我已经安装了多台服务器运行的一个@Schedule
,它们运行向用户发送电子邮件的弹簧批处理作业。我想确保只有一个此作业的实例运行在多个服务器上。跨多个服务器执行单个作业
基于this问题 我已经实现了一些逻辑,看看它是否可能解决这个问题,只使用spring批处理。
运行我创建了一个辅助类JobRunner
以下方法工作:
public void run(Job job) {
try {
jobLauncher.run(job, new JobParameters());
} catch (JobExecutionAlreadyRunningException e) {
// Check if job is inactive and stop it if so.
stopIfInactive(job);
} catch (JobExecutionException e) {
...
}
}
的stopIfInactive
方法:
private void stopIfInactive(Job job) {
for (JobExecution execution : jobExplorer.findRunningJobExecutions(job.getName())) {
Date createTime = execution.getCreateTime();
DateTime now = DateTime.now();
// Get running seconds for more info.
int seconds = Seconds
.secondsBetween(new DateTime(createTime), now)
.getSeconds();
LOGGER.debug("Job '{}' already has an execution with id: {} with age of {}s",
job.getName(), execution.getId(), seconds);
// If job start time exceeds the execution window, stop the job.
if (createTime.before(now.minusMillis(EXECUTION_DEAD_MILLIS)
.toDate())) {
LOGGER.warn("Execution with id: {} is inactive, stopping",
execution.getId());
execution.setExitStatus(new ExitStatus(BatchStatus.FAILED.name(),
String.format("Stopped due to being inactive for %d seconds", seconds)));
execution.setStatus(BatchStatus.FAILED);
execution.setEndTime(now.toDate());
jobRepository.update(execution);
}
}
}
然后将作业的所有服务器上执行以下运行:
@Scheduled(cron = "${email.cron}")
public void sendEmails() {
jobRunner.run(emailJob);
}
这是一个多服务器的有效解决方案s etup?如果不是,有什么选择?
编辑1
我做更多的测试 - 设置其运行每5秒一个@Schedule
发起使用我创建的辅助类工作的两个应用程序。看来我的解决方案不能解决问题。下面是从batch_job_execution
表所使用的弹簧批量数据:
job_execution_id | version | job_instance_id | create_time | start_time | end_time | status | exit_code | exit_message | last_updated | job_configuration_location
------------------+---------+-----------------+-------------------------+-------------------------+-------------------------+-----------+-----------+--------------+-------------------------+----------------------------
1007 | 2 | 2 | 2016-08-25 14:43:15.024 | 2016-08-25 14:43:15.028 | 2016-08-25 14:43:16.84 | COMPLETED | COMPLETED | | 2016-08-25 14:43:16.84 |
1006 | 1 | 2 | 2016-08-25 14:43:15.021 | 2016-08-25 14:43:15.025 | | STARTED | UNKNOWN | | 2016-08-25 14:43:15.025 |
1005 | 2 | 2 | 2016-08-25 14:43:10.326 | 2016-08-25 14:43:10.329 | 2016-08-25 14:43:12.047 | COMPLETED | COMPLETED | | 2016-08-25 14:43:12.047 |
1004 | 2 | 2 | 2016-08-25 14:43:10.317 | 2016-08-25 14:43:10.319 | 2016-08-25 14:43:12.03 | COMPLETED | COMPLETED | | 2016-08-25 14:43:12.03 |
1003 | 2 | 2 | 2016-08-25 14:43:05.017 | 2016-08-25 14:43:05.02 | 2016-08-25 14:43:06.819 | COMPLETED | COMPLETED | | 2016-08-25 14:43:06.819 |
1002 | 2 | 2 | 2016-08-25 14:43:05.016 | 2016-08-25 14:43:05.018 | 2016-08-25 14:43:06.811 | COMPLETED | COMPLETED | | 2016-08-25 14:43:06.811 |
1001 | 2 | 2 | 2016-08-25 14:43:00.038 | 2016-08-25 14:43:00.042 | 2016-08-25 14:43:01.944 | COMPLETED | COMPLETED | | 2016-08-25 14:43:01.944 |
1000 | 2 | 2 | 2016-08-25 14:43:00.038 | 2016-08-25 14:43:00.041 | 2016-08-25 14:43:01.922 | COMPLETED | COMPLETED | | 2016-08-25 14:43:01.922 |
999 | 2 | 2 | 2016-08-25 14:42:55.02 | 2016-08-25 14:42:55.024 | 2016-08-25 14:42:57.603 | COMPLETED | COMPLETED | | 2016-08-25 14:42:57.603 |
998 | 2 | 2 | 2016-08-25 14:42:55.02 | 2016-08-25 14:42:55.023 | 2016-08-25 14:42:57.559 | COMPLETED | COMPLETED | | 2016-08-25 14:42:57.559 |
(10 rows)
我也试图通过@Palcente提供的方法,我已经得到了类似的结果。
您能解释一下在上述情况下不起作用吗?你是说同时运行同一项工作的多次执行? – DevG
是的,两台服务器同时启动相同的作业,即使它仍在其中一个节点上运行/启动。 – Edd