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https://issues.apache.org/jira/browse/KYLIN-4178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nichunen resolved KYLIN-4178.
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Resolution: Fixed
> Job scheduler support safe mode
> --------------------------------
>
> Key: KYLIN-4178
> URL: https://issues.apache.org/jira/browse/KYLIN-4178
> Project: Kylin
> Issue Type: Improvement
> Reporter: ZhouKang
> Priority: Major
> Fix For: v3.0.0
>
>
> Job scheduler should support safe mode in case of the HBase cluster change.
> In xiaomi, we want update the HBase cluster from hbase0.98 to HBase 2.0. The
> history data can be migrated previously, but the job has been submitted will
> keep running and write data to the old cluster. So we need a method to ensure
> that, job create htable in the old cluster will write data to the old
> cluster, and the job have not create htable should not be scheduled.
> So we need job scheduler safe mode. Open safe mode before changing cluster
> config, the running jobs can run continuous, and the new job cannot be
> scheduled.
> After all running job finished, we can change the cluster config to the new
> one, and rest of job can be scheduled again.
>
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