diff --git a/ydb/apps/dstool/lib/common.py b/ydb/apps/dstool/lib/common.py
index 51811838522e..b61d9a4e5064 100644
--- a/ydb/apps/dstool/lib/common.py
+++ b/ydb/apps/dstool/lib/common.py
@@ -111,6 +111,7 @@ def apply_args(self, args, with_localhost=True):
 
         if args.token_file:
             self.token = args.token_file.readline().rstrip('\r\n')
+            args.token_file.close()
         if self.token is None:
             self.token = os.getenv('YDB_TOKEN')
             if self.token is not None:
diff --git a/ydb/apps/dstool/lib/dstool_cmd_cluster_workload_run.py b/ydb/apps/dstool/lib/dstool_cmd_cluster_workload_run.py
index 0a7a6810d00c..1455664c690a 100644
--- a/ydb/apps/dstool/lib/dstool_cmd_cluster_workload_run.py
+++ b/ydb/apps/dstool/lib/dstool_cmd_cluster_workload_run.py
@@ -16,6 +16,9 @@ def add_options(p):
     p.add_argument('--disable-evicts', action='store_true', help='Disable VDisk evicts')
     p.add_argument('--disable-restarts', action='store_true', help='Disable node restarts')
     p.add_argument('--enable-pdisk-encryption-keys-changes', action='store_true', help='Enable changes of PDisk encryption keys')
+    p.add_argument('--enable-kill-tablets', action='store_true', help='Enable tablet killer')
+    p.add_argument('--enable-kill-blob-depot', action='store_true', help='Enable BlobDepot killer')
+    p.add_argument('--kill-signal', type=str, default='KILL', help='Kill signal to send to restart node')
 
 
 def fetch_start_time_map(base_config):
@@ -84,6 +87,8 @@ def do(args):
                 config_retries -= 1
             continue
 
+        tablets = common.fetch_json_info('tabletinfo') if args.enable_kill_tablets or args.enable_kill_blob_depot else {}
+
         config_retries = None
 
         for vslot in base_config.VSlot:
@@ -135,7 +140,7 @@ def do_restart(node_id):
             host = node_fqdn_map[node_id]
             if args.enable_pdisk_encryption_keys_changes:
                 update_pdisk_key_config(node_fqdn_map, pdisk_keys, node_id)
-            subprocess.call(['ssh', host, 'sudo', 'killall', '-9', 'kikimr'])
+            subprocess.call(['ssh', host, 'sudo', 'killall', '-%s' % args.kill_signal, 'kikimr'])
             if args.enable_pdisk_encryption_keys_changes:
                 remove_old_pdisk_keys(pdisk_keys, pdisk_key_versions, node_id)
 
@@ -185,6 +190,29 @@ def do_add_pdisk_key(node_id):
                                         "version" : v,
                                         "file" : "keynumber" + str(v)})
 
+        def do_kill_tablet():
+            tablet_list = [
+                value
+                for key, value in tablets.items()
+                if value['State'] == 'Active' and value['Leader']
+            ]
+            item = random.choice(tablet_list)
+            tablet_id = int(item['TabletId'])
+            print('Killing tablet %d of type %s' % (tablet_id, item['Type']))
+            common.fetch('tablets', dict(RestartTabletID=tablet_id), fmt='raw', cache=False)
+
+        def do_kill_blob_depot():
+            tablet_list = [
+                value
+                for key, value in tablets.items()
+                if value['State'] == 'Active' and value['Leader'] and value['Type'] == 'BlobDepot'
+            ]
+            if tablet_list:
+                item = random.choice(tablet_list)
+                tablet_id = int(item['TabletId'])
+                print('Killing tablet %d of type %s' % (tablet_id, item['Type']))
+                common.fetch('tablets', dict(RestartTabletID=tablet_id), fmt='raw', cache=False)
+
         ################################################################################################################
 
         now = datetime.utcnow()
@@ -193,19 +221,45 @@ def do_add_pdisk_key(node_id):
 
         possible_actions = []
 
+        if args.enable_kill_tablets:
+            possible_actions.append(('kill tablet', (do_kill_tablet,)))
+        if args.enable_kill_blob_depot:
+            possible_actions.append(('kill blob depot', (do_kill_blob_depot,)))
+
+        evicts = []
+        wipes = []
+        readonlies = []
+        unreadonlies = []
+
         for vslot in base_config.VSlot:
             if common.is_dynamic_group(vslot.GroupId):
                 vslot_id = common.get_vslot_id(vslot.VSlotId)
                 vdisk_id = '[%08x:%d:%d:%d]' % (vslot.GroupId, vslot.FailRealmIdx, vslot.FailDomainIdx, vslot.VDiskIdx)
                 if vslot_id in vslot_readonly and not args.disable_readonly:
-                    possible_actions.append(('un-readonly vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_readonly, vslot, False)))
+                    unreadonlies.append(('un-readonly vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_readonly, vslot, False)))
                 if can_act_on_vslot(*vslot_id) and (recent_restarts or args.disable_restarts):
                     if not args.disable_evicts:
-                        possible_actions.append(('evict vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_evict, vslot_id)))
+                        evicts.append(('evict vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_evict, vslot_id)))
                     if not args.disable_wipes:
-                        possible_actions.append(('wipe vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_wipe, vslot)))
+                        wipes.append(('wipe vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_wipe, vslot)))
                     if not args.disable_readonly:
-                        possible_actions.append(('readonly vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_readonly, vslot, True)))
+                        readolies.append(('readonly vslot id: %s, vdisk id: %s' % (vslot_id, vdisk_id), (do_readonly, vslot, True)))
+
+        def pick(v):
+            action_name, action = random.choice(v)
+            print(action_name)
+            action[0](*action[1:])
+
+        if evicts:
+            possible_actions.append(('evict', (pick, evicts)))
+        if wipes:
+            possible_actions.append(('wipe', (pick, wipes)))
+        if readonlies:
+            possible_actions.append(('readonly', (pick, readonlies)))
+        if unreadonlies:
+            possible_actions.append(('un-readonly', (pick, unreadonlies)))
+
+        restarts = []
 
         if start_time_map and len(recent_restarts) < 3:
             # sort so that the latest restarts come first
@@ -216,7 +270,10 @@ def do_add_pdisk_key(node_id):
                 if args.enable_pdisk_encryption_keys_changes:
                     possible_actions.append(('add new pdisk key to node with id: %d' % node_id, (do_add_pdisk_key, node_id)))
                 if not args.disable_restarts:
-                    possible_actions.append(('restart node with id: %d' % node_id, (do_restart, node_id)))
+                    restarts.append(('restart node with id: %d' % node_id, (do_restart, node_id)))
+
+        if restarts:
+            possible_actions.append(('restart', (pick, restarts)))
 
         if not possible_actions:
             common.print_if_not_quiet(args, 'Waiting for the next round...', file=sys.stdout)
@@ -226,7 +283,7 @@ def do_add_pdisk_key(node_id):
         ################################################################################################################
 
         action_name, action = random.choice(possible_actions)
-        common.print_if_not_quiet(args, '%s' % action_name, file=sys.stdout)
+        print('%s %s' % (action_name, datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S')))
 
         try:
             action[0](*action[1:])
diff --git a/ydb/apps/dstool/lib/dstool_cmd_group_take_snapshot.py b/ydb/apps/dstool/lib/dstool_cmd_group_take_snapshot.py
index 5247f4d8ef7a..852dfb4f5454 100644
--- a/ydb/apps/dstool/lib/dstool_cmd_group_take_snapshot.py
+++ b/ydb/apps/dstool/lib/dstool_cmd_group_take_snapshot.py
@@ -42,10 +42,11 @@ def get_endpoints():
     global output_file
     output_file = args.output
 
-    threads = []
-    for p in get_endpoints():
-        thread = Thread(target=fetch_blobs_from_vdisk, args=p, daemon=True)
-        threads.append(thread)
-        thread.start()
-    for thread in threads:
-        thread.join()
+    with output_file:
+        threads = []
+        for p in get_endpoints():
+            thread = Thread(target=fetch_blobs_from_vdisk, args=p, daemon=True)
+            threads.append(thread)
+            thread.start()
+        for thread in threads:
+            thread.join()
diff --git a/ydb/core/keyvalue/channel_balancer.h b/ydb/core/keyvalue/channel_balancer.h
index ca013400f9c3..378c22434d52 100644
--- a/ydb/core/keyvalue/channel_balancer.h
+++ b/ydb/core/keyvalue/channel_balancer.h
@@ -114,7 +114,7 @@ namespace NKikimr::NKeyValue {
                     const size_t index = (LatencyQueue.size() - 1) * 99 / 100;
                     const TDuration perc = latencies[index];
                     weight = MeanExpectedLatency.GetValue() * weight / Max(perc, TDuration::MilliSeconds(1)).GetValue();
-                    Y_DEBUG_ABORT_UNLESS(weight);
+                    //Y_DEBUG_ABORT_UNLESS(weight);
                     if (!weight) {
                         weight = 1;
                     }
diff --git a/ydb/core/keyvalue/keyvalue_state.cpp b/ydb/core/keyvalue/keyvalue_state.cpp
index 140146b04b05..8135c86c2a2b 100644
--- a/ydb/core/keyvalue/keyvalue_state.cpp
+++ b/ydb/core/keyvalue/keyvalue_state.cpp
@@ -634,6 +634,9 @@ void TKeyValueState::InitExecute(ui64 tabletId, TActorId keyValueActorId, ui32 e
     }
 
     THelpers::DbEraseCollect(db, ctx);
+    if (IsEmptyDbStart) {
+        THelpers::DbUpdateState(StoredState, db, ctx);
+    }
 
     // corner case, if no CollectGarbage events were sent
     if (InitialCollectsSent == 0) {
diff --git a/ydb/core/keyvalue/keyvalue_storage_request.cpp b/ydb/core/keyvalue/keyvalue_storage_request.cpp
index 3029aff65985..f725b9f459b0 100644
--- a/ydb/core/keyvalue/keyvalue_storage_request.cpp
+++ b/ydb/core/keyvalue/keyvalue_storage_request.cpp
@@ -341,6 +341,11 @@ class TKeyValueStorageRequest : public TActorBootstrapped<TKeyValueStorageReques
                 IntermediateResults->Stat.GroupReadIops[std::make_pair(response.Id.Channel(), groupId)] += 1; // FIXME: count distinct blobs?
                 read.Value.Write(readItem.ValueOffset, std::move(response.Buffer));
             } else {
+                Y_VERIFY_DEBUG_S(response.Status != NKikimrProto::NODATA, "NODATA received for TEvGet"
+                    << " TabletId# " << TabletInfo->TabletID
+                    << " Id# " << response.Id
+                    << " Key# " << read.Key);
+
                 TStringStream err;
                 if (read.Message.size()) {
                     err << read.Message << Endl;