Add, delete, and delete nodes in Hadoop. 1. Modify host as normal datanode. Add namenode ip2. modify namenode configuration file confslaves add ip or host3. on the machine of the new node, start the service [root @ slave-004hadoop] #. binhadoop-daemon.shstartdatanode [root @ slav
Add, delete, and delete nodes in Hadoop. 1. Modify host as normal datanode. Add the ip address of namenode 2. modify the configuration file conf/slaves of namenode to add the ip address or host of the new node. 3. on th
year month day {0: c} currency style by format C currency {0: c} $1.42-$12,400 D decimal {0: d} system. formatexception-12400 e scientific {0: e} 1.420000e + 000-1.2420.e + 004 F fixed point {0: f} 1.42-12400.00g General {0: g} 1.42-12400 N number with commas for thousands {0: n} 1.42-12,400 r round trippable {0: R} 1.42 system. formatexception x hexadecimal {0: X4} system. formatexception cf90
The {0: d} date only displays the year, month, and day.
prompt are displayed, the application have finished allocating all The memory and we can take a look at the managed heap using the dumpheap–stat command: 0:004> ! Dumpheap-stat Total 22812 objectsstatistics:mt Count totalsize Class Name79119954 1 System.Security.Permissions.ReflectionPermission79119834 1 System.Security.Permissions.FileDialogPe Rmission791197b0 1 System.Security.PolicyManager ..... 791032a8 2 System.Globalization.NumberFor
0: 004>! Threads**************************************** ****************************** Symbols can not be loaded because symbol path is not initialized .**** The symbol path can be set :** Using the _ nt_symbol_path environment variable .** Using the-Y * Using. sympath and. sympath + ***************************************** *****************************PDB symbol for CLR. dll not loadedThreadcount: 2Unstartedthread: 0Backgroundthread: 1Pendingthread
)! Dumparray // view the array informationNext let's take a look at the specific debugging steps:1. Our test codeNamespace testclass{Class Program{[Stathread]Static void main (string [] ARGs){Arraylist list = new arraylist ();List. Add ("aaaa ");List. Add ("BBBB ");Console. Readline ();}}} It is very simple. It is an arraylist.Run this program (start execution, do not Debug), then enter windbg, attach to this process2. View All stack information0: 004
relationship of an instance! Dumpobj (DO) 012a3904 // display the specific content of an object to see what is in the object and what is the value! Objsize 012a1ba4 // actual size of the object in the memory! Eeheap-GC // view the managed heap (including the size)! Dumparray // view the array information
Next let's take a look at the specific debugging steps:1. Our test codeNamespace testclass
{
Class Program
{
[Stathread]
Static void main (string [] ARGs)
{
Arraylist list = new arraylist ();
L
Assume that there is a data table named "people". Its column structure and data content are as follows:
ID (column type varchar)
Name (column type varchar)
Salary (column type INT)
001
Wang Xiaoming
30000
002
Chen Yongnian
35000
003
Wang xinguo
28000
A connection con has been created.
1. Use SQL syntax to add and modify and delete data
1. Add a new item Add a new number 004, name Liu S
directly allocated with virtualalloc -- It doesn't go through a regular windows heap. and same for the so-called "loader heaps" which hold typeInformation and jitted code. most of the conventional "Heap" allocations are from whatever unmanaged is running. in this case it's a winform application with piles of controls so there's storage associated with those things.
There isn't much "other data" here so the heap situation is probably pretty good but let's see where we stand on detailed CLR memor
#004: [email protected] () + 0xf bytes#003: Myproj.exe!wwinmain (hinstance__ * hinstance=0x00400000, hinstance__ * hprevinstance=0x00000000, wchar_t * LPCMDLINE=0X000208E0, #000: int ncmdshow=0x00000001) line + 0xc bytes C + +#002: Myproj.exe!__tmaincrtstartup () line 589 + 0x35 bytes C#001: Myproj.exe!wwinmaincrtstartup () line 414 C#000: [email protected] () + 0x23 bytes#000 ~ #003 is the same as the first step, no longer explained. In #
A dictionary is another mutable container model and can store any type of object.each key value of the dictionary (key=>value) pairs with a colon (:), each pair is separated by a comma (,), the entire dictionary is included in curly braces ({})Medium:DIC = {key1:value1, key2:value2}The key must be unique, but the value does not have to be unique, and the value can take any data type, but the key must be immutable, such as a string, a number, or a tuple. ExId_name = {001:eric,002:lz,003:sky}Take
Example 4:
Use the list component to make a MP3 playlist.
Create a new XML document, enter the following code in Notepad, and save it as Xml-004.xml.
Copy Code code as follows:
XML Structure:
Open Flash Create a new flash document, size 200*150, saved to the directory of the XML document just now, named Xml-04.fla. New 2 layers Name the actions, Cont, and the Cont layer to pull a list component to the first frame. The size is 200*150,
on Test data for this row. Mysql> select * from test;+-------+| name2 |+-------+| 001 || 002 || 003 |+-------+3 Rows in Set (0.00 sec)mysql> Delete from test where name2= ' 001 ';Query OK, 1 row affected (0.02 sec)Mysql> select * from test;+-------+| name2 |+-------+| 002 || 003 |+-------+2 rows in Set (0.00 sec)Delete and then insert the new data.mysql> INSERT INTO Test (name2) VALUES (' 004 ');Query OK, 1 row affected (0.02 sec)Mysql> select * from
terminals logged in, if we log in 10 back, Exit 3, the final result is 10 back.
Monitoring interrupts#sar -I ALL 103:47:59 PM INTR intr/s03:48:00 PM 0 0.0003:48:00 PM 1 0.0003:48:00 PM 2 0.0003:48:00 PM 3 0.0003:48:00 PM 4 0.0003:48:00 PM 5 0.0003:48:00 PM 6 0.0003:48:00 PM 7 0.00Description(1) INTR indicates the interrupt number, the meaning of the interrupt number can be/proc/int
key or unique index conflicts, it performs the update operation on the conflicting row to update the specified columns in the SQL statement. If no columns conflict, this syntax works the same as the simple insert into syntax. For example: 01 mysql> insert into t (id, c1, c2) values (, 30), (, 70) on duplicate key update c1 = values (c1 ), c2 = values (c2); 02 Query OK, 4 rows affected (0.00 sec) 03 Records: 2 Duplicates: 2 Warnings: 004 05 mysql> sel
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