Even that is and old post, it seems that we are still there: https://forums.pentaho.com/threads/98127-Using-Samba-smbclient-in-Kettle/
I have been able to workaround the slowness problem by splitting the unzip step.
The red path is the slow one.By splitting the step and unzipping the files locally and then move the files to the samba share the performance is the expected one
Hi @Carlos Lopez,I am still experience this, it seems a Apache Commons VFS library as stated by Matt Casters in this old post https://forums.pentaho.com/threads/98127-Using-Samba-smbclient-in-Kettle/The workaround I posted works perfectly but it is not nice :( just it a workaround.I have found a a similar problem downloading files using SFTP download step into a samba mounted file system.First, Carte creates the empty file and then starts filling it. this is not efficient and take a lot of time.So it seems the same problem, unzipping and downloading into a mounted samba filesystem perform very bad. Both have in common the Apache Commons VFS so probably the solution should be there.
Thanks for your time
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