adoroszlai commented on pull request #1454:
URL: https://github.com/apache/hadoop-ozone/pull/1454#issuecomment-701266985


   > thanks for identify this performance issue
   
   Credit goes to @elek who reported the problem, see HDDS-4285.
   
   > I'm not quite familar with tokens
   
   Neither am I, but we have some 
[doc](https://hadoop.apache.org/ozone/docs/1.0.0/security/secureozone.html#tokens-).
   
   > since it's a user token, suppose it has a much longer liveness than input 
and output stream object instance, right?
   
   It is a block token, specific to the block being written/read.  I think it's 
short-lived.
   
   
https://github.com/apache/hadoop-ozone/blob/d1ac423b3fe35c5d363b348108512440f08ee5f1/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/security/token/OzoneBlockTokenIdentifier.java#L41-L45


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