在kettle中，用MYSQL表输入插件和doris stream loader插件写入到doris报错，请各位兄弟伙支支招，看是怎么回事

2026/01/26 15:50:28 - Doris Stream loader.0 - ERROR (version 9.4.0.0-343, build 0.0 from 2022-11-08 07.50.27 by buildguy) : worker running error
2026/01/26 15:50:28 - Doris Stream loader.0 - ERROR (version 9.4.0.0-343, build 0.0 from 2022-11-08 07.50.27 by buildguy) : org.pentaho.di.trans.steps.dorisstreamloader.load.DorisRuntimeException: stream load error: Connect to 172.18.9.47:8040 [/172.18.9.47] failed: Connection timed out: connect
2026/01/26 15:50:28 - Doris Stream loader.0 - at org.pentaho.di.trans.steps.dorisstreamloader.load.DorisBatchStreamLoad$LoadAsyncExecutor.load(DorisBatchStreamLoad.java:526)
2026/01/26 15:50:28 - Doris Stream loader.0 - at org.pentaho.di.trans.steps.dorisstreamloader.load.DorisBatchStreamLoad$LoadAsyncExecutor.run(DorisBatchStreamLoad.java:414)