ClickHouse/tests/integration/test_cluster_copier/task0_description.xml

<clickhouse>
    <!-- How many simualteneous workers are posssible -->
    <max_workers>3</max_workers>

    <!-- Common setting for pull and push operations -->
    <settings>
        <connect_timeout>1</connect_timeout>
    </settings>

    <!-- Setting used to fetch data -->
    <settings_pull>
        <max_rows_in_distinct>0</max_rows_in_distinct>
    </settings_pull>

    <!-- Setting used to insert data -->
    <settings_push>
    </settings_push>

    <!-- Tasks -->
    <tables>
        <hits>
            <cluster_pull>cluster0</cluster_pull>
            <database_pull>default</database_pull>
            <table_pull>hits</table_pull>

            <cluster_push>cluster1</cluster_push>
            <database_push>default</database_push>
            <table_push>hits</table_push>

            <number_of_splits>2</number_of_splits>

            <enabled_partitions>3 4 5 6 1 2 0   </enabled_partitions>

            <!-- Engine of destination tables -->
            <engine>ENGINE=ReplicatedMergeTree PARTITION BY d % 3 ORDER BY (d, sipHash64(d)) SAMPLE BY sipHash64(d) SETTINGS index_granularity = 16</engine>

            <!-- Which sarding key to use while copying -->
            <sharding_key>d + 1</sharding_key>

            <!-- Optional expression that filter copying data -->
            <where_condition>d - d = 0</where_condition>
        </hits>
    </tables>

    <!-- Configuration of clusters -->
    <remote_servers>
    <cluster0>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s0_0_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <host>s0_0_1</host>
                <port>9000</port>
            </replica>
        </shard>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s0_1_0</host>
                <port>9000</port>
            </replica>
        </shard>
    </cluster0>

    <cluster1>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s1_0_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <host>s1_0_1</host>
                <port>9000</port>
            </replica>
        </shard>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s1_1_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <!-- Died replica -->
                <host>255.255.255.255</host>
                <port>9000</port>
            </replica>
        </shard>
    </cluster1>
    </remote_servers>

</clickhouse>