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Difference between HBase and Hadoop/HDFS
...FS allows you store huge amounts of data in a distributed (provides faster read/write access) and redundant (provides better availability) manner. And MapReduce allows you to process this huge data in a distributed and parallel manner. But MapReduce is not limited to just HDFS. Being a FS, HDFS lack...
How to pipe input to a Bash while loop and preserve variables after loop ends
...
The correct notation for Process Substitution is:
while read i; do echo $i; done < <(echo "$FILECONTENT")
The last value of i assigned in the loop is then available when the loop terminates.
An alternative is:
echo $FILECONTENT |
{
while read i; do echo $i; done
...do othe...
How to loop through file names returned by find?
....txt' -exec process {} \; (see the bottom of this post). If you have time, read through the rest to see several different ways and the problems with most of them.
The full answer:
The best way depends on what you want to do, but here are a few options. As long as no file or folder in the subtree...
Why is volatile needed in C?
...erface with hardware that changes the value itself; when there's another thread running that also uses the variable; or when there's a signal handler that might change the value of the variable.
Let's say you have a little piece of hardware that is mapped into RAM somewhere and that has two address...
What is an alternative to execfile in Python 3?
...ation, instead of
execfile("./filename")
Use
exec(open("./filename").read())
See:
What’s New In Python 3.0
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Downloading images with node.js [closed]
...
fs.writeFileSync('image.png', data.read());
});
}).end();
The newest Node versions won't work well with binary strings, so merging chunks with strings i...
Easiest way to read from and write to files
There are a lot of different ways to read and write files ( text files , not binary) in C#.
12 Answers
...
When to use SELECT … FOR UPDATE?
...s without specifying FOR UPDATE explicitly.
To solve this problem, Thread 1 should SELECT id FROM rooms FOR UPDATE, thereby preventing Thread 2 from deleting from rooms until Thread 1 is done. Is that correct?
This depends on the concurrency control your database system is using.
MyISAM in...
What's the best way to learn LISP? [closed]
... in Python, PHP, Java and C for a couple or years now, and I just finished reading Hackers and Painters, so I would love to give LISP a try!
...
How to secure MongoDB with username and password
...er(
{
user: "myNormalUser",
pwd: "xyz123",
roles: [ { role: "readWrite", db: "some_db" },
{ role: "read", db: "some_other_db" } ]
}
)
4) Stop the MongoDB instance and start it again with access control.
mongod --auth --dbpath /data/db
5) Connect and authenticate as ...