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with two order implementation, the associated column Parition key, the associated columns C1, and the table's tag group key, according to Parition key to allocate reduce. Sorted by group key within the same reduce). Issue 2: Correlation of different data type IDs results in data skew issues. A log of a table S8, a record of each item, to be associated with a commodity table. But the association has encountered the problem of tilt. The
hadoop universal association (the Association is achieved through secondary sorting, the associated column is the parition key, the associated column C1 and the table tag constitute the group key for sorting, distribute reduce according to the parition key. Sort group keys in the same reduce ). Question 2: Different data type IDsWill cause data skew. One Table s8 log, one record for each item, must be associated with the item table. However, Associa
constant pool, if any, returns a reference to the string, and if not, adds its own string into the constant pool.the benefits of a constant poolChang is to avoid the frequent creation and destruction of objects and affect the performance of the system, which realizes the sharing of objects.For example, a string constant pool in which all string literals are placed in a constant pool during the compilation phase.(1) Save memory Space: All the same string constants in a constant pool are merged,
, even if they are assigned to different reduce. Attached is the implementation method of the General Hadoop Association (the association is implemented by two order, the associated column Parition key, the associated columns C1 and the table tag composition of the sorted group key, according to the Parition key allocation reduce. Sorted within the same reduce according to group key). Issue 2: The Association of different data type IDs produces data skew issues. A table
data skew problem. A table S8 log, one record for each item, and the commodity table to associate. But the connection has a skewed problem. 32 of the S8 log has a string commodity ID and a numeric commodity ID, and the type in the log is string, but the value ID in the product is bigint. The reason for guessing the problem is that the S8 's product ID is convert
height.Resolution Resolution is the measurement of sample density, and the bitmap resolution represents the relationship between pixel size and physical size. The maximum unit of measurement used is the PPI, the number of pixels on a per-foot distance.Fig. 1-4 Sampling SquaresThe letter "A" is magnified 16 times after the raster format, using a circle to represent the pixel point.Mega megapixel Megapi
, but Apple is not in the rest, not only in the product progress, but there is a decline in suspicion. In contrast to the two moves, Samsung can be described as "should be the trend and seek," and Apple is "riding, behind." From the consumer's point of view, the Galaxy A9 High Edition with the iphone SE, a six-inch large screen, a four-inch sketch, a different user experience. Galaxy A9 High Edition "fully armed", competitive advantage outstandingOf course, Samsung's competitors in China are
The tablet computer is lightweight and portable, the touch is smooth, the notebook computer is powerful, the mouse is paired with the operation is efficient; Universal flat "This detachable notebook product has" 100% notebook +100% tablet "features, such as HP ENVY x2, easy integration of the advantages of tablets and laptops, with the Windows 8 operating system and rich applications, enough for us to work efficiently and happy leisure free switch. Graphic: WIN8 Universal tablet
. In terms of cell phone configuration, the 360-odd-cool mobile phone flagship is equipped with a 6-inch 1080P Full HD screen, Equipped with a 1.7GHz Gaotong 8,086 core processor, with 3GB memory and 16GB storage space combination, with front 8 million and rear dual 13 million megapixel dual-camera, built-in 3700mAh capacity of removable battery, support mobile and Unicom dual 4G network, support dual-SIM double,
Charm Blue Note 2(799 yuan) The charm Blue Note2 front uses a 5.5 inch capacitive touch screen, the resolution is 1920x1080 pixel FHD level, the display effect is very in place. There is also a 13 million megapixel camera on the back of the fuselage, including a dual LED dimming lamp, and its corresponding 5 million-pixel front lens. The core is built on a central frequency 1.3GHz MediaTek MT6753 eight core processor, and 2GB RAM+16GB/32GB ROM memo
configuration as well as the price of the very power of the full netcom mobile phone, the overall thickness of the machine is 8.2mm, it gives a very extreme sense to the design, and white color matching in the 618 listing let Nubia Z9 Mini and stunning a lot, pure color for not like "Panda color" Friend is really a good choice, and the machine at a price of 1499 yuan, with the Android 5.0 system and Super photo components. Nubia Z9 Mini Front adopts a 5-inch capacitive touch screen wi
Zhongxing Mighty 3 (Youth edition)Reference Price: 999 RMBRecommended reasons: Metal fuselage, fingerprint identification, cost-effective ZTE Mighty 3 Smartphone is ZTE July 29 launched a flagship metal fuselage design, photography and fingerprint identification of the thousand-yuan mobile phone, Known as the first thousand metal fingerprint mobile phone. zhongxing Martial 3 has the youth version, energy version and Extreme Edition, and the author recommended is ZTE Martial 3 Youth Edition, the
Huawei P8 Max Screen Size: 6.8 inches Reference Price: 3200 RMB Recommended reasons: Thin metal body, giant screen Huawei P8 Max is Huawei recently launched a flagship screen of the high-end giant screen mobile phones, positioning audio-visual entertainment users. Huawei P8 Max uses one metal fuselage, has the gold, silver, the gray three kind of body color, the fuselage thickness is only 6.8mm, the appearance thin atmosphere, and the highest is very in place.
-state drive, with 5 seconds of fast boot and instant wake-up function, file read and write compared to the traditional hard drive has a qualitative leap! Aside from the solid state drive built into the fuselage, Add 2.5-inch 7-mm HDD or SSD hard drives, making it easier for users to upgrade their own, and providing the possibility for more space! And with its superior 4G DDR3 memory, it has a breakthrough multimedia processing power that brings incredible speed to creation, editing, and sharing
volatile ("fadds S8, S24, S0 ");Vfp_regs_save (farrays2 );Print_array (farrays2 );Printf ("/N3: vectora [?] OP vectorb [?] -> Vectord [?] ");Vfp_regs_load (farrays );ASM volatile ("fadds S8, S16, S24 ");Vfp_regs_save (farrays2 );Print_array (farrays2 );} Running result:1: scalara op scalarb-> scalard5.000000 2.000000 3.000000 4.000000 5.000000 6.000000 7.0000009.000000 10.000000 11.000000 12.000000 13.0000
: 0c000010 Jal 40 11 10: 00000000 NOP 12 14: 00853020 add A2, A0, A1 13 18: ac260008 SW A2, 8 () 14 1c: 00000000 NOP 15 20: 90000072 lbu zero, 114 (zero) 16... 17 disassembly of section. Text: 18 19 00000040 20 40: 20a50003 addi A1, A1, 3 21 44: 0c000014 Jal 50 22 48: 03e00008 Jr Ra 23 4c: 20a50004 addi A1, A1, 4 24 25 00000050 26 50: 27bdfff8 addiu sp, SP,-8 27 54: afbe0000 SW S8, 0 (SP) 28 58: 03a0f021 move
, it is a general-purpose register for special purposes. You can use it for other purposes, but in order to use others' programs or allow others to use your programsIt must comply with this agreement, but it has nothing to do with hardware. X86 has independent push and pop commands, but MIPS does not, but this does not affect MIPS's use of stacks. When a process call occursThe caller pushes the registers used after the process is called into the stack, and the caller pushes the returned address
literals, but also classes, methods, and most of the space in the class file.running A constant pool is a JVM virtual machine that, after completing the class mount operation, loads the constant pool in class file into memory and saves it in the method area , which is what we often call a const pool, which refers to the run-time pool in the method area.Next we refer to some examples of the popular constant pools on the web, and then we explain them.1 String s1 = "Hello"; 2 String s2 = "Hello";
" + "lo"; 4 string s4 = "Hel" + new String ("Lo"); 5 String s5 = new String ("Hello"); 6 String s6 = S5.intern (); 7 String s7 = "H"; 8 String s8 = "Ello"; 9 String S9 = s7 + s8;10 System.out.println (S1 = = s2); True12 System.out.println (S1 = = S3); True13 System.out.println (S1 = = S4); False14 System.out.println (S1 = = S9); False15 System.out.println (S4 = = S5); False16 System.out.println (S1 = = S6); TrueThe Java program is comp
literals, but also classes, methods, and most of the space in the class file.running A constant pool is a JVM virtual machine that, after completing the class mount operation, loads the constant pool in class file into memory and saves it in the method area , which is what we often call a const pool, which refers to the run-time pool in the method area.Next we refer to some examples of the popular constant pools on the web, and then we explain them.1 String s1 = "Hello"; 2 String s2 = "Hello";
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