Added integration testing for newly implemented settings.

src/Storages/MergeTree/MergeTreeDataWriter.cpp

@@ -562,7 +562,7 @@ MergeTreeDataWriter::TemporaryPart MergeTreeDataWriter::writeTempPartImpl(
 
         const auto disk = data_part_volume->getDisk();
         const UInt64 total_disk_bytes = *disk->getTotalSpace();
-        const UInt64 free_disk_bytes = *disk->getUnreservedSpace();
+        const UInt64 free_disk_bytes = *disk->getAvailableSpace();
 
         const UInt64 min_bytes_from_ratio = static_cast<UInt64>(min_ratio * total_disk_bytes);
         const UInt64 needed_free_bytes = std::max(min_bytes, min_bytes_from_ratio);
@@ -571,9 +571,10 @@ MergeTreeDataWriter::TemporaryPart MergeTreeDataWriter::writeTempPartImpl(
         {
             throw Exception(
                 ErrorCodes::NOT_ENOUGH_SPACE,
-                "Could not perform insert: less than {} free bytes in disk space. "
+                "Could not perform insert: less than {} free bytes in disk space ({}). "
                 "Configure this limit with user settings {} or {}",
                 needed_free_bytes,
+                free_disk_bytes,
                 "min_free_disk_bytes_to_throw_insert",
                 "min_free_disk_ratio_to_throw_insert");
         }

tests/integration/test_stop_insert_when_disk_close_to_full/configs/config.d/storage_configuration.xml

@@ -0,0 +1,19 @@
+<clickhouse>
+    <storage_configuration>
+        <disks>
+            <disk1>
+                <type>local</type>
+                <path>/disk1/</path>
+            </disk1>
+        </disks>
+        <policies>
+            <only_disk1>
+                <volumes>
+                    <main>
+                        <disk>disk1</disk>
+                    </main>
+                </volumes>
+            </only_disk1>
+        </policies>
+    </storage_configuration>
+</clickhouse>

tests/integration/test_stop_insert_when_disk_close_to_full/test.py

@@ -0,0 +1,51 @@
+import pytest
+from helpers.cluster import ClickHouseCluster, ClickHouseInstance
+from helpers.client import QueryRuntimeException
+
+cluster = ClickHouseCluster(__file__)
+
+node = cluster.add_instance(
+    "node",
+    main_configs=["configs/config.d/storage_configuration.xml"],
+    tmpfs=["/disk1:size=100M"],
+    macros={"shard": 0, "replica": 1},
+)
+
+@pytest.fixture(scope="module")
+def start_cluster():
+    try:
+        cluster.start()
+        yield cluster
+    finally:
+        cluster.shutdown()
+
+def test_insert_stops_when_disk_full(start_cluster):
+    min_free_bytes = 3 * 1024 * 1024  # 3 MiB
+
+    node.query(f"""
+        CREATE TABLE test_table (
+            id UInt32,
+            data String
+        ) ENGINE = MergeTree()
+        ORDER BY id
+        SETTINGS storage_policy = 'only_disk1', min_free_disk_bytes_to_throw_insert = {min_free_bytes}
+    """)
+
+    count = 0
+
+    # Insert data to fill up disk
+    try:
+        for _ in range(100000):
+            node.query("INSERT INTO test_table SELECT number, repeat('a', 1000 * 1000) FROM numbers(1)")
+            count += 1
+    except QueryRuntimeException as e:
+        assert "Could not perform insert" in str(e)
+        assert "free bytes in disk space" in str(e)
+
+    free_space = int(node.query("SELECT free_space FROM system.disks WHERE name = 'disk1'").strip())
+    assert free_space <= min_free_bytes, f"Free space ({free_space}) is less than min_free_bytes ({min_free_bytes})"
+
+    rows = int(node.query("SELECT count() from test_table").strip())
+    assert rows == count
+
+    node.query("DROP TABLE test_table")