keith-turner opened a new issue #2124:
URL: https://github.com/apache/accumulo/issues/2124


   When a compactor sees an UnknownCompactionIdException when reporting status, 
it seems to stop working.  Below is an exception from when this happened.  The 
line numbers may a be a bit off as this exception was observed when testing the 
external compactions PR before it was merged.
   
   ```
   2021-05-25T22:55:06,091 [compaction.RetryableThriftCall] ERROR: Error in 
Thrift function, retrying ...
   org.apache.accumulo.core.compaction.thrift.UnknownCompactionIdException: null
        at 
org.apache.accumulo.core.compaction.thrift.CompactionCoordinatorService$updateCompactionStatus_result$updateCompactionStatus_resultStandardScheme.read(CompactionCoordinatorService.java:4339)
 ~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.core.compaction.thrift.CompactionCoordinatorService$updateCompactionStatus_result$updateCompactionStatus_resultStandardScheme.read(CompactionCoordinatorService.java:4325)
 ~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.core.compaction.thrift.CompactionCoordinatorService$updateCompactionStatus_result.read(CompactionCoordinatorService.java:4275)
 ~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:88) 
~[libthrift-0.12.0.jar:0.12.0]
        at 
org.apache.accumulo.core.compaction.thrift.CompactionCoordinatorService$Client.recv_updateCompactionStatus(CompactionCoordinatorService.java:149)
 ~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.core.compaction.thrift.CompactionCoordinatorService$Client.updateCompactionStatus(CompactionCoordinatorService.java:131)
 ~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.compactor.Compactor$2.execute(Compactor.java:390) 
~[accumulo-compactor-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.compactor.Compactor$2.execute(Compactor.java:385) 
~[accumulo-compactor-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.server.compaction.RetryableThriftCall.run(RetryableThriftCall.java:107)
 ~[accumulo-server-base-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at 
org.apache.accumulo.compactor.Compactor.updateCompactionState(Compactor.java:399)
 ~[accumulo-compactor-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at org.apache.accumulo.compactor.Compactor.run(Compactor.java:714) 
~[accumulo-compactor-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
        at java.lang.Thread.run(Thread.java:829) [?:?]
   ```


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