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What is the purpose of shuffling and sorting phase in the reducer in Map Reduce Programming?
...nce the reducers get data from many mappers).
Partitioning, that you mentioned in one of the answers, is a different process. It determines in which reducer a (key, value) pair, output of the map phase, will be sent. The default Partitioner uses a hashing on the keys to distribute them to the reduc...
Warning: push.default is unset; its implicit value is changing in Git 2.0
...marize:
matching means git push will push all your local branches to the ones with the same name on the remote. This makes it easy to accidentally push a branch you didn't intend to.
simple means git push will push only the current branch to the one that git pull would pull from, and also checks ...
How to read a file without newlines?
... Note that [line.rstrip('\n') for line in file] will remove more than one trailing \n.
– Wes Turner
Dec 31 '15 at 19:20
1
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RE error: illegal byte sequence on Mac OS X
...ct can be had ad-hoc for a single command only:
LC_ALL=C sed -i "" 's|"iphoneos-cross","llvm-gcc:-O3|"iphoneos-cross","clang:-Os|g' Configure
Note: What matters is an effective LC_CTYPE setting of C, so LC_CTYPE=C sed ... would normally also work, but if LC_ALL happens to be set (to something oth...
Why should I use version control? [closed]
...anted to review the history of some code?
Wanted to submit a change to someone else's code?
Wanted to share your code, or let other people work on your code?
Wanted to see how much work is being done, and where, when and by whom?
Wanted to experiment with a new feature without interfering with work...
Do subclasses inherit private fields?
...ublic are inherited by subclasses
declared in a package other than the
one in which the class is declared.
This addresses the exact question posed by the interviewer: "do subCLASSES inherit private fields". (emphasis added by me)
The answer is No. They do not. OBJECTS of subclasses contain...
Compiling with g++ using multiple cores
...
There is no such flag, and having one runs against the Unix philosophy of having each tool perform just one function and perform it well. Spawning compiler processes is conceptually the job of the build system. What you are probably looking for is the -j (job...
MIN and MAX in C
...; \
__typeof__ (b) _b = (b); \
_a > _b ? _a : _b; })
Everyone says "oh I know about double evaluation, it's no problem" and a few months down the road, you'll be debugging the silliest problems for hours on end.
Note the use of __typeof__ instead of typeof:
If you are writing a...
What is the most frequent concurrency issue you've encountered in Java? [closed]
...possible issues but also in what issues are most common. So, please leave one specific answer of a Java concurrency bug per comment and vote up if you see one you've encountered.
...
Unnecessary curly braces in C++?
...
One possible purpose is to control variable scope. And since variables with automatic storage are destroyed when they go out of scope, this can also enable a destructor to be called earlier than it otherwise would.
...