[BUGFIX] Resolve boto3 client threading issue (#66)

* Added thread locks and updated pytest adapter version

* Placing impl.py in the correct location

Author: DVerzal

Diff for: dbt/adapters/athena/impl.py

@@ -4,6 +4,7 @@
 import boto3
 from botocore.exceptions import ClientError
 from typing import Optional
+from threading import Lock
 
 from dbt.adapters.base import available
 from dbt.adapters.sql import SQLAdapter
@@ -12,6 +13,8 @@
 from dbt.events import AdapterLogger
 logger = AdapterLogger("Athena")
 
+boto3_client_lock = Lock()
+
 class AthenaAdapter(SQLAdapter):
     ConnectionManager = AthenaConnectionManager
     Relation = AthenaRelation
@@ -52,7 +55,8 @@ def clean_up_partitions(
         conn = self.connections.get_thread_connection()
         client = conn.handle
 
-        glue_client = boto3.client('glue', region_name=client.region_name)
+        with boto3_client_lock:
+            glue_client = boto3.client('glue', region_name=client.region_name)
         s3_resource = boto3.resource('s3', region_name=client.region_name)
         partitions = glue_client.get_partitions(
             # CatalogId='123456789012', # Need to make this configurable if it is different from default AWS Account ID
@@ -77,7 +81,8 @@ def clean_up_table(
         # Look up Glue partitions & clean up
         conn = self.connections.get_thread_connection()
         client = conn.handle
-        glue_client = boto3.client('glue', region_name=client.region_name)
+        with boto3_client_lock:
+            glue_client = boto3.client('glue', region_name=client.region_name)
         try:
             table = glue_client.get_table(
                 DatabaseName=database_name,

Diff for: dev_requirements.txt

@@ -1,4 +1,4 @@
 flake8==3.8.4
 
 # Test requirements
-pytest-dbt-adapter==0.5.1
+pytest-dbt-adapter==0.6.0