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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...s dfs instead.
hdfs dfs <args>
same as 2nd i.e would work for all the operations related to HDFS and is the recommended command instead of hadoop dfs
below is the list categorized as hdfs commands.
namenode|secondarynamenode|datanode|dfs|dfsadmin|fsck|balancer|fetchdt|oiv|dfsgroups
...
Easy way to list node modules I have npm linked?
...ts (e.g. ls -l node_modules | grep ^l)? They're normal symlinks.
If you really need to find all symlinks, you could try something like find / -type d -name "node_modules" 2>/dev/null | xargs -I{} find {} -type l -maxdepth 1 | xargs ls -l.
...
Cannot truncate table because it is being referenced by a FOREIGN KEY constraint?
...rrect; you cannot truncate a table which has an FK constraint on it.
Typically my process for this is:
Drop the constraints
Trunc the table
Recreate the constraints.
(All in a transaction, of course.)
Of course, this only applies if the child has already been truncated. Otherwise I go a differ...
How can I ignore everything under a folder in Mercurial
I am looking for an expression for the .hgignore file, to ignore all files beneath a specified folder.
6 Answers
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Sequence-zip function for c++11?
...ike the c++ stdlib.
template <typename Iterator>
void advance_all (Iterator & iterator) {
++iterator;
}
template <typename Iterator, typename ... Iterators>
void advance_all (Iterator & iterator, Iterators& ... iterators) {
++iterator;
a...
Do you use NULL or 0 (zero) for pointers in C++?
...ded. That's less common these days.
If you have to name the null pointer, call it nullptr; that's what it's called in C++11. Then, nullptr will be a keyword.
That said, don't sweat the small stuff.
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Set attribute without value
... answered Oct 31 '12 at 13:37
Callum McLeanCallum McLean
1,20177 silver badges1212 bronze badges
...
C++ new int[0] — will it allocate memory?
... When the value of the expression in a direct-new-declarator is zero, the allocation function is called to allocate an array with no elements.
From 3.7.3.1/2
The effect of dereferencing a pointer returned as a request for zero size is undefined.
Also
Even if the size of the space reques...
How to convert decimal to hexadecimal in JavaScript
...) to hex and back using this technique. The question you linked is specifically referencing numbers too large to fit into a Double (hence the string representation in the question). If you've got a Number then this will work. If you have something too big to be a javascript Number object (a Double) ...
Determine if a function exists in bash
..., built-in function, external command, or just not defined. Example:
$ LC_ALL=C type foo
bash: type: foo: not found
$ LC_ALL=C type ls
ls is aliased to `ls --color=auto'
$ which type
$ LC_ALL=C type type
type is a shell builtin
$ LC_ALL=C type -t rvm
function
$ if [ -n "$(LC_ALL=C type -t rvm)...