exp: implement internal queue.kill support(#7587)

fix: #7587
1. Add implement kill method for local queue class
2. Add a test to make sure the following job will be success after the
   original job was killed.
3. Some refactoring work on `exp remove`

dvc/repo/experiments/queue/base.py

@@ -170,6 +170,14 @@ def get_result(self, entry: QueueEntry) -> Optional[ExecutorResult]:
         This method blocks until the specified item has been collected.
         """
 
+    @abstractmethod
+    def kill(self, revs: str) -> None:
+        """Kill the specified running entries in the queue.
+
+        Arguments:
+            revs: Stash revs or running exp name to be killed.
+        """
+
     @abstractmethod
     def shutdown(self, kill: bool = False):
         """Shutdown the queue worker.
@@ -495,3 +503,28 @@ def on_diverged(ref: str, checkpoint: bool):
             executor.collect_cache(exp.repo, exec_result.ref_info)
 
         return results
+
+    def get_queue_entry_by_names(
+        self,
+        exp_names: Collection[str],
+    ) -> Dict[str, Optional[QueueEntry]]:
+        from scmrepo.exceptions import RevError as InternalRevError
+
+        exp_name_set = set(exp_names)
+        result: Dict[str, Optional[QueueEntry]] = {}
+        rev_entries = {}
+
+        for entry in self.iter_queued():
+            if entry.name in exp_name_set:
+                result[entry.name] = entry
+            else:
+                rev_entries[entry.stash_rev] = entry
+
+        for exp_name in exp_name_set.difference(result.keys()):
+            try:
+                rev = self.scm.resolve_rev(exp_name)
+                if rev in rev_entries:
+                    result[exp_name] = rev_entries[rev]
+            except InternalRevError:
+                result[exp_name] = None
+        return result

dvc/repo/experiments/queue/local.py

@@ -5,6 +5,7 @@
 from collections import defaultdict
 from typing import (
     TYPE_CHECKING,
+    Collection,
     Dict,
     Generator,
     List,
@@ -20,7 +21,7 @@
 from dvc.daemon import daemonize
 from dvc.exceptions import DvcException
 
-from ..exceptions import ExpQueueEmptyError
+from ..exceptions import ExpQueueEmptyError, UnresolvedExpNamesError
 from ..executor.base import (
     EXEC_PID_DIR,
     EXEC_TMP_DIR,
@@ -200,6 +201,29 @@ def get_result(self, entry: QueueEntry) -> Optional[ExecutorResult]:
                 pass
             time.sleep(1)
 
+    def kill(self, revs: Collection[str]) -> None:
+        to_kill: Set[QueueEntry] = set()
+        not_active: List[str] = []
+        name_dict: Dict[
+            str, Optional[QueueEntry]
+        ] = self.get_queue_entry_by_names(set(revs))
+
+        missing_rev: List[str] = []
+        active_queue_entry = set(self.iter_active())
+        for rev, queue_entry in name_dict.items():
+            if queue_entry is None:
+                missing_rev.append(rev)
+            elif queue_entry not in active_queue_entry:
+                not_active.append(rev)
+            else:
+                to_kill.add(queue_entry)
+
+        if missing_rev:
+            raise UnresolvedExpNamesError(missing_rev)
+
+        for queue_entry in to_kill:
+            self.proc.kill(queue_entry.name)
+
     def _shutdown_handler(self, task_id: str = None, **kwargs):
         if task_id in self._shutdown_task_ids:
             self._shutdown_task_ids.remove(task_id)
@@ -336,5 +360,8 @@ def collect_executor(  # pylint: disable=unused-argument
     def get_result(self, entry: QueueEntry) -> Optional[ExecutorResult]:
         raise NotImplementedError
 
+    def kill(self, revs: Collection[str]) -> None:
+        raise NotImplementedError
+
     def shutdown(self, kill: bool = False):
         raise NotImplementedError

dvc/repo/experiments/remove.py

@@ -1,5 +1,5 @@
 import logging
-from typing import TYPE_CHECKING, Dict, List, Mapping, Optional, Set, Union
+from typing import TYPE_CHECKING, Dict, List, Mapping, Optional, Union
 
 from dvc.repo import locked
 from dvc.repo.scm_context import scm_context
@@ -85,7 +85,9 @@ def _resolve_exp_by_name(
             commit_ref_dict[exp_ref] = exp_name
 
     if not git_remote:
-        _named_entries = _get_queue_entry_by_names(repo, remained)
+        _named_entries = (
+            repo.experiments.celery_queue.get_queue_entry_by_names(remained)
+        )
         for exp_name, entry in _named_entries.items():
             if entry is not None:
                 queue_entry_dict[exp_name] = entry
@@ -127,30 +129,6 @@ def _clear_all_commits(repo, git_remote) -> List:
     return _remove_commited_exps(repo.scm, ref_infos, git_remote)
 
 
-def _get_queue_entry_by_names(
-    repo: "Repo",
-    exp_name_set: Set[str],
-) -> Dict[str, Optional[QueueEntry]]:
-    from scmrepo.exceptions import RevError as InternalRevError
-
-    result = {}
-    rev_entries = {}
-    for entry in repo.experiments.celery_queue.iter_queued():
-        if entry.name in exp_name_set:
-            result[entry.name] = entry
-        else:
-            rev_entries[entry.stash_rev] = entry
-
-    for exp_name in exp_name_set.difference(result.keys()):
-        try:
-            rev = repo.scm.resolve_rev(exp_name)
-            if rev in rev_entries:
-                result[exp_name] = rev_entries[rev]
-        except InternalRevError:
-            result[exp_name] = None
-    return result
-
-
 def _remove_commited_exps(
     scm: "Git", exp_ref_dict: Mapping[ExpRefInfo, str], remote: Optional[str]
 ) -> List[str]:

tests/unit/repo/experiments/queue/test_local.py

@@ -8,8 +8,8 @@ def test_shutdown_no_tasks(test_queue, mocker):
 
 
 @shared_task
-def _foo():
-    return "foo"
+def _foo(arg="foo"):
+    return arg
 
 
 def test_shutdown_active_tasks(test_queue, mocker):
@@ -35,3 +35,35 @@ def test_shutdown_active_tasks(test_queue, mocker):
     assert "foo" == result.get()
     assert result.id not in test_queue._shutdown_task_ids
     shutdown_spy.assert_called_once()
+
+
+def test_post_run_after_kill(test_queue, mocker):
+    import time
+
+    from celery import chain
+
+    sig_bar = test_queue.proc.run(
+        ["python3", "-c", "import time; time.sleep(5)"], name="bar"
+    )
+    result_bar = sig_bar.freeze()
+    sig_foo = _foo.s()
+    result_foo = sig_foo.freeze()
+    run_chain = chain(sig_bar, sig_foo)
+
+    run_chain.delay()
+    timeout = time.time() + 10
+
+    while True:
+        if result_bar.status == "RUNNING":
+            break
+        if time.time() > timeout:
+            raise AssertionError()
+
+    assert result_foo.status == "PENDING"
+    test_queue.proc.kill("bar")
+
+    while True:
+        if result_foo.status == "SUCCESS":
+            break
+        if time.time() > timeout:
+            raise AssertionError()