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You have a job that uses a Pentaho MapReduce entry to read four input files, and that outputs words and their counts to one output file.
How should you set the number of reducer tasks?
Suggested Answer: A
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11 comments · newest first
IS
Isaac
11 months ago
Totally agree, 1 reducer keeps it simple!
TE
Terrilyn
11 months ago
Wait, can you really set it to blank? That sounds weird.
CE
Celeste
12 months ago
Blank or 0 doesn't make sense for reducers.
SH
Shonda
12 months ago
I think 4 reducers could speed things up!
TH
Thea
12 months ago
Setting it to 1 is usually the best option for this.
ME
Merrilee
1 year ago
I’m confused about whether setting it to 0 would even allow the job to run, but I guess it could mean no reducers are used at all.
CA
Catalina
1 year ago
I'm not entirely sure, but I feel like setting it to 4 might be overkill for just four input files.
LO
Lore
1 year ago
I think I remember that setting the number of reducers to 1 is often a safe choice for simple tasks like counting words.
PA
Pamela
1 year ago
I practiced a similar question where we had to decide on reducer tasks, and I think leaving it blank could lead to default settings being applied.
AU
Audria
1 year ago
Whoa, a BSOD? That's not good. I better check the system error info and see if I can find the root cause.
AL
Alesia
1 year ago
Hmm, I'm not totally confident on this one. I'll have to review the OSPF requirements again.