No, there's probably no automatic failover. If one of your memcached servers are down, you will get an increase in cache misses. It's not a reliable datastorage with failover, it's a cache. :-)
/Henrik On Wed, Nov 26, 2008 at 10:01, Jigna Joshi <[EMAIL PROTECTED]> wrote: > > HI, > > i have some problems in clustering.. > i have 2 memcache server..server1 and server2 > i m making entry in both servers...and using apache memcache module > for authorization.. > now, if i make server1 down then it is not taking key-value pair from > server2.. > i think it is problem in mod_auth_memcookie.so file > > my entry in apache is > Auth_memCookie_Memcached_AddrPort server1:11211,server2:11211 > > if i change this entry to > Auth_memCookie_Memcached_AddrPort server2:11211,server1:11211 > then it is working fine...means 2nd parameter doesnt matter... > > please help me to solve out this... > > On Oct 7, 4:37 pm, "Josef Finsel" <[EMAIL PROTECTED]> wrote: > > Jigna, > > > > As others have said, memcached is a simple, in-memory cache. The purpose > of > > such a cache is to provide a quicker place to get data from but it should > > not be the actual repository. > > > > For example, if my application shows event dates, those dates may be > stored > > in a database, and that would be the actual repository. When someone > > requests the event dates from a web page, the web server first checks the > > cache (which is the quickest possible solution) and either delivers the > data > > from there or goes to the database, retrieves the data, puts it in cache > and > > then delivers the data. > > > > The *advantage *of putting it in cache is that the next time the web > server > > needs the data, it may be in cache, which is quicker than reading it off > > disk from the database. > > > > The *disadvantage *of the cache is that, when it isn't found in cache, > it's > > extra steps required (check cache, get data from database, store in > cache, > > deliver as opposed to just get data from database and deliver). > > > > The *first value* of the cache is that the number of times items are > found > > in cache generally outweighs the number of times something has to perform > > the additional steps of going to the database. > > > > The *second value* of the cache is that it self-manages memory by > expiring > > items out of the cache either because their expiration date has come and > > gone or because they haven't be requested of the cache as much as items > > other items. > > > > Josef > > > > -- > > To a programmer with memcached, every problem, from scalability to > > high-availability to queuing looks like a caching problem. > > > > > > > > > > > > On Tue, Oct 7, 2008 at 12:57 AM, Jigna Joshi <[EMAIL PROTECTED]> wrote: > > > > > Hi, > > > > > Thanx for d quick reply. > > > actually, in our case we want to make entry in all servers b'coz if > > > one of the memcached server is down (server which has entry) then it > > > can get value from another server.. > > > > > rightnow, if i run Set command then it makes entery in only one server > > > and if that specific server gets down, then our application fails as > > > it doest get Key from another server. > > > > > regards, > > > Jigna Joshi > > > > > On Oct 6, 9:04 pm, "Josef Finsel" <[EMAIL PROTECTED]> wrote: > > > > The standard answer is no. Clients don't support it for many reasons. > > > > > > The longer answer involves knowing why you want put a Key-Value pair > on > > > all > > > > of your memcache servers. > > > > > > On Mon, Oct 6, 2008 at 9:32 AM, Jigna Joshi <[EMAIL PROTECTED]> > wrote: > > > > > > > Hi, > > > > > I want to add Key-Value pair in all memcache server..is it > possible? > > > > > > > On Oct 6, 6:03 pm, Brian Moon <[EMAIL PROTECTED]> wrote: > > > > >http://www.socialtext.net/memcached/index.cgi?faq#how_is_memcached_re. > .. > > > > > > > > Jigna Joshi wrote: > > > > > > > Hi, > > > > > > > > > I am using memcached-1[1].2.6-win32-bin version of MemCache > server. > > > > > > > > > Now, I have 2 instances of this server on different machine. I > am > > > > > > > using memcached-2[1].1.jar to make entry in memcache server > through > > > my > > > > > > > java application. > > > > > > > > > When both servers are up, it makes entry in only one of the > server. > > > > > > > > > Is it provide any configuration to make entry of Key-value pair > in > > > all > > > > > > > memcache servers. > > > > > > > > > Waiting for your reply. > > > > > > > > > Thanking You, > > > > > > > > -- > > > > > > > > Brian Moon > > > > > > Senior Web Engineer > > > > > > ------------------------------ > > > > > > When you care enough to spend the very least. > > >http://dealnews.com/-Hide > > > > > quoted text - > > > > > > > > - Show quoted text - > > > > > > -- > > > > "If you see a whole thing - it seems that it's always beautiful. > Planets, > > > > lives... But up close a world's all dirt and rocks. And day to day, > > > life's a > > > > hard job, you get tired, you lose the pattern." > > > > Ursula K. Le Guin- Hide quoted text - > > > > > > - Show quoted text - > > > > -- > > "If you see a whole thing - it seems that it's always beautiful. Planets, > > lives... But up close a world's all dirt and rocks. And day to day, > life's a > > hard job, you get tired, you lose the pattern." > > Ursula K. Le Guin- Hide quoted text - > > > > - Show quoted text -
