In essence, the Benchmark End node has results but the preview is loading for eternity. Resetting the nodes, Restarting Knime etc. didn’t work (back then).
I do recall that I switch the workflows backend type to columnar and back to row based. While the Table writer node was running I tried previewing the timing results from the benchmark nodes. Since then the issue remains until just now.
You might decide to ignore this but I wanted to report the issue to you for visibility.
there might be a connection to an issue / behavior I identified in this post of mine:
In essence, as I see a striking similarity about what I suspect is happening in the temp folder, that lots and I mean “gazillions” of files are created and in order to render the preview, they must be consolidated.
The test workflow, if you haven’t seen it, is that one:
I can not really reproduce the issue, neither the gazillion files created nor any side effects while the table writer node is running.
However, I did notice unnecessary (un)marshalling of the JSON in the loop when run with the columnar backend. There is a ticket open (AP-22461) and it will be addressed for 5.3. The change should already be part of the nightly build. On my system I saw a speedup of ~4 for the loop (1:30min instead of 5:50min).
