TCPHandlerFactory creating TCPHandle is slow. Takes 6 sec within intranet

[daggerin3]

Environment

• OS version: Linux version 3.10.0-693.el7.x86_64
• JDK version: Java8
• ClickHouse Server version: 20.8.3 revision 54438
• ClickHouse Native JDBC version: 2.3-stable
• (Optional) Spark version: N/A
• (Optional) Other components' version: N/A

Error logs

2022.07.25 17:26:07.621819 [ 7644 ] {} TCPHandlerFactory: TCP Request. Address: [::ffff:172.22.254.xxx]:57314 2022.07.25 17:26:13.661146 [ 7644 ] {} TCPHandler: Connected ClickHouse client version 1.1.0, revision: 54380, database: xxx, user: xxx.

paste your error logs here JDBC return the correct results but slow.

Steps to reproduce

Everytime using that service

Other descriptions

1. Ping is ok, stable and fast
2. Tried to stop firewall on both machines
3. No error logs found in /var/log/clickhouse-server/clickhouse-server.err.log

Any suggestions will be grateful.

Warm Regards,

[daggerin3]

Thanks a lot. Problem solved. 1st DNS server is unreachable.

Issue can be closed.