Hi,
back from a long sickness period I today stumbled across this rather elusive issue:
ERROR XPath 3:1126:0:972:0:1320 Execute failed: Blob file location "C:\Program Files\knime_5.2.0\col_32\000\000" does not exist
It was reproducible but after dis- and reconnecting the component, it resolved itself. Hence, I have nothing else to share.
Best
Mike
@qdmt can you check, as I missed doing it back then, the Windows Defender logs? Search for “Defender” then select “Protection history”.
I faced it again right after waking up my PC from sleep mode (uncertain which sleep state S1, S2, S3 or S4 it was in).
Thread Dump
240814 Blob file does not exist - Post 77070 threaddump-1723634674548.tdump.txt (90.1 KB)
It appeared on both nodes when I attempted to regenerate the temp data, though.
2024-08-14 13:21:16,494 ERROR XPath 3:1577:0:1671 Execute failed: Blob file location "C:\Program Files\knime_5.3.0\col_29\000\000" does not exist
[...]
2024-08-14 13:21:30,367 ERROR Row Splitter (deprecated) 3:1577:0:1670 Execute failed: Blob file location "C:\Program Files\knime_5.3.0\col_29\000\000" does not exist
Best
Mike
I found an old ticket fitting the description (AP-11062) and attached this topic to it.
Unfortunately, the ticket is still open and it seems we are unsure what exactly removes the blob file temp directory. The path that gets printed is just a concatenation of the program path (path to installation dir) and the relative path of the blob file.
I cannot spot anything interesting in the thread dump, unfortunately. It is also mostly useful to identify issues if something is deadlocked or appears to be stuck. In cases like this, the knime.log or hints to reproduce are more helpful. But I guess this does occur so rarely, that it is hard to reproduce.
At your service … here is the knime log 
I got everything from the first log line containing “blob” and about 30 minutes preceding that.
240814 Blob file does not exist - Knime Log - Forum Post 77070.txt (434.0 KB)