看issue https://github.com/citusdata/citus/discussions/7206應該是網路不通，但是連線本地節點，那唯一的可能應該就是被kill或者工作節點掛了。模擬參見：https://blog.csdn.net/fm0517/article/details/79397826
lightdb WARNING: could not establish connection after 30000 ms
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