johnny2002 opened a new issue #1720:
URL: https://github.com/apache/shardingsphere-elasticjob/issues/1720
## Feature Request
For some reason, we need to customize the JobInstance ID, so that we can
assign specific shard number to specific JobInstance.
And as I found in JobInstance.java, the JobInstance ID is fixed to IP
concate with JVM name. The code as following:
```java
public JobInstance() {
jobInstanceId = IpUtils.getIp() + DELIMITER +
ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
}
```
### Is your feature request related to a problem?
### Describe the feature you would like.
Suggest to check whether a "jobInstanceId" property is exists, if so, use IP
concat with this property instead of jvm name.
code like this:
```java
public JobInstance() {
String jobInstIdSuffix = System.getProperty("jobInstanceId");
if (jobInstIdSuffix == null) {
jobInstIdSuffix =
ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
}
jobInstanceId = IpUtils.getIp() + DELIMITER + jobInstIdSuffix;
}
```
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