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Print “hello world” every X seconds
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answered Oct 16 '12 at 6:05
Rohit JainRohit Jain
188k4141 gold badges353353 silver badges478478 bronze badges
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The way to check a HDFS directory's size?
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Prior to 0.20.203, and officially deprecated in 2.6.0:
hadoop fs -dus [directory]
Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:
hdfs dfs -du [-s] [-h] URI [URI …]
You can also run hadoop fs -help for more ...
How do I break out of a loop in Scala?
...= 0
while (i <= 1000 && sum <= 1000) { sum += 1; i += 1 }
(2) Throw an exception.
object AllDone extends Exception { }
var sum = 0
try {
for (i <- 0 to 1000) { sum += i; if (sum>=1000) throw AllDone }
} catch {
case AllDone =>
}
(2a) In Scala 2.8+ this is already pre-...
Find MongoDB records where array field is not empty
...lution:
ME.find({ pictures: { $exists: true, $ne: [] } })
Since MongoDB 2.6 release, you can compare with the operator $gt but could lead to unexpected results (you can find a detailled explanation in this answer):
ME.find({ pictures: { $gt: [] } })
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How do I parallelize a simple Python loop?
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202
Using multiple threads on CPython won't give you better performance for pure-Python code due t...
How to prevent auto-closing of console after the execution of batch file
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edited Jul 30 '13 at 20:52
Rob Kielty
7,14577 gold badges3434 silver badges5050 bronze badges
answe...
Difference of Maven JAXB plugins
I have determined that two JAXB plugins for Maven 2 exist, with some different configurations.
6 Answers
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Get table column names in MySQL?
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Alexis Wilke
14.2k77 gold badges5151 silver badges9898 bronze badges
answered Oct 6 '09 at 16:36
GregGreg
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