The per-application ApplicationMaster is responsible for negotiating appropriate resource containers from the Scheduler, tracking their status, and monitoring their progress.
Each ApplicationMaster has the responsibility of negotiating appropriate resource containers from the scheduler, tracking their status, and monitoring their progress.
在这种情况下,请在工作Scheduler流程的开头添加活动。
In this case, add a Scheduler activity at the beginning of your workflow.
A property Downloader, PageProcessor, Scheduler, Pipeline is the Spider, these properties can be freely set by setting this property can perform different functions.
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