GitHub user BilgeKaanGencdogan created a discussion: Task dispatch fails with
connection refused error to worker host ip:1234
Before I began to describe the situation, I'd like to give the technical
details about the system;
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
`* Dolphinscheduler version; 3.2.0` and it is standalone, not cluster not
running on docker or k8s
```
*
[vaiz@prd-dolphin-n63 ~]$ free -h
total used free shared buff/cache available
Mem: 192Gi 64Gi 105Gi 2.4Gi 23Gi 124Gi
Swap: 8.0Gi 0B 8.0Gi
```
```
*
[vaiz@prd-dolphin-n63 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 97G 0 97G 0% /dev
tmpfs 97G 1.1M 97G 1% /dev/shm
tmpfs 97G 2.3G 94G 3% /run
tmpfs 97G 0 97G 0% /sys/fs/cgroup
/dev/mapper/rhel-root 202G 16G 187G 8% /
/dev/mapper/rhel-usr 10G 5.3G 4.8G 53% /usr
/dev/mapper/vgdata-lvdata 400G 20G 381G 5% /data
/dev/sda2 2.0G 439M 1.6G 22% /boot
/dev/sda1 2.0G 5.9M 2.0G 1% /boot/efi
tmpfs 20G 0 20G 0% /run/user/1007
tmpfs 20G 8.0K 20G 1% /run/user/1006
```
```
*
[vaiz@prd-dolphin-n63 ~]$ java --version
openjdk 11.0.24 2024-07-16 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.24.0.8-2) (build 11.0.24+8-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.24.0.8-2) (build 11.0.24+8-LTS, mixed
mode, sharing)
```
`both master and worker server's jvm_args_env.sh;`
```
*
[root@prd-dolphin-n63 bin]# cat /data/dolphin/master-server/bin/jvm_args_env.sh
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
-Xms32g
-Xmx32g
-Xmn16g
-XX:+IgnoreUnrecognizedVMOptions
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-Xloggc:gc.log
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=dump.hprof
-Duser.timezone=${SPRING_JACKSON_TIME_ZONE}
[root@prd-dolphin-n63 bin]# cat /data/dolphin/worker-server/bin/jvm_args_env.sh
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
-Xms32g
-Xmx32g
-Xmn16g
-XX:+IgnoreUnrecognizedVMOptions
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-Xloggc:gc.log
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=dump.hprof
-Duser.timezone=${SPRING_JACKSON_TIME_ZONE}
```
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Now, I am gonna drop 2 screenshots;
`First one is master-server's log:`
![Uploading Screenshot from 2025-10-02 13-13-56.png…]()
GitHub link: https://github.com/apache/dolphinscheduler/discussions/17571
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