diff --git a/etc/rally.bash_completion b/etc/rally.bash_completion
index 8656a752..4c129449 100644
--- a/etc/rally.bash_completion
+++ b/etc/rally.bash_completion
@@ -37,7 +37,7 @@ _rally()
     OPTS["show_keypairs"]="--deployment"
     OPTS["show_networks"]="--deployment"
     OPTS["show_secgroups"]="--deployment"
-    OPTS["task_abort"]="--uuid"
+    OPTS["task_abort"]="--uuid --soft"
     OPTS["task_delete"]="--force --uuid"
     OPTS["task_detailed"]="--uuid --iterations-data"
     OPTS["task_list"]="--deployment --all-deployments --status --uuids-only"
@@ -83,4 +83,4 @@ _rally()
     return 0
 }
 
-complete -o filenames -F _rally rally
\ No newline at end of file
+complete -o filenames -F _rally rally
diff --git a/rally/consts.py b/rally/consts.py
index 94c2f616..df2356b2 100644
--- a/rally/consts.py
+++ b/rally/consts.py
@@ -55,6 +55,10 @@ class _TaskStatus(utils.ImmutableMixin, utils.EnumMixin):
     CLEANING_UP = "cleaning up"
     FINISHED = "finished"
     FAILED = "failed"
+    ABORTING = "aborting"
+    SOFT_ABORTING = "soft_aborting"
+    ABORTED = "aborted"
+    PAUSED = "paused"
 
 
 class _DeployStatus(utils.ImmutableMixin, utils.EnumMixin):
diff --git a/tests/functional/test_cli_task.py b/tests/functional/test_cli_task.py
index 41bdf321..f46827fc 100644
--- a/tests/functional/test_cli_task.py
+++ b/tests/functional/test_cli_task.py
@@ -16,6 +16,8 @@
 import json
 import os
 import re
+import threading
+import time
 import unittest
 
 import mock
@@ -543,9 +545,88 @@ class TaskTestCase(unittest.TestCase):
         }
         self._test_start_abort_on_sla_failure(cfg, times)
 
-    # NOTE(oanufriev): Not implemented
+    def _start_task_in_new_thread(self, rally, cfg, report_file):
+        deployment_id = utils.get_global("RALLY_DEPLOYMENT", rally.env)
+        config = utils.TaskConfig(cfg)
+        cmd = (("task start --task %(task_file)s "
+                "--deployment %(deployment_id)s") %
+               {"task_file": config.filename,
+                "deployment_id": deployment_id})
+        report_path = os.path.join(
+            os.environ.get("REPORTS_ROOT", "rally-cli-output-files"),
+            "TaskTestCase", report_file)
+        task = threading.Thread(target=rally, args=(cmd, ),
+                                kwargs={"report_path": report_path})
+        task.start()
+        uuid = None
+        while not uuid:
+            if not uuid:
+                uuid = utils.get_global("RALLY_TASK", rally.env)
+                time.sleep(0.5)
+        return task, uuid
+
     def test_abort(self):
-        pass
+        RUNNER_TIMES = 10
+        cfg = {
+            "Dummy.dummy": [
+                {
+                    "args": {
+                        "sleep": 5
+                    },
+                    "runner": {
+                        "type": "serial",
+                        "times": RUNNER_TIMES
+                    }
+                }
+            ]
+        }
+        rally = utils.Rally()
+        task, uuid = self._start_task_in_new_thread(
+            rally, cfg, "test_abort-thread_with_abort.txt")
+        rally("task abort %s" % uuid)
+        task.join()
+        results = json.loads(rally("task results"))
+        iterations_completed = len(results[0]["result"])
+        # NOTE(msdubov): check that the task is really stopped before
+        #                the specified number of iterations
+        self.assertTrue(iterations_completed < RUNNER_TIMES)
+        self.assertIn("aborted", rally("task status"))
+        report = rally.gen_report_path(extension="html")
+        rally("task report --out %s" % report)
+
+    def test_abort_soft(self):
+        cfg = {
+            "Dummy.dummy": [
+                {
+                    "args": {
+                        "sleep": 2
+                    },
+                    "runner": {
+                        "type": "serial",
+                        "times": 3,
+                    }
+                },
+                {
+                    "runner": {
+                        "type": "serial",
+                        "times": 10,
+                    }
+                }
+            ]
+        }
+        rally = utils.Rally()
+        task, uuid = self._start_task_in_new_thread(
+            rally, cfg, "test_abort_soft-thread_with_soft_abort.txt")
+        rally("task abort --soft")
+        task.join()
+        results = json.loads(rally("task results"))
+        iterations_completed = len(results[0]["result"])
+        # NOTE(msdubov): check that the task is stopped after first runner
+        #                benchmark finished all its iterations
+        self.assertEqual(3, iterations_completed)
+        # NOTE(msdubov): check that the next benchmark scenario is not started
+        self.assertEqual(1, len(results))
+        self.assertIn("aborted", rally("task status"))
 
     def test_use(self):
         rally = utils.Rally()