Strange behavior after rebalance

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Hello,

I just added a new brick and then rebalanced. After I did that, I had some strange behavior on our cluster.


I was using a python script that did this on some nodes. 

import matplotlib
ImportError:libpng16.so.16: cannot open shared object file: No such file or directory


Which is weird because I listed it on the master node and it was there. I then logged in directly to each node that was “missing” the file and sure enough I got the same error. However, after I did:

$ls -l /mypython/lib/path/libpng16.so.16
/mypython/lib/path/libpng16.so.16 -> libpng16.so.16.22.0

I tried this script again and it worked! So this issue was just resolved by ls’ing the “missing” file. Is there a glusterfs explanation for this? Why is the file “missing” until I ask the shell to ls the file. These  nodes just mount my volume using mount -t glusterfs mymainnode:/brick, nothing too weird.

Jordan
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