add test

tests/queries/0_stateless/02962_system_sync_replica_lightweight_from_modifier.reference

@@ -0,0 +1,2 @@
+Test completed
+Data consistency check passed

tests/queries/0_stateless/02962_system_sync_replica_lightweight_from_modifier.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+# Tags: zookeeper, no-parallel, no-fasttest
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+# shellcheck source=./replication.lib
+. "$CURDIR"/replication.lib
+
+TOTAL_REPLICAS=10
+REPLICAS_TO_DROP=7
+
+for i in $(seq $TOTAL_REPLICAS); do
+    $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS test_table_$i"
+    $CLICKHOUSE_CLIENT --query "CREATE TABLE test_table_$i (key UInt64, value UInt8) ENGINE = ReplicatedMergeTree('/clickhouse/tables/$CLICKHOUSE_TEST_ZOOKEEPER_PREFIX/test_table', '$i') ORDER BY key"
+done
+
+function insert_thread() {
+    while true; do
+        REPLICA=$(($RANDOM % $TOTAL_REPLICAS + 1))
+        $CLICKHOUSE_CLIENT --query "INSERT INTO test_table_$REPLICA VALUES ($RANDOM, $RANDOM % 255)"
+        sleep 0.$RANDOM
+    done
+}
+
+function sync_and_drop_replicas() {
+    for i in $(seq $REPLICAS_TO_DROP); do
+        $CLICKHOUSE_CLIENT --query "SYSTEM SYNC REPLICA LIGHTWEIGHT test_table_$i FROM '$i'"
+        $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS test_table_$i"
+    done
+}
+
+function optimize_thread() {
+    while true; do
+        REPLICA=$(($RANDOM % $TOTAL_REPLICAS + 1))
+        $CLICKHOUSE_CLIENT --query "OPTIMIZE TABLE test_table_$REPLICA FINAL"
+        sleep 0.$RANDOM
+    done
+}
+
+function mutations_thread() {
+    while true; do
+        REPLICA=$(($RANDOM % $TOTAL_REPLICAS + 1))
+        CONDITION="key % 2 = 0"
+        $CLICKHOUSE_CLIENT --query "ALTER TABLE test_table_$REPLICA DELETE WHERE $CONDITION"
+        sleep 0.$RANDOM
+    done
+}
+
+export -f insert_thread
+export -f sync_and_drop_replicas
+export -f optimize_thread
+export -f mutations_thread
+
+TIMEOUT=30
+
+timeout $TIMEOUT bash -c insert_thread 2> /dev/null &
+timeout $TIMEOUT bash -c sync_and_drop_replicas 2> /dev/null &
+timeout $TIMEOUT bash -c optimize_thread 2> /dev/null &
+timeout $TIMEOUT bash -c mutations_thread 2> /dev/null &
+
+wait
+
+echo "Test completed"
+
+lost_parts_count=$($CLICKHOUSE_CLIENT --query "SELECT SUM(lost_part_count) FROM system.replicas WHERE database=currentDatabase()")
+if [ "$lost_parts_count" -ne 0 ]; then
+    echo "Data consistency check failed: lost parts count is not zero"
+    exit 1
+fi
+
+echo "Data consistency check passed"
+
+for i in $(seq $TOTAL_REPLICAS); do
+    if [ $i -gt $REPLICAS_TO_DROP ]; then
+        $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS test_table_$i"
+    fi
+done