From 98ccd4c38259ef81ef4c5eeacc22bba0c4d761f4 Mon Sep 17 00:00:00 2001
From: Andrey Berezin <a.berezin@yadro.com>
Date: Tue, 3 Oct 2023 15:18:29 +0300
Subject: [PATCH] [#91] Failover enhancements

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>
---
 pyproject.toml                                |  3 +
 src/frostfs_testlib/cli/frostfs_cli/cli.py    |  2 +
 src/frostfs_testlib/cli/frostfs_cli/tree.py   | 29 +++++++++
 .../healthcheck/basic_healthcheck.py          | 14 ++++
 src/frostfs_testlib/healthcheck/interfaces.py |  9 +++
 src/frostfs_testlib/hosting/config.py         |  2 +
 src/frostfs_testlib/load/interfaces.py        |  2 +-
 src/frostfs_testlib/load/k6.py                | 39 +++++++++--
 src/frostfs_testlib/load/load_config.py       | 23 +++++++
 src/frostfs_testlib/load/load_metrics.py      | 16 +++--
 src/frostfs_testlib/load/load_report.py       | 21 +++---
 src/frostfs_testlib/load/load_verifiers.py    | 64 ++++++++++++-------
 src/frostfs_testlib/load/runners.py           |  4 +-
 src/frostfs_testlib/resources/load_params.py  |  3 +-
 .../controllers/background_load_controller.py | 23 ++++---
 src/frostfs_testlib/testing/parallel.py       |  2 +-
 16 files changed, 200 insertions(+), 56 deletions(-)
 create mode 100644 src/frostfs_testlib/cli/frostfs_cli/tree.py
 create mode 100644 src/frostfs_testlib/healthcheck/basic_healthcheck.py
 create mode 100644 src/frostfs_testlib/healthcheck/interfaces.py

diff --git a/pyproject.toml b/pyproject.toml
index f85b883..778e2fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,6 +44,9 @@ allure = "frostfs_testlib.reporter.allure_handler:AllureHandler"
 [project.entry-points."frostfs.testlib.hosting"]
 docker = "frostfs_testlib.hosting.docker_host:DockerHost"
 
+[project.entry-points."frostfs.testlib.healthcheck"]
+basic = "frostfs_testlib.healthcheck.basic_healthcheck:BasicHealthcheck"
+
 [tool.isort]
 profile = "black"
 src_paths = ["src", "tests"]
diff --git a/src/frostfs_testlib/cli/frostfs_cli/cli.py b/src/frostfs_testlib/cli/frostfs_cli/cli.py
index 5d55f55..a78da8b 100644
--- a/src/frostfs_testlib/cli/frostfs_cli/cli.py
+++ b/src/frostfs_testlib/cli/frostfs_cli/cli.py
@@ -8,6 +8,7 @@ from frostfs_testlib.cli.frostfs_cli.object import FrostfsCliObject
 from frostfs_testlib.cli.frostfs_cli.session import FrostfsCliSession
 from frostfs_testlib.cli.frostfs_cli.shards import FrostfsCliShards
 from frostfs_testlib.cli.frostfs_cli.storagegroup import FrostfsCliStorageGroup
+from frostfs_testlib.cli.frostfs_cli.tree import FrostfsCliTree
 from frostfs_testlib.cli.frostfs_cli.util import FrostfsCliUtil
 from frostfs_testlib.cli.frostfs_cli.version import FrostfsCliVersion
 from frostfs_testlib.shell import Shell
@@ -36,3 +37,4 @@ class FrostfsCli:
         self.storagegroup = FrostfsCliStorageGroup(shell, frostfs_cli_exec_path, config=config_file)
         self.util = FrostfsCliUtil(shell, frostfs_cli_exec_path, config=config_file)
         self.version = FrostfsCliVersion(shell, frostfs_cli_exec_path, config=config_file)
+        self.tree = FrostfsCliTree(shell, frostfs_cli_exec_path, config=config_file)
diff --git a/src/frostfs_testlib/cli/frostfs_cli/tree.py b/src/frostfs_testlib/cli/frostfs_cli/tree.py
new file mode 100644
index 0000000..af330fe
--- /dev/null
+++ b/src/frostfs_testlib/cli/frostfs_cli/tree.py
@@ -0,0 +1,29 @@
+from typing import Optional
+
+from frostfs_testlib.cli.cli_command import CliCommand
+from frostfs_testlib.shell import CommandResult
+
+
+class FrostfsCliTree(CliCommand):
+    def healthcheck(
+        self,
+        wallet: Optional[str] = None,
+        rpc_endpoint: Optional[str] = None,
+        timeout: Optional[str] = None,
+    ) -> CommandResult:
+        """Get internal balance of FrostFS account
+
+        Args:
+            address: Address of wallet account.
+            owner: Owner of balance account (omit to use owner from private key).
+            rpc_endpoint: Remote node address (as 'multiaddr' or '<host>:<port>').
+            wallet: WIF (NEP-2) string or path to the wallet or binary key.
+
+        Returns:
+            Command's result.
+
+        """
+        return self._execute(
+            "tree healthcheck",
+            **{param: value for param, value in locals().items() if param not in ["self"]},
+        )
diff --git a/src/frostfs_testlib/healthcheck/basic_healthcheck.py b/src/frostfs_testlib/healthcheck/basic_healthcheck.py
new file mode 100644
index 0000000..9ec8694
--- /dev/null
+++ b/src/frostfs_testlib/healthcheck/basic_healthcheck.py
@@ -0,0 +1,14 @@
+from frostfs_testlib.healthcheck.interfaces import Healthcheck
+from frostfs_testlib.reporter import get_reporter
+from frostfs_testlib.steps.node_management import storage_node_healthcheck
+from frostfs_testlib.storage.cluster import ClusterNode
+
+reporter = get_reporter()
+
+
+class BasicHealthcheck(Healthcheck):
+    @reporter.step_deco("Perform healthcheck for {cluster_node}")
+    def perform_healthcheck(self, cluster_node: ClusterNode):
+        health_check = storage_node_healthcheck(cluster_node.storage_node)
+        if health_check.health_status != "READY" or health_check.network_status != "ONLINE":
+            raise AssertionError("Node {cluster_node} is not healthy")
diff --git a/src/frostfs_testlib/healthcheck/interfaces.py b/src/frostfs_testlib/healthcheck/interfaces.py
new file mode 100644
index 0000000..0c77957
--- /dev/null
+++ b/src/frostfs_testlib/healthcheck/interfaces.py
@@ -0,0 +1,9 @@
+from abc import ABC, abstractmethod
+
+from frostfs_testlib.storage.cluster import ClusterNode
+
+
+class Healthcheck(ABC):
+    @abstractmethod
+    def perform(self, cluster_node: ClusterNode):
+        """Perform healthcheck on the target cluster node"""
diff --git a/src/frostfs_testlib/hosting/config.py b/src/frostfs_testlib/hosting/config.py
index 6679470..88fe3e7 100644
--- a/src/frostfs_testlib/hosting/config.py
+++ b/src/frostfs_testlib/hosting/config.py
@@ -52,6 +52,7 @@ class HostConfig:
 
     Attributes:
         plugin_name: Name of plugin that should be used to manage the host.
+        healthcheck_plugin_name: Name of the plugin for healthcheck operations.
         address: Address of the machine (IP or DNS name).
         services: List of services hosted on the machine.
         clis: List of CLI tools available on the machine.
@@ -60,6 +61,7 @@ class HostConfig:
     """
 
     plugin_name: str
+    healthcheck_plugin_name: str
     address: str
     services: list[ServiceConfig] = field(default_factory=list)
     clis: list[CLIConfig] = field(default_factory=list)
diff --git a/src/frostfs_testlib/load/interfaces.py b/src/frostfs_testlib/load/interfaces.py
index 98c9d62..394fff7 100644
--- a/src/frostfs_testlib/load/interfaces.py
+++ b/src/frostfs_testlib/load/interfaces.py
@@ -50,7 +50,7 @@ class ScenarioRunner(ABC):
         """Returns True if load is running at the moment"""
 
     @abstractmethod
-    def wait_until_finish(self):
+    def wait_until_finish(self, soft_timeout: int = 0):
         """Wait until load is finished"""
 
     @abstractmethod
diff --git a/src/frostfs_testlib/load/k6.py b/src/frostfs_testlib/load/k6.py
index cb3576e..e7a2b39 100644
--- a/src/frostfs_testlib/load/k6.py
+++ b/src/frostfs_testlib/load/k6.py
@@ -3,6 +3,7 @@ import logging
 import math
 import os
 from dataclasses import dataclass
+from datetime import datetime
 from time import sleep
 from typing import Any
 from urllib.parse import urlparse
@@ -39,6 +40,7 @@ class LoadResults:
 
 class K6:
     _k6_process: RemoteProcess
+    _start_time: datetime
 
     def __init__(
         self,
@@ -122,6 +124,7 @@ class K6:
         with reporter.step(
             f"Start load from loader {self.loader.ip} on endpoints {self.endpoints}"
         ):
+            self._start_time = int(datetime.utcnow().timestamp())
             command = (
                 f"{self._k6_dir}/k6 run {self._generate_env_variables()} "
                 f"{self._k6_dir}/scenarios/{self.load_params.scenario.value}.js"
@@ -131,7 +134,7 @@ class K6:
                 command, self.shell, self.load_params.working_dir, user
             )
 
-    def wait_until_finished(self) -> None:
+    def wait_until_finished(self, soft_timeout: int = 0) -> None:
         with reporter.step(
             f"Wait until load is finished from loader {self.loader.ip} on endpoints {self.endpoints}"
         ):
@@ -140,9 +143,36 @@ class K6:
             else:
                 timeout = self.load_params.load_time or 0
 
-            timeout += int(K6_TEARDOWN_PERIOD)
+            current_time = int(datetime.utcnow().timestamp())
+            working_time = current_time - self._start_time
+            remaining_time = timeout - working_time
+
+            setup_teardown_time = (
+                int(K6_TEARDOWN_PERIOD)
+                + self.load_params.get_init_time()
+                + int(self.load_params.setup_timeout.replace("s", "").strip())
+            )
+            remaining_time_including_setup_and_teardown = remaining_time + setup_teardown_time
+            timeout = remaining_time_including_setup_and_teardown
+
+            if soft_timeout:
+                timeout = min(timeout, soft_timeout)
+
             original_timeout = timeout
 
+            timeouts = {
+                "K6 start time": self._start_time,
+                "Current time": current_time,
+                "K6 working time": working_time,
+                "Remaining time for load": remaining_time,
+                "Setup and teardown": setup_teardown_time,
+                "Remaining time including setup/teardown": remaining_time_including_setup_and_teardown,
+                "Soft timeout": soft_timeout,
+                "Selected timeout": original_timeout,
+            }
+
+            reporter.attach("\n".join([f"{k}: {v}" for k, v in timeouts.items()]), "timeouts.txt")
+
             min_wait_interval = 10
             wait_interval = min_wait_interval
             if self._k6_process is None:
@@ -162,7 +192,8 @@ class K6:
                 return
 
             self.stop()
-            raise TimeoutError(f"Expected K6 to finish after {original_timeout} sec.")
+            if not soft_timeout:
+                raise TimeoutError(f"Expected K6 to finish after {original_timeout} sec.")
 
     def get_results(self) -> Any:
         with reporter.step(
@@ -187,7 +218,7 @@ class K6:
 
     def stop(self) -> None:
         with reporter.step(f"Stop load from loader {self.loader.ip} on endpoints {self.endpoints}"):
-            if self.is_running:
+            if self.is_running():
                 self._k6_process.stop()
 
             self._wait_until_process_end()
diff --git a/src/frostfs_testlib/load/load_config.py b/src/frostfs_testlib/load/load_config.py
index 97f5dd6..678fc38 100644
--- a/src/frostfs_testlib/load/load_config.py
+++ b/src/frostfs_testlib/load/load_config.py
@@ -1,3 +1,4 @@
+import math
 import os
 from dataclasses import dataclass, field, fields, is_dataclass
 from enum import Enum
@@ -133,6 +134,12 @@ class Preset:
     # S3 region (AKA placement policy for S3 buckets)
     s3_location: Optional[str] = metadata_field(s3_preset_scenarios, "location", None, False)
 
+    # Delay between containers creation and object upload for preset
+    object_upload_delay: Optional[int] = metadata_field(all_load_scenarios, "sleep", None, False)
+
+    # Flag to control preset erorrs
+    ignore_errors: Optional[bool] = metadata_field(all_load_scenarios, "ignore-errors", None, False)
+
 
 @dataclass
 class LoadParams:
@@ -194,6 +201,12 @@ class LoadParams:
     # https://k6.io/docs/using-k6/k6-options/reference/#setup-timeout
     setup_timeout: Optional[str] = metadata_field(all_scenarios, None, "K6_SETUP_TIMEOUT", False)
 
+    # Delay for read operations in case if we read from registry
+    read_age: Optional[int] = metadata_field(all_load_scenarios, None, "READ_AGE", None, False)
+
+    # Initialization time for each VU for k6 load
+    vu_init_time: Optional[float] = None
+
     # ------- CONSTANT VUS SCENARIO PARAMS -------
     # Amount of Writers VU.
     writers: Optional[int] = metadata_field(constant_vus_scenarios, None, "WRITERS", True, True)
@@ -306,6 +319,16 @@ class LoadParams:
 
         return command_args
 
+    def get_init_time(self) -> int:
+        return math.ceil(self._get_total_vus() * self.vu_init_time)
+
+    def _get_total_vus(self) -> int:
+        vu_fields = ["writers", "preallocated_writers"]
+        data_fields = [
+            getattr(self, field.name) or 0 for field in fields(self) if field.name in vu_fields
+        ]
+        return sum(data_fields)
+
     def _get_applicable_fields(self):
         applicable_fields = [
             meta_field
diff --git a/src/frostfs_testlib/load/load_metrics.py b/src/frostfs_testlib/load/load_metrics.py
index 5cec8ea..6c201ec 100644
--- a/src/frostfs_testlib/load/load_metrics.py
+++ b/src/frostfs_testlib/load/load_metrics.py
@@ -30,7 +30,7 @@ class MetricsBase(ABC):
     @property
     def write_success_iterations(self) -> int:
         return self._get_metric(self._WRITE_SUCCESS)
-    
+
     @property
     def write_latency(self) -> dict:
         return self._get_metric(self._WRITE_LATENCY)
@@ -54,7 +54,7 @@ class MetricsBase(ABC):
     @property
     def read_success_iterations(self) -> int:
         return self._get_metric(self._READ_SUCCESS)
-    
+
     @property
     def read_latency(self) -> dict:
         return self._get_metric(self._READ_LATENCY)
@@ -78,7 +78,7 @@ class MetricsBase(ABC):
     @property
     def delete_success_iterations(self) -> int:
         return self._get_metric(self._DELETE_SUCCESS)
-    
+
     @property
     def delete_latency(self) -> dict:
         return self._get_metric(self._DELETE_LATENCY)
@@ -92,7 +92,11 @@ class MetricsBase(ABC):
         return self._get_metric_rate(self._DELETE_SUCCESS)
 
     def _get_metric(self, metric: str) -> int:
-        metrics_method_map = {"counter": self._get_counter_metric, "gauge": self._get_gauge_metric, "trend" : self._get_trend_metrics}
+        metrics_method_map = {
+            "counter": self._get_counter_metric,
+            "gauge": self._get_gauge_metric,
+            "trend": self._get_trend_metrics,
+        }
 
         if metric not in self.metrics:
             return 0
@@ -129,8 +133,8 @@ class MetricsBase(ABC):
 
     def _get_gauge_metric(self, metric: str) -> int:
         return metric["values"]["value"]
-    
-    def  _get_trend_metrics(self, metric: str) -> int:
+
+    def _get_trend_metrics(self, metric: str) -> int:
         return metric["values"]
 
 
diff --git a/src/frostfs_testlib/load/load_report.py b/src/frostfs_testlib/load/load_report.py
index 26ab542..ec6d539 100644
--- a/src/frostfs_testlib/load/load_report.py
+++ b/src/frostfs_testlib/load/load_report.py
@@ -2,7 +2,6 @@ from datetime import datetime
 from typing import Optional
 
 import yaml
-import os
 
 from frostfs_testlib.load.load_config import K6ProcessAllocationStrategy, LoadParams, LoadScenario
 from frostfs_testlib.load.load_metrics import get_metrics_object
@@ -110,7 +109,7 @@ class LoadReport:
         total_rate: float,
         throughput: float,
         errors: dict[str, int],
-        latency: dict[str, dict], 
+        latency: dict[str, dict],
     ):
         throughput_html = ""
         if throughput > 0:
@@ -131,12 +130,16 @@ class LoadReport:
 
         latency_html = ""
         if latency:
-            for node_key, param_dict in latency.items():
-                latency_values = ""
-                for param_name, param_val in param_dict.items():
-                    latency_values += f"{param_name}={param_val:.2f}ms "
+            for node_key, latency_dict in latency.items():
+                latency_values = "N/A"
+                if latency_dict:
+                    latency_values = ""
+                    for param_name, param_val in latency_dict.items():
+                        latency_values += f"{param_name}={param_val:.2f}ms "
 
-                latency_html +=  self._row(f"Put latency {node_key.split(':')[0]}", latency_values)
+                latency_html += self._row(
+                    f"{operation_type} latency {node_key.split(':')[0]}", latency_values
+                )
 
         object_size, object_size_unit = calc_unit(self.load_params.object_size, 1)
         duration = self._seconds_to_formatted_duration(self.load_params.load_time)
@@ -145,8 +148,8 @@ class LoadReport:
         short_summary = f"{operation_type} {object_size}{object_size_unit} {duration} {requested_rate_str} {vus_str} {model} - {throughput:.2f}{unit}/s {total_rate:.2f}/s"
         errors_percent = 0
         if total_operations:
-            errors_percent = total_errors/total_operations*100.0
-        
+            errors_percent = total_errors / total_operations * 100.0
+
         html = f"""
         <table border="1" cellpadding="5px"><tbody>
         <tr><th colspan="2" bgcolor="gainsboro">{short_summary}</th></tr>
diff --git a/src/frostfs_testlib/load/load_verifiers.py b/src/frostfs_testlib/load/load_verifiers.py
index 80c3962..b691b02 100644
--- a/src/frostfs_testlib/load/load_verifiers.py
+++ b/src/frostfs_testlib/load/load_verifiers.py
@@ -12,7 +12,7 @@ class LoadVerifier:
     def __init__(self, load_params: LoadParams) -> None:
         self.load_params = load_params
 
-    def verify_load_results(self, load_summaries: dict[str, dict]):
+    def collect_load_issues(self, load_summaries: dict[str, dict]) -> list[str]:
         write_operations = 0
         write_errors = 0
 
@@ -41,38 +41,58 @@ class LoadVerifier:
                 delete_operations += metrics.delete_total_iterations
                 delete_errors += metrics.delete_failed_iterations
 
-        exceptions = []
+        issues = []
         if writers and not write_operations:
-            exceptions.append(f"No any write operation was performed")
+            issues.append(f"No any write operation was performed")
         if readers and not read_operations:
-            exceptions.append(f"No any read operation was performed")
+            issues.append(f"No any read operation was performed")
         if deleters and not delete_operations:
-            exceptions.append(f"No any delete operation was performed")
+            issues.append(f"No any delete operation was performed")
 
-        if write_operations and writers and write_errors / write_operations * 100 > self.load_params.error_threshold:
-            exceptions.append(
+        if (
+            write_operations
+            and writers
+            and write_errors / write_operations * 100 > self.load_params.error_threshold
+        ):
+            issues.append(
                 f"Write error rate is greater than threshold: {write_errors / write_operations * 100} > {self.load_params.error_threshold}"
             )
-        if read_operations and readers and read_errors / read_operations * 100 > self.load_params.error_threshold:
-            exceptions.append(
+        if (
+            read_operations
+            and readers
+            and read_errors / read_operations * 100 > self.load_params.error_threshold
+        ):
+            issues.append(
                 f"Read error rate is greater than threshold: {read_errors / read_operations * 100} > {self.load_params.error_threshold}"
             )
-        if delete_operations and deleters and delete_errors / delete_operations * 100 > self.load_params.error_threshold:
-            exceptions.append(
+        if (
+            delete_operations
+            and deleters
+            and delete_errors / delete_operations * 100 > self.load_params.error_threshold
+        ):
+            issues.append(
                 f"Delete error rate is greater than threshold: {delete_errors / delete_operations * 100} > {self.load_params.error_threshold}"
             )
 
-        assert not exceptions, "\n".join(exceptions)
+        return issues
 
-    def check_verify_results(self, load_summaries, verification_summaries) -> None:
-        for node_or_endpoint in load_summaries:
-            with reporter.step(f"Check verify scenario results for {node_or_endpoint}"):
-                self._check_verify_result(
-                    load_summaries[node_or_endpoint], verification_summaries[node_or_endpoint]
+    def collect_verify_issues(self, load_summaries, verification_summaries) -> list[str]:
+        verify_issues: list[str] = []
+        for k6_process_label in load_summaries:
+            with reporter.step(f"Check verify scenario results for {k6_process_label}"):
+                verify_issues.extend(
+                    self._collect_verify_issues_on_process(
+                        k6_process_label,
+                        load_summaries[k6_process_label],
+                        verification_summaries[k6_process_label],
+                    )
                 )
+        return verify_issues
 
-    def _check_verify_result(self, load_summary, verification_summary) -> None:
-        exceptions = []
+    def _collect_verify_issues_on_process(
+        self, label, load_summary, verification_summary
+    ) -> list[str]:
+        issues = []
 
         load_metrics = get_metrics_object(self.load_params.scenario, load_summary)
 
@@ -92,8 +112,8 @@ class LoadVerifier:
 
             # Due to interruptions we may see total verified objects to be less than written on writers count
             if abs(total_left_objects - verified_objects) > writers:
-                exceptions.append(
-                    f"Verified objects mismatch. Total: {total_left_objects}, Verified: {verified_objects}. Writers: {writers}."
+                issues.append(
+                    f"Verified objects mismatch for {label}. Total: {total_left_objects}, Verified: {verified_objects}. Writers: {writers}."
                 )
 
-        assert not exceptions, "\n".join(exceptions)
+        return issues
diff --git a/src/frostfs_testlib/load/runners.py b/src/frostfs_testlib/load/runners.py
index a7fa787..489ddcd 100644
--- a/src/frostfs_testlib/load/runners.py
+++ b/src/frostfs_testlib/load/runners.py
@@ -43,8 +43,8 @@ class RunnerBase(ScenarioRunner):
         parallel([k6.preset for k6 in self.k6_instances])
 
     @reporter.step_deco("Wait until load finish")
-    def wait_until_finish(self):
-        parallel([k6.wait_until_finished for k6 in self.k6_instances])
+    def wait_until_finish(self, soft_timeout: int = 0):
+        parallel([k6.wait_until_finished for k6 in self.k6_instances], soft_timeout=soft_timeout)
 
     @property
     def is_running(self):
diff --git a/src/frostfs_testlib/resources/load_params.py b/src/frostfs_testlib/resources/load_params.py
index bd99859..97193cc 100644
--- a/src/frostfs_testlib/resources/load_params.py
+++ b/src/frostfs_testlib/resources/load_params.py
@@ -13,6 +13,7 @@ BACKGROUND_DELETERS_COUNT = os.getenv("BACKGROUND_DELETERS_COUNT", 0)
 BACKGROUND_VERIFIERS_COUNT = os.getenv("BACKGROUND_VERIFIERS_COUNT", 0)
 BACKGROUND_LOAD_DEFAULT_TIME = os.getenv("BACKGROUND_LOAD_DEFAULT_TIME", 1800)
 BACKGROUND_LOAD_DEFAULT_OBJECT_SIZE = os.getenv("BACKGROUND_LOAD_DEFAULT_OBJECT_SIZE", 32)
+BACKGROUND_LOAD_DEFAULT_VU_INIT_TIME = float(os.getenv("BACKGROUND_LOAD_DEFAULT_VU_INIT_TIME", 0.8))
 BACKGROUND_LOAD_SETUP_TIMEOUT = os.getenv("BACKGROUND_LOAD_SETUP_TIMEOUT", "5s")
 
 # This will decrease load params for some weak environments
@@ -26,7 +27,7 @@ BACKGROUND_LOAD_CONTAINER_PLACEMENT_POLICY = os.getenv(
 BACKGROUND_LOAD_S3_LOCATION = os.getenv("BACKGROUND_LOAD_S3_LOCATION", "node-off")
 PRESET_CONTAINERS_COUNT = os.getenv("CONTAINERS_COUNT", "40")
 # TODO: At lease one object is required due to bug in xk6 (buckets with no objects produce millions exceptions in read)
-PRESET_OBJECTS_COUNT = os.getenv("OBJ_COUNT", "10")
+PRESET_OBJECTS_COUNT = os.getenv("OBJ_COUNT", "1")
 K6_DIRECTORY = os.getenv("K6_DIRECTORY", "/etc/k6")
 K6_TEARDOWN_PERIOD = os.getenv("K6_TEARDOWN_PERIOD", "30")
 K6_STOP_SIGNAL_TIMEOUT = int(os.getenv("K6_STOP_SIGNAL_TIMEOUT", 300))
diff --git a/src/frostfs_testlib/storage/controllers/background_load_controller.py b/src/frostfs_testlib/storage/controllers/background_load_controller.py
index 38cdf0f..a18a603 100644
--- a/src/frostfs_testlib/storage/controllers/background_load_controller.py
+++ b/src/frostfs_testlib/storage/controllers/background_load_controller.py
@@ -158,25 +158,27 @@ class BackgroundLoadController:
     @reporter.step_deco("Run post-load verification")
     def verify(self):
         try:
-            self._verify_load_results()
+            load_issues = self._collect_load_issues()
             if self.load_params.verify:
-                self._run_verify_scenario()
+                load_issues.extend(self._run_verify_scenario())
+
+            assert not load_issues, "\n".join(load_issues)
         finally:
             self._reset_for_consequent_load()
 
     @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
-    @reporter.step_deco("Verify load results")
-    def _verify_load_results(self):
+    @reporter.step_deco("Collect load issues")
+    def _collect_load_issues(self):
         verifier = LoadVerifier(self.load_params)
-        verifier.verify_load_results(self.load_summaries)
+        return verifier.collect_load_issues(self.load_summaries)
 
     @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
-    def wait_until_finish(self):
-        self.runner.wait_until_finish()
+    def wait_until_finish(self, soft_timeout: int = 0):
+        self.runner.wait_until_finish(soft_timeout)
 
     @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
     @reporter.step_deco("Verify loaded objects")
-    def _run_verify_scenario(self):
+    def _run_verify_scenario(self) -> list[str]:
         self.verification_params = LoadParams(
             verify_clients=self.load_params.verify_clients,
             scenario=LoadScenario.VERIFY,
@@ -185,6 +187,7 @@ class BackgroundLoadController:
             verify_time=self.load_params.verify_time,
             load_type=self.load_params.load_type,
             load_id=self.load_params.load_id,
+            vu_init_time=0,
             working_dir=self.load_params.working_dir,
             endpoint_selection_strategy=self.load_params.endpoint_selection_strategy,
             k6_process_allocation_strategy=self.load_params.k6_process_allocation_strategy,
@@ -199,10 +202,10 @@ class BackgroundLoadController:
             self.runner.start()
             self.runner.wait_until_finish()
 
-        with reporter.step("Check verify results"):
+        with reporter.step("Collect verify issues"):
             verification_summaries = self._get_results()
             verifier = LoadVerifier(self.load_params)
-            verifier.check_verify_results(self.load_summaries, verification_summaries)
+            return verifier.collect_verify_issues(self.load_summaries, verification_summaries)
 
     @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
     def _get_results(self) -> dict:
diff --git a/src/frostfs_testlib/testing/parallel.py b/src/frostfs_testlib/testing/parallel.py
index 7f4ee26..ebddd38 100644
--- a/src/frostfs_testlib/testing/parallel.py
+++ b/src/frostfs_testlib/testing/parallel.py
@@ -42,7 +42,7 @@ def parallel(
     exceptions = [future.exception() for future in futures if future.exception()]
     if exceptions:
         message = "\n".join([str(e) for e in exceptions])
-        raise RuntimeError(f"The following exceptions occured during parallel run: {message}")
+        raise RuntimeError(f"The following exceptions occured during parallel run:\n {message}")
     return futures