cxzl25 opened a new pull request, #5542: URL: https://github.com/apache/hadoop/pull/5542
### Description of PR When `Client.Connection#setupConnection` encounters an `IOException`, it will try to update the server address. ([HADOOP-18365](https://issues.apache.org/jira/browse/HADOOP-18365)) When the address is re-parsed, it may be an unresolved address (`UnknownHostException`), which causes `Client.Connection#setupConnection` to fail to reconnect. ```java while (true) { try { if (server.isUnresolved()) { ``` Especially when DN is connected to NN, `BPServiceActor#bpNamenode` is only initialized once, which causes DN to never connect to NN before restarting. ### How was this patch tested? ### For code changes: - [ ] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')? - [ ] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation? - [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0](http://www.apache.org/legal/resolved.html#category-a)? - [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, `NOTICE-binary` files? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org
