TeslaCN opened a new issue, #2162:
URL: https://github.com/apache/shardingsphere-elasticjob/issues/2162
## Bug Report
### Which version of ElasticJob did you use?
3.0.2
### Which project did you use? ElasticJob-Lite or ElasticJob-Cloud?
ElasticJob-Lite
### Expected behavior
No NPE occur.
### Actual behavior
```
java.lang.NullPointerException: null
at java.io.StringReader.<init>(StringReader.java:50)
at org.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:56)
at org.yaml.snakeyaml.Yaml.loadAs(Yaml.java:457)
at
org.apache.shardingsphere.elasticjob.infra.yaml.YamlEngine.unmarshal(YamlEngine.java:50)
at
org.apache.shardingsphere.elasticjob.lite.internal.instance.InstanceService.getAvailableJobInstances(InstanceService.java:72)
```
### Reason analyze (If you can)
The current logic in `getAvailableJobInstances` is not atomic. The instance
node may be removed after `getJobNodeChildrenKeys`.
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