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Zhijie Shen commented on YARN-925: ---------------------------------- BTW, getAllApplications(...) might trouble the cache implementation as well. I'm not sure what the implementation the cache will be, but let's say if application 1 - 3 are cached, and getAllApplications(...) is supposed to retrieve application 1 - 5, what should cache do? If cache is touched only, the user will miss two 2 applications; If we resort to history store, we will get all the applications, but we lose change to make use of the cache for application 1 - 3. Importantly, before we touch the history store, we don't know what application is missing in the cache. > HistoryStorage Reader Interface for Application History Server > -------------------------------------------------------------- > > Key: YARN-925 > URL: https://issues.apache.org/jira/browse/YARN-925 > Project: Hadoop YARN > Issue Type: Sub-task > Reporter: Mayank Bansal > Assignee: Mayank Bansal > Fix For: YARN-321 > > Attachments: YARN-925-1.patch, YARN-925-2.patch, YARN-925-3.patch, > YARN-925-4.patch, YARN-925-5.patch > > -- This message was sent by Atlassian JIRA (v6.1#6144)