服務器主機配置：
CPU：單核2GHz
RAM：2GB
DISK：30GB HDD

Citus部署配置：
Coordinator X 1 (192.168.7.129)
Worker X 2 (192.168.7.130，192.168.7.131)

基于上一篇文章安裝部署完Citus后。用psql命令登陸Coordinator節點：

psql -h 192.168.7.129 -p 5432 -U postgres

執行下列SQL語句

--創建表 create table test_table(id int, name varchar(16)); --表分片 SELECT master_create_distributed_table('test_table', 'id', 'hash'); --設定分片個數(2)及每個分片副本數(2) SELECT master_create_worker_shards('test_table', 2, 2); INSERT INTO test_table VALUES(1,'a'); INSERT INTO test_table VALUES(2,'b'); INSERT INTO test_table VALUES(3,'c'); INSERT INTO test_table VALUES(4,'d');--集群管理 --查看work節點 SELECT * from master_get_active_worker_nodes(); --元數據查看 SELECT * from master_get_table_metadata('test_table'); --分區查看 SELECT * from pg_dist_partition; --分片查看 SELECT * from pg_dist_shard; --分片分布查看 SELECT * from pg_dist_shard_placement;select * from test_table;id | name ----+------1 | a3 | c4 | d2 | b (4 行記錄)

當停止一個worker_02（192.168.7.131）后，Coordinator仍然能夠正常連接，數據也能正常取到，但是執行SQL查詢時會出現警告，可以推斷出其中的數據是從worker_01（192.168.7.131）上的副本中取得的。

select * from test_table; WARNING: connection error: 192.168.7.131:5432 描述: could not connect to server: No route to hostIs the server running on host "192.168.7.131" and acceptingTCP/IP connections on port 5432?id | name ----+------1 | a3 | c4 | d2 | b (4 行記錄)

當把兩個worker都停止后，Coordinator仍然能夠正常連接，但是SQL查詢已經取不到數據了。

select * from test_table; WARNING: connection error: 192.168.7.131:5432 描述: could not connect to server: No route to hostIs the server running on host "192.168.7.131" and acceptingTCP/IP connections on port 5432? WARNING: could not establish asynchronous connection after 5000 ms WARNING: connection error: 192.168.7.131:5432 描述: could not connect to server: No route to hostIs the server running on host "192.168.7.131" and acceptingTCP/IP connections on port 5432? WARNING: could not establish asynchronous connection after 5000 ms WARNING: connection error: 192.168.7.131:5432 描述: could not connect to server: No route to hostIs the server running on host "192.168.7.131" and acceptingTCP/IP connections on port 5432? ERROR: failed to execute task 4 《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

總結

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