Rembrant777 commented on issue #402:
URL:
https://github.com/apache/incubator-uniffle/issues/402#issuecomment-1351719092
I suppose that the main reason caused this test case failure is
`rss.server.app.expired.withoutHeartbeat`'s value is too small.
It can be re-produced by adding a breakpoint on the client side(block client
response immediately), when the server side's
`ShuffleTaskManager`#`expiredAppCleanupExecutorService` detects that time is up
and the app gets expired it will invoke `removeResources` method to remove the
application(appId[case1]).
When the client tries to fetch a partition/block data from an expired
application it only receives an error message with the required data fields
blank and finally throws an exception.
Here are the error logs from the server side:
```
2022-12-14 23:56:45,238 INFO [clearResourceThread]
server.ShuffleTaskManager (ShuffleTaskManager.java:removeResources(477)) -
Start remove resource for appId[case1]
2022-12-14 23:56:45,238 ERROR [clearResourceThread]
server.ShuffleTaskManager (ShuffleTaskManager.java:lambda$new$3(136)) -
Exception happened when clear resource for expired application
java.lang.NullPointerException
at
org.apache.uniffle.server.ShuffleTaskManager.removeResources(ShuffleTaskManager.java:479)
at
org.apache.uniffle.server.ShuffleTaskManager.lambda$new$3(ShuffleTaskManager.java:130)
at java.lang.Thread.run(Thread.java:748)
```
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