ecosystem/tracing/rdb/src/main/java/org/apache/shardingsphere/elasticjob/tracing/rdb/storage/repository/RDBJobEventRepository.java (7 lines):
	- line 213: // TODO log failure directly to output log, consider to be configurable in the future
	- line 233: // TODO log failure directly to output log, consider to be configurable in the future
	- line 260: // TODO log failure directly to output log, consider to be configurable in the future
	- line 280: // TODO log failure directly to output log, consider to be configurable in the future
	- line 307: // TODO log failure directly to output log, consider to be configurable in the future
	- line 345: // TODO log failure directly to output log, consider to be configurable in the future
	- line 363: // TODO log failure directly to output log, consider to be configurable in the future


kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/internal/failover/FailoverService.java (1 line):
	- line 226: // TODO Instead of using triggerJob, use executor for unified scheduling


registry-center/provider/zookeeper-curator/src/main/java/org/apache/shardingsphere/elasticjob/reg/zookeeper/ZookeeperRegistryCenter.java (1 line):
	- line 148: * // TODO sleep 500ms, let cache client close first and then client, otherwise will throw exception reference：https://issues.apache.org/jira/browse/CURATOR-157


kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/executor/ElasticJobExecutor.java (1 line):
	- line 136: // TODO Consider increasing the status of job failure, and how to handle the overall loop of job failure


kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/internal/snapshot/SnapshotService.java (1 line):
	- line 116: // TODO Decoupling ZooKeeper


kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/internal/trigger/TriggerListenerManager.java (1 line):
	- line 59: // TODO At present, it cannot be triggered when the job is running, and it will be changed to a stacked trigger in the future.


kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/internal/instance/InstanceService.java (1 line):
	- line 72: // TODO It's better to make it atomic