Help Center/ DataArts Studio/ FAQs/ DataArts Migration (Offline Jobs)/ What Should I Do If Error Message "ru.yandex.clickhouse.except.ClickHouseUnknownException: ClickHouse exception, code: 1002, host: xxx failed to respond" Is Displayed When ClickHouse Is the Source?
Updated on 2026-03-20 GMT+08:00
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What Should I Do If Error Message "ru.yandex.clickhouse.except.ClickHouseUnknownException: ClickHouse exception, code: 1002, host: xxx failed to respond" Is Displayed When ClickHouse Is the Source?

Symptom

There is an offline data migration job with ClickHouse as the source. The driver version configured for the data connection is 0.3.1. The following error message is displayed when the job is running: "ru.yandex.clickhouse.except.ClickHouseUnknownException: ClickHouse exception, code: 1002, host: xxx failed to respond".

Figure 1 Error message

Possible Cause

There is a native problem with the ClickHouse driver, which result in a failure to create a connection in the thread pool.

Solution

Change the driver version from 0.3.1 to 0.4.2 for the data connection.