Please answer some questions before submitting your issue. Thanks!

### Which version of XXL-JOB do you using?
2.4.2-SNAPSHOT

看了一下类JobScheduleHelper，如果xxl-job重启，ringItemData里面的数据没有处理完，那么就会丢失任务


重启xxl-job,任务丢失
This is a GitHub Issue
repo:xxl-job
owner:xuxueli
Title : 重启xxl-job,任务丢失
Issue date:

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Please answer some questions before submitting your issue. Thanks!

### Which version of XXL-JOB do you using?
2.4.2-SNAPSHOT

看了一下类JobScheduleHelper，如果xxl-job重启，ringItemData里面的数据没有处理完，那么就会丢失任务


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