tasanuma commented on pull request #3564:
URL: https://github.com/apache/hadoop/pull/3564#issuecomment-952599759


   @tomscut Thanks for the explanation. When `nodeID` is DatanodeRegistration 
(I think it is most likely case), `DatanodeRegistration#toString()` is most 
informative.
   
   `nodeID.getDatanodeUuid()`:
   ```
   BLOCK* processReport 0x51eb6427619ccf8f: Processing first storage report for 
DS-ced48a3c-7e37-4a94-9cf9-404e07e659a7 from datanode 
a7a8fd2f-e0cd-40a4-8fcd-65760b6bc6e6
   ```
   
   `nodeID.getXferAddrWithHostname()`:
   ```
   BLOCK* processReport 0x5006fb6a4251db51: Processing first storage report for 
DS-ced48a3c-7e37-4a94-9cf9-404e07e659a7 from datanode hostname:11001
   ```
   
   `nodeID`:
   ```
   BLOCK* processReport 0xe518c3bd634f15e6: Processing first storage report for 
DS-0048bf1d-84da-444c-8c3f-251dab39f1dc from datanode 
DatanodeRegistration(127.0.0.1:11000, 
datanodeUuid=64886279-5799-47a6-96ba-653e3675e816, infoPort=11020, 
infoSecurePort=0, ipcPort=11010, 
storageInfo=lv=-57;cid=CID-130467d5-c200-4869-9330-d9eedf4f3909;nsid=930729152;c=1635316881247)
   ```
   
   So just using `nodeID` looks good to me.
   
   > because changing the toString() of the datanodeID or DatanodeRegistration 
might cause other compatibility issues.
   
   I agreed. Let's keep it as it was.


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