add instruction for using alluxiocommon

README.md

@@ -156,6 +156,24 @@ ds2.count()
 # End of Python example
 ```
 
+#### Enable alluxiocommon enhancement module
+
+alluxiocommon package is a native enhancement module for alluxiofs based on PyO3 rust bindings.
+Currently it enhances big reads (multi-page reads from alluxio) by issuing multi-threaded requests to alluxio.
+
+to enable it, first install alluxiocommon package:
+```
+pip install alluxiocommon
+```
+and when start the Alluxio fsspec instance, add an additional option flag:
+```
+alluxio_options = {"alluxio.common.extension.enable" : "True"}
+alluxio_fs = fsspec.filesystem(
+  "alluxiofs", etcd_hosts="localhost", target_protocol="s3",
+  options=alluxio_options
+)
+```
+
 ### Running examples with Pyarrow
 
 ```

alluxiofs/client/core.py

@@ -205,8 +205,8 @@ def __init__(
                 ALLUXIO_COMMON_EXTENSION_ENABLE in options
                 and options[ALLUXIO_COMMON_EXTENSION_ENABLE].lower() == "true"
             ):
-                print("Using alluxiocommon extension..")
-                logger.debug("alluxiocommon extension enabled.")
+                print("alluxiocommon extension enabled.")
+                logger.info("alluxiocommon extension enabled.")
                 ondemand_pool_disabled = (
                     ALLUXIO_COMMON_ONDEMANDPOOL_DISABLE in options
                     and options[ALLUXIO_COMMON_ONDEMANDPOOL_DISABLE].lower()