mysql - Generating unique primary Ids of int32 & int64 sizes -

-

i developing social web application using java , distributed nosql db(cassandra). i need generate ids new users , posts on application in sizes of 32bits , 64 bits respectively.

because of building on top of distributed platform, our problem of generating ids/keys has become more complicated. although there have come solutions zookeeper/ or twitter's snowflake have helpfully been trying alleviate pain, these solutions not seem simple use.

after looking @ these solutions top level view, feel going simple solution , mature. using mysql database way flickr's ticket servers, comes mind first preference seems easiest solution.

http://code.flickr.com/blog/2010/02/08/ticket-servers-distributed-unique-primary-keys-on-the-cheap/

i know create spof around distributed system.. still believe easiest solution days(when have less resources in terms of capital , manpower). when application grows believe switching no difficult no heavy data transferred. infancy state of application guess mysql can serve me in best , simplest manner generate ids.

major factors choice:- 

  1.   easier implementation   2.   easy switching anytime in future   3.   mature   4.   mysql may required our other needs well,

i thinking of using single mysql server , later switch 2 servers flickr's solution inorder remove spof.

can point out issues may arise later when consider switching alternate solution zookeeper or snowflake? or may downsides of proposed current approach?

thanks lot time!

i know create spof around distributed system.. still believe easiest solution days

no, easiest solution use identifiers distributed dbms provides. way avoids

  • separate server hardware mysql
  • installing, configuring, , securing operating system
  • installing, configuring, , securing dbms

and need sequentiality lot less want it.

i know create spof around distributed system.

it create multiple single points of failure. odds each piece of server hardware, except possibly disks, single points of failure. (how many power supplies going put in there? how many disk controllers? how many nics?) there legion of software single points of failure, too.


Comments

Post a Comment

Popular posts from this blog

c# - How to set Z index when using WPF DrawingContext? -

-
how set z-index drawing object when using drawingcontext.drawxxx() methods? the object drawn last have higher z index. can't change index of drawn objects. way draw in order. if using wpf (as placed tag), can use, example, canvas control. create shapes need like polyline obj = new polyline(); //... // ... set properties of obj and add them canvas uielementcollection: yourcanvasname.children.add(obj); //or yourcanvasname.children.insert(i, obj); first items of collection have higher z index. advantages in way: no need redraw on window changes, can anytime move objects , change order.
Read more

razor - Is this a bug in WebMatrix PageData? -

-
i think may have found bug in webmatrix's pagedata, not sure. concerns how pass data partial page calling page. in webmatrix documentation (tutorials, e.g. " 3 - creating consistent look ", , example code), pagedata recommended mechanism pass data between pages (e.g. content page layout page, or partial page). however have found not work other way, pass data partial page calling page. modifying or adding entries in pagedata in partial page, not seem calling page. cutting right down simplest possible example, in test page may have this: @{ pagedata["test"] = "initial entry"; } <p>before calling partial page, test value @pagedata["test"]</p> @renderpage("_testpartial.cshtml") <p>after returning calling page, test value @pagedata["test"]</p> and in _testpartial.cshtml page might have this: @{ pagedata["test"] = "modified entry"; } <p>in partial page...
Read more

visual c++ - Using relative values in array sorting ( asm ) -

-
i need sort through array , sort each individual row in array in ascending order. doesn't seem going (surprise!) keep getting hit 2 errors: a2101: cannot add 2 relocatable labels , a2026: constant expected here's sort, makes sense me, think i'm still trying implement high-lvl language techniqes assembly. there way around not being able use relative values? (the array 7 rows 9 columns, btw). mov cx, 7; cx = number of rows outer: ; outer loop walk through rows push cx mov cx, 9 mov row, cx ;rows middle: ; middle-loop walk through columns push cx sub cx, 1 ;cx = cx-1 mov column, cx ;columns inner: ;inner loop - compare , exchange column values cmp marray[row*9 + column], marray[row*9 + column+1] xchg marray[row*9 + column+1], marray[row*9 + column] ; compare , exchange values marray table inc column loop inner pop cx loop mid...
Read more