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What is an SSTable?
...nally, each SSTable contains a sequence of blocks (typically each block is 64KB in size, but this is configurable). A block index (stored at the end of the SSTable) is used to locate blocks; the index is loaded into memory when the SSTable is opened. A lookup can be performed with a single disk seek...
AtomicInteger lazySet vs. set
...rve 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 p...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
..."age" : 24, "name" : "shane" }
证明数据导入成功
上面演示的是导入JSON格式的文件中的内容，如果要导入CSV格式文件中的内容，则需要通过--type参数指定导入格式，具体如下所示：
先删除数据
> db.students.remove()
> db.students.find()
...
How to get ASCII value of string in C#
...wered Dec 30 '08 at 16:28
LeppyR64LeppyR64
4,66211 gold badge2626 silver badges3232 bronze badges
...
Converting a Java Keystore into PEM Format
... pub:
00:e2:66:5c:e0:2e:da:e0:6b:a6:aa:97:64:59:14:
7e:a6:2e:5a:45:f9:2f:b5:2d:f4:34:27:e6:53:c7:
bash$ keytool -importkeystore -srckeystore foo.jks \
-destkeystore foo.p12 \
-srcstoretype jks \
-deststoretype pkcs12
Enter ...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...子节点
XmlNodeList childlist=root.ChildNodes;
//判断该节点下是否有子节点
root.HasChildNodes;
//获取同名同级节点集合
XmlNodeList nodelist=xml.SelectNodes("/Root/News");
//生成一个新节点
XmlElement node=xml.CreateElement("News");
//将节点加到指定...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
...nt font.   is slightly bigger. I can see the difference in Chrome 64 and FireFox 58.
– Dmitry
Mar 7 '18 at 14:00
...
Pandas percentage of total with groupby
...1orerexp1orer
8,07255 gold badges2929 silver badges4646 bronze badges
1
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Why does Java switch on contiguous ints appear to run faster with added cases?
... ; - javaapplication4.Test1::multiplyByPowerOfTen@64 (line 66)
; {section_word}
0x00000000024f01b7: jmp 0x00000000024f01cb
0x00000000024f01b9: mulsd xmm0,QWORD PTR [rip+0xffffffffffffff67] # 0x00000000024f0128
...
FAQ Section: SMS - Frequently Asked Questions - MIT App Inventor Community
....preloader-image")
if(splashImage){splashImage.src=`data:image/svg+xml;base64,${encodedSvg}`
const e=(performance.timing.connectStart||0)+2e3
let s,a
const r=()=>{splashWrapper&&splashWrapper.style.setProperty("--animation-state","running"),svgElement&&svgElement.style.setProperty("--animation-state...