ZanderXu opened a new pull request, #4872:
URL: https://github.com/apache/hadoop/pull/4872
### Description of PR
ObserverNameNode currently can handle the addBlockLocation RPC, but it may
throw a FileNotFoundException when it contains stale txid.
- AddBlock is not a coordinated method, so Observer will not check the
statId.
- AddBlock does the validation with checkOperation(OperationCategory.READ)
So the observer namenode can handle the addBlock rpc, and it will throw a
FileNotFoundException during doing validation when this observer cannot replay
the edit of create file.
The related code as follows:
```
checkOperation(OperationCategory.READ);
final FSPermissionChecker pc = getPermissionChecker();
FSPermissionChecker.setOperationType(operationName);
readLock();
try {
checkOperation(OperationCategory.READ);
r = FSDirWriteFileOp.validateAddBlock(this, pc, src, fileId, clientName,
previous, onRetryBlock);
} finally {
readUnlock(operationName);
}
```
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