Zookeeper knows okay three AS are online and these servers now ask for the ranges In the memory of ZK we have the range. As soon as added to the system, they will contact the zookeeper and register themselves in the zookeeper. How do and from where do these servers get to know from where to begin the count and when they will get out of count. In this system, we have added these servers recently. Let’s understand how these app servers get counter reaches?Ĭonsider each and every app server that has a counter running in it.
#TINYURL CREATOR HOW TO#
The only issue we were facing is how to maintain the counter, from where to start the count in case a service goes down.
We have already seen how to resolve the collision problem. Technique 3: use counter, it’s thread-safe.
What if the long URL is different? we need to change the input and generate the mapping and if not present insert it into the DB. The good thing is there’s always a mapping present in the DB i.e if two users are trying to access the same long URL ‘A’, chances are there that particular mapping is present in the DB and hence no need to insert. Again there are chances of collision in the DB. From the hash code, we use only 7 char and insert them into the DB. what happens here if we give the same long URL it always gives the same hash code (consists of caps, small letters, and numbers) i.e same short URL.
#TINYURL CREATOR GENERATOR#
Now our shorl URL generator is based on M5. Technique 2: Let’s use MD5 to resolve these issues. In RDBMS, we have DB level function like put if not exists which avoid such kind of corruption. One way to resolve that is to have a unique id constraint on a short URL and this way whoever trying to insert last will need to rework their mapping. Both the app server checks if the same short URL exists in DB or not and both of them insert mapping into the table. However both of them got the same random number, as a result, generate same 7 char short URL, i.e we have same short URL for different long URL. What if you have two different app servers and at one point in time they convert long URL A and long URL B to a short URL.
0 kommentar(er)
