cp created HDFS-16482:
-------------------------

             Summary: ObserverNamenode throw FileNotFoundException on addBlock 
                 Key: HDFS-16482
                 URL: https://issues.apache.org/jira/browse/HDFS-16482
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: dfsclient
    Affects Versions: 3.2.1
            Reporter: cp


dfsClient call ObsererNamenode throw FileNotFoundException:

```

        at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:2898)
        at 
org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.analyzeFileState(FSDirWriteFileOp.java:599)
        at 
org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.validateAddBlock(FSDirWriteFileOp.java:171)
        at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2777)
        at 
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:892)

```

should `addBlock` be a coordinated call?



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