First of all, apologies from my side for some new work on the an-worker nodes :(
In the parent task we realized that rack A4 has now 8 Hadoop worker nodes, I didn't realize that when planning the rack locations as described in T260445#6863444
I'd ask if you could help and try to balance some worker nodes again, since some of them are not yet in service and it would be easier for us to schedule downtime.
If possible, I'd ask if any of these nodes could be racked in a different place: an-worker[1129,1139-1141].eqiad.wmnet
The current distribution of hadoop worker nodes (without the aforementioned ones) is:
19 A 19 B 21 C 19 D
Meanwhile the distribution between the rows is:
1 A/1 5 A/2 2 A/3 4 A/4 2 A/5 5 A/7 5 B/2 1 B/3 5 B/4 5 B/7 3 B/8 5 C/2 4 C/3 7 C/4 4 C/7 1 C/8 6 D/2 4 D/4 2 D/5 6 D/7 1 D/8
What we are trying to do is to avoid more than 5/6 nodes for each rack. Adding an-worker[1129,1139-1141] to A4 means getting to 8, that is too much for us (for resiliency if a rack goes down etc..).
Thanks a lot for the patience!