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https://issues.apache.org/jira/browse/HADOOP-18972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18028464#comment-18028464
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ASF GitHub Bot commented on HADOOP-18972:
-----------------------------------------

hadoop-yetus commented on PR #6272:
URL: https://github.com/apache/hadoop/pull/6272#issuecomment-3383403931

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   | GITHUB PR | https://github.com/apache/hadoop/pull/6272 |
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> Bug in SaslPropertiesResolver allows mutation of internal state
> ---------------------------------------------------------------
>
>                 Key: HADOOP-18972
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18972
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Charles Connell
>            Priority: Minor
>              Labels: pull-request-available
>
> When {{SaslDataTransferServer}} or {{SaslDataTranferClient}} want to get a 
> SASL properties map to do a handshake, they call 
> {{SaslPropertiesResolver#getServerProperties()}} or 
> {{SaslPropertiesResolver#getClientProperties()}}, and they get back a 
> {{Map<String, String>}}. Every call gets the same {{Map}} object back, and 
> then the callers sometimes call 
> [put()|https://github.com/apache/hadoop/blob/rel/release-3.3.6/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/SaslDataTransferServer.java#L385]
>  on it. This means that future users of {{SaslPropertiesResolver}} get back 
> the wrong information.
> I propose that {{SaslPropertiesResolver}} should pass a copy of its internal 
> map, so that users can safety modify them.
> I discovered this problem in my company's testing environment as we began to 
> enable {{dfs.data.transfer.protection}} on our DataNodes, while our NameNodes 
> were using {{IngressPortBasedResolver}} to give out block tokens with 
> different QOPs depending on the port used. Then our HDFS client applications 
> became unable to read or write to HDFS because they could not find a QOP in 
> common with the DataNodes during SASL handshake. With multiple threads 
> executing SASL handshakes at the same time, the properties map used in 
> {{SaslDataTransferServer}} in a DataNode could be clobbered during usage, 
> since the same map was used by all threads. Also, future clients that do not 
> have a QOP embedded in their block tokens would connect to a server with the 
> wrong SASL properties map. I think that one or both of these issues explains 
> the problem that I saw. I eliminated this unsafety and saw the problem go 
> away.



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