A. The most common problem with map-side joins is introducing a high level of code complexity.
This complexity has several downsides: increased risk of bugs and performance degradation.
Developers are cautioned to rarely use map-side joins.
B. The most common problem with map-side joins is lack of the avaialble map slots since map-side joins require a lot of mappers.
C. The most common problems with map-side joins are out of memory exceptions on slave nodes.
D. The most common problem with map-side join is not clearly specifying primary index in the join.
This can lead to very slow performance on large datasets.
Answer: C
This complexity has several downsides: increased risk of bugs and performance degradation.
Developers are cautioned to rarely use map-side joins.
B. The most common problem with map-side joins is lack of the avaialble map slots since map-side joins require a lot of mappers.
C. The most common problems with map-side joins are out of memory exceptions on slave nodes.
D. The most common problem with map-side join is not clearly specifying primary index in the join.
This can lead to very slow performance on large datasets.
Answer: C
Excellent article. Very interesting to read. I really love to read such a nice article. Thanks! keep rocking.Big data hadoop online training banagalore
ReplyDelete