompress