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The company creates a replica in each country, or perhaps a replica for several adjacent countries Users access the server that is geographically closest and enjoy high bandwidth and little contention A company may want to make some of its directory data available to partners outside the company rewall It creates a replica that is accessible to the partners and con gures the replication to copy only certain attributes of each entry, or only certain entries, to the replica A replica may be maintained as a hot standby If the main server goes down, clients can be redirected to use the replica instead When a change is made to data in one server, the change may be propagated immediately to the other one, or the servers may be con gured to propagate changes at regular intervals for example, once an hour The servers may be con gured to do all the replication at night Eventually, all the servers involved in replication will contain identical data (if replication was con gured to keep the entire contents in synch) At any given moment, however, that may not be the case Why do we, as developers of client applications for directories, care We should never assume that all clients of all servers in a replicated environment have the same view of the directory at all times In particular, we cannot assume that a change made by a program to data in one server will be visible to all users immediately If replication is con gured to happen only once a day, it may be many hours before the change has propagated to all servers; in the meantime, other changes may have been introduced that negate the original change One particularly common programming paradigm simply does not work in many replicated scenarios: writing data to the server and then reading it back to verify that it was successfully stored Often, a replica is con gured to be read-only The vast majority of LDAP operations are searches or reads, and the replica responds to the search and read requests just as if it were an independent directory and not a copy But when it receives a write request, it returns a referral pointing to the master (or source) directory instead of returning search results Referrals are discussed in detail in 16 When the client receives the referral, it contacts the referred-to server and presents the write request there That work may be done transparently by the SDK, such that the user or application is not aware that she or it is talking to more than one server If the application then attempts to read from the server to verify the data, the request will be ful lled by the replica But the replica has most likely not yet been noti ed of the change in the data of the master, so the client may draw the conclusion that the write failed How can you keep your application functioning sanely when updates are being referred to a server that is different from the one to which the program originally con-. asp.net qr code reader QR Code Scanner in ASP.Net - CodeProject
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After getting that file from your ASP.NET server code, you can try decoding it by using a software-based barcode reader suporting QR Code like ... nected The rst rule is to cache the changes in the client rather than reading an entry immediately after writing it (if the write succeeded) If relying on a cached copy is not possible (that is, if your application must immediately verify that a write succeeded by reading the same data), then you will have to make sure that the application connects to the master server and not to a read-only replica You may even want to turn off automatic referral following during updates and have the SDK throw an exception if referrals are received instead, so that you can notify the user that the application needs to be recon gured to point to the master server Once the IETF has adopted standards for multimaster replication, there will be an increasing number of LDAP servers con gured so that more than one server may contain writable copies of the same data In a multimaster environment, changes may be made to the same entry at the same time on different servers Depending on how the servers resolve the differences when they compare the changes (and perhaps on whether or not the system clocks of the servers are perfectly synchronized), the change made on one server may erase the change made on another server, or the end result may be a combination of both changes In either case, the client making a change to directory data cannot assume that the change will appear the same to other users or even to itself later even if the client has sole access to one server In directory or database terms, this paradigm is called loose consistency Eventually all servers will converge on a single view of the data, but at any given point in time they may differ asp.net qr code reader Read QR Code Using ASP.NET Barcode Reader - BarcodeLib.com
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