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新浪是如何分析处理32亿条实时日志的？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...x open files等；App Level的优化如Java运行环境版本的选择，ES_HEAP_SIZE的设置，修改bulk index的queue size等，另外还设置了默认的index template，目的是更改默认的shard，replica数并将string改为not_analyzed，开启doc_values以应对elasticsearch进程OOM...
Change priorityQueue to max priorityqueue
...ate for long integers due to overflow. For example, numbers y = Integer.MIN_VALUE and x = 5 results in positive number. It is better to use new PriorityQueue<>((x, y) -> Integer.compare(y, x)). Though, the better solution is given by @Edwin Dalorzo to use Collections.reverseOrder().
...
How to export DataTable to Excel
...lFilePath);
Extension method for DataTable class:
public static class My_DataTable_Extensions
{
// Export DataTable into an excel file with field names in the header line
// - Save excel file without ever making it visible if filepath is given
// - Don't save excel file, just make it...
Which regular expression operator means 'Don't' match this character?
...;>> re.match('[^f]', 'foo')
>>> re.match('[^f]', 'bar')
<_sre.SRE_Match object at 0x7f8b102ad6b0>
>>> re.match('(?!foo)...', 'foo')
>>> re.match('(?!foo)...', 'bar')
<_sre.SRE_Match object at 0x7f8b0fe70780>
...
Case-insensitive string comparison in C++ [closed]
...
Take advantage of the standard char_traits. Recall that a std::string is in fact a typedef for std::basic_string<char>, or more explicitly, std::basic_string<char, std::char_traits<char> >. The char_traits type describes how characters compar...
How would you count occurrences of a string (actually a char) within a string?
... 134| 1853| 95| 1146| 671|
LukeH_1 | 346| 4490| N/A| N/A| N/A|
LukeH_2 | 152| 1569| 197| 2425| 2171|
Bobwienholt | 230| 3269| N/A| N/A| ...
How to convert a String to CharSequence?
...value join with alternatives:
(x$1: CharSequence,x$2: java.lang.Iterable[_ <: CharSequence])String <and>
(x$1: CharSequence,x$2: CharSequence*)String
cannot be applied to (String, Iterable[String])
val header = String.join(",", cols)
I was able to fix this problem with the rea...
Python add item to the tuple
..., works the same in python3 and python2.7.
– ILMostro_7
Jun 15 '18 at 11:42
5
...
AtomicInteger lazySet vs. set
...erve as a soft barrier costing 20 cycles on nehelem intel cpu)
on x86 (x86_64) such a barrier is much cheaper performance-wise than volatile or AtomicLong getAndAdd ,
In an one producer, one consumer queue scenario, xchg soft barrier can force the line of codes before the lazySet(sequence+1) for ...
AngularJS : Prevent error $digest already in progress when calling $scope.$apply()
...l automatically have an apply run afterwards
});
or if you have lodash:
_.defer(function(){$scope.$apply();});
We tried several workarounds, and we hated injecting $rootScope into all of our controllers, directives, and even some factories. So, the $timeout and _.defer have been our favorite so...