Brahma Reddy Battula commented on YARN-3410:

004-Patch overall LGTM,, One minor comment..[~rohithsharma] can you please 
update the following usage also as [~leftnoteasy] also pointed earlier...

+  private static void printUsage(PrintStream out) {
+    out.println("Usage: java ResourceManager [-format-state-store]");
+    out.println("                            "
+        + "[-remove-application-from-state-store <appId>]" + "\n");
+  }

Usage: yarn resourcemanager [-format-state-store]
                            [-remove..] <appId>

> YARN admin should be able to remove individual application records from 
> RMStateStore
> ------------------------------------------------------------------------------------
>                 Key: YARN-3410
>                 URL: https://issues.apache.org/jira/browse/YARN-3410
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager, yarn
>            Reporter: Wangda Tan
>            Assignee: Rohith
>            Priority: Critical
>         Attachments: 0001-YARN-3410-v1.patch, 0001-YARN-3410.patch, 
> 0001-YARN-3410.patch, 0002-YARN-3410.patch, 0003-YARN-3410.patch, 
> 0004-YARN-3410.patch
> When RM state store entered an unexpected state, one example is YARN-2340, 
> when an attempt is not in final state but app already completed, RM can never 
> get up unless format RMStateStore.
> I think we should support remove individual application records from 
> RMStateStore to unblock RM admin make choice of either waiting for a fix or 
> format state store.
> In addition, RM should be able to report all fatal errors (which will 
> shutdown RM) when doing app recovery, this can save admin some time to remove 
> apps in bad state.

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