hfutatzhanghb commented on PR #5262:
URL: https://github.com/apache/hadoop/pull/5262#issuecomment-1368673356

   > > Yes,the src is not the dst path, but we can use the src to lookup real 
dst path in mount table. Here, we can not execute 
this.subclusterResolver.getMountPoints(path);, because the statement is 
time-consuming.
   > 
   > From correctness point of view it isn't correct. If `/mount/path` points 
to Ns0 `/dir` and we log` /mount/path` in the namenode, it can lead to 
confusions if the namenode also has a path named `/mount/path`, If you operate 
on `/dir` via router `/mount/path` and if you directly operate on `/mount/path` 
on the namenode.
   > 
   > If it has serious performance penalties we need to make it configurable 
and then figure out what can be done when the config is disabled.
   
   Thanks @ayushtkn again, i will continue to work on this problem.
   


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