diff --git a/asterixdb/asterix-app/src/main/resources/entrypoint.py b/asterixdb/asterix-app/src/main/resources/entrypoint.py
index aba4f29..7bad7ef 100755
--- a/asterixdb/asterix-app/src/main/resources/entrypoint.py
+++ b/asterixdb/asterix-app/src/main/resources/entrypoint.py
@@ -246,11 +246,11 @@
                         return
                     pos += read
                 while pos < self.sz:
-                    vszchunk = sys.stdin.buffer.read1()
+                    vszchunk = sys.stdin.buffer.read1(FRAMESZ)
                     if len(vszchunk) == 0:
                         self.alive = False
                         return
-                    self.readview = None
+                    self.readview.release()
                     self.readbuf.extend(vszchunk)
                     self.readview = memoryview(self.readbuf)
                     pos += len(vszchunk)
@@ -258,7 +258,7 @@
                 self.unpacked_msg = list(self.unpacker)
                 self.msg_type = MessageType(self.unpacked_msg[0])
                 self.type_handler[self.msg_type](self)
-            except BaseException as e:
+            except BaseException:
                 self.handle_error(traceback.format_exc())
 
     def send_msg(self):
diff --git a/asterixdb/asterix-app/src/test/resources/TweetSent/roundtrip.py b/asterixdb/asterix-app/src/test/resources/TweetSent/roundtrip.py
index 9058a01..0d52f01 100644
--- a/asterixdb/asterix-app/src/test/resources/TweetSent/roundtrip.py
+++ b/asterixdb/asterix-app/src/test/resources/TweetSent/roundtrip.py
@@ -25,6 +25,9 @@
     def roundtrip(self, *args):
         return args
 
+    def roundstr(self, arg):
+        return arg
+
     def warning(self):
         raise ArithmeticError("oof")
 
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.1.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.1.ddl.sqlpp
new file mode 100644
index 0000000..abe0710
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.1.ddl.sqlpp
@@ -0,0 +1,82 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+* Description  : Create an external dataset that contains long comments fields, 10% of the records have a 32K size comments.
+*                 This will trigger into the VSizeFrame path
+* Expected Res : Success
+* Date         : Jun 16 2015
+*/
+
+drop  dataverse test if exists;
+create  dataverse test;
+
+use test;
+
+
+create type test.LineType as
+ closed {
+  l_orderkey : integer,
+  l_partkey : integer,
+  l_suppkey : integer,
+  l_linenumber : integer,
+  l_quantity : double,
+  l_extendedprice : double,
+  l_discount : double,
+  l_tax : double,
+  l_returnflag : string,
+  l_linestatus : string,
+  l_shipdate : string,
+  l_commitdate : string,
+  l_receiptdate : string,
+  l_shipinstruct : string,
+  l_shipmode : string,
+  l_comment : string
+};
+
+create type test.OrderType as
+ closed {
+  o_orderkey : integer,
+  o_custkey : integer,
+  o_orderstatus : string,
+  o_totalprice : double,
+  o_orderdate : string,
+  o_orderpriority : string,
+  o_clerk : string,
+  o_shippriority : integer,
+  o_comment : string
+};
+
+create type test.CustomerType as
+ closed {
+  c_custkey : integer,
+  c_name : string,
+  c_address : string,
+  c_nationkey : integer,
+  c_phone : string,
+  c_acctbal : double,
+  c_mktsegment : string,
+  c_comment : string
+};
+
+create external  dataset Line(LineType) using `localfs`((`path`=`asterix_nc1://data/big-object/lineitem.tbl.big`),(`input-format`=`text-input-format`),(`format`=`delimited-text`),(`delimiter`=`|`));
+
+create external  dataset `Order`(OrderType) using `localfs`((`path`=`asterix_nc1://data/big-object/order.tbl.big`),(`input-format`=`text-input-format`),(`format`=`delimited-text`),(`delimiter`=`|`));
+
+create external  dataset Customer(CustomerType) using `localfs`((`path`=`asterix_nc1://data/big-object/customer.tbl.big`),(`input-format`=`text-input-format`),(`format`=`delimited-text`),(`delimiter`=`|`));
+
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.2.update.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.2.update.sqlpp
new file mode 100644
index 0000000..00a13e7
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.2.update.sqlpp
@@ -0,0 +1,24 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+* Description  : Create an external dataset that contains long comments fields, 10% of the records have a 32K size comments.
+*                 This will trigger into the VSizeFrame path
+* Expected Res : Success
+* Date         : Jun 16 2015
+*/
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.3.lib.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.3.lib.sqlpp
new file mode 100644
index 0000000..7167161
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.3.lib.sqlpp
@@ -0,0 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+install test testlib python admin admin target/TweetSent.pyz
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.4.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.4.ddl.sqlpp
new file mode 100644
index 0000000..28d8a90
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.4.ddl.sqlpp
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+ USE test;
+
+create function roundtrip(s) as "roundtrip",
+  "Tests.roundstr" at testlib;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.5.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.5.query.sqlpp
new file mode 100644
index 0000000..f04a02c
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/external-library/big_object_pyudf/big_object_pyudf.5.query.sqlpp
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+* Description  : Create an external dataset that contains long comments fields, 10% of the records have a 32K size comments.
+                 This will trigger into the VSizeFrame path
+* Expected Res : Success
+* Date         : Jun 16 2015
+*/
+
+USE test;
+
+
+SELECT ROUND(AVG(`string-length`(roundtrip(c.c_comment))),3) AS len_c_comment, ROUND(AVG(`string-length`(roundtrip(o.o_comment))),3) AS len_o_comment
+FROM Customer AS c,
+      `Order` AS o
+WHERE c.c_custkey = o.o_custkey;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/external-library/big_object_pyudf/join.1.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/external-library/big_object_pyudf/join.1.adm
new file mode 100644
index 0000000..dfe2582
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/external-library/big_object_pyudf/join.1.adm
@@ -0,0 +1 @@
+{ "len_c_comment": 2972.995, "len_o_comment": 375.386 }
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_it_python.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_it_python.xml
index 35bec85..5fc7316 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_it_python.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_it_python.xml
@@ -57,7 +57,7 @@
     result[0].append(self.next_tuple(*arg, key=self.mid))
   File "entrypoint.py", line 99, in next_tuple
     return self.wrapped_fns[key](*args)
-  File "site-packages/roundtrip.py", line 29, in warning
+  File "site-packages/roundtrip.py", line 32, in warning
     raise ArithmeticError("oof")
 ArithmeticError: oof
  (in line 28, at column 1)</expected-warn>
@@ -80,5 +80,10 @@
         <expected-warn>ASX0201: External UDF returned exception. Returned exception was: java.io.IOException: Python process exited with code: 1 (in line 23, at column 1)</expected-warn>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="external-library">
+      <compilation-unit name="big_object_pyudf">
+        <output-dir compare="Text">big_object_pyudf</output-dir>
+      </compilation-unit>
+    </test-case>
   </test-group>
 </test-suite>