I wanted to use the function
Std.Str.combinewords(r, ',');
and found, that it only takes SET OF STRING as input. I had a dataset of a record type containing one string with the name "word". The solution is to call the SET function on the dataset (t in this example):
SET OF STRING r := SET(t, word);
One of my ECL programs suddenly stopped working. Whenever I started the workunit, the status stayed "blocked" and it timed out eventually.
hpcc-run.sh status
showed that mythor was stopped. Restarting it didn't help. The start of mythor also timed out. I found helpful error messages in /var/log/HPCCSystems/cluster/cc_hpcc-init_status_*.log. In my case I found
... xyz.xyz.xyz.41: Running sudo /etc/init.d/hpcc-init start tee: /tmp/hpcc_status_20160629_104057_105636: Read-only file system ...
The issue was a hardware defect causing one node in the cluster to switch to a read-only filesystem. After fixing the defect, I could start mythor again.
Set the configuration of the Job to:
conf.set("mapreduce.input.fileinputformat.split.minsize", "" + Long.MAX_VALUE);
Hadoop required individual Key or Value classes to come with a constructor without parameters, such as GroupJoinVal() {}.
Das Problem scheint mit dem Update KB3097877 zusammenzuhängen, welches man unter Systemsteuerung > Installierte Updates anzeigen > Rechter Mausklick darauf > Deinstallieren wieder entfernen kann.
Damit es nicht beim nächsten Updatelauf wieder installiert wird kann man es ausschließen in der Systemsteuerung > Nach Updates suchen > rechter Mausklick auf dem Update > ausblenden.