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Spark java.lang.OutOfMemoryError: Java heap space

...sible by checking the UI (it will say how much mem you're using) Try using more partitions, you should have 2 - 4 per CPU. IME increasing the number of partitions is often the easiest way to make a program more stable (and often faster). For huge amounts of data you may need way more than 4 per CPU...
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Declaring variables inside loops, good practice or bad practice?

...lsewhere. Last but not least, some dedicated optimization can be performed more efficiently by the compiler (most importantly register allocation), since it knows that the variable cannot be used outside of the loop. For example, no need to store the result for later re-use. In short, you are righ...
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How do I download a binary file over HTTP?

... More platform-specific solutions: GNU/Linux platforms provide wget. OS X provides curl (curl http://oh.no/its/pbjellytime.flv --output secretlylove.flv). Windows has a Powershell equivalent (new-object System.Net.WebClient).D...
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Is recursion ever faster than looping?

... Also, recursion is, in general, the more natural approach in functional languages, and iteration is normally more intuitive in imperative languages. The performance difference is unlikely to be noticeable, so just use whatever feels more natural for that partic...
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Why use ICollection and not IEnumerable or List on many-many/one-many relationships?

...full list: http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx). From a more specific standpoint, lazy loading comes in to play with choosing the type. By default, navigation properties in Entity Framework come with change tracking and are proxies. In order for the dynamic proxy to be created as ...
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How to print a string in fixed width?

... This is far more intuitive and concise than the new str.format. I don't understand why there is this push in python towards convolution – scottmrogowski Jun 6 '14 at 0:39 ...
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Error java.lang.OutOfMemoryError: GC overhead limit exceeded

...r as follows: "It's just like an 'Out of Java Heap space' error. Give it more memory with -Xmx." ? – Tim Cooper Jun 19 '10 at 13:28 61 ...
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Java's Virtual Machine and CLR

...use they're already encoded in the instruction), but that means it needs a more complex bytecode format, with more instruction types. I've been using Java (and admiring the JVM) for about ten years now. But, in my opinion, the CLR is now the superior implementation, in almost every way. ...
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How to grep for two words existing on the same line? [duplicate]

...s are pretty much the last place you want to go for clarification. They're more confusing than randomly guessing. – corsiKa Jun 25 '11 at 21:45 5 ...
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Git branch strategy for small dev team [closed]

... code in a less stable branch will eventually "graduate" to one considered more stable after testing and general approval by your team. Step by step, your workflow under this model might look like this: You need to fix a bug. Create a branch called myfix that is based on the develop branch. Work ...