This is where ZooKeeper excels: reads are concurrent since they are served by the specific server that the client connects to. Its ideal use is for coordination, where messages are exchanged between the clients. When data could be written concurrently, ZooKeeper actually gets in the way, because it imposes a strict ordering of operations even if not strictly necessary from the perspective of the writers. As long as your communication involves shared data, ZooKeeper helps you. In particular, it should not be used for interchange of large data, such as media. The guarantee of linear writes is the reason for the fact that ZooKeeper does not perform well for write-dominant workloads. It also means, however, that you cannot have concurrent writes. This means that each write makes the server up-to-date with the master. Each time a client writes to the ensemble, a majority of nodes persist the information: these nodes include the server for the client, and obviously the master. The master is the authority for writes: in this way writes can be guaranteed to be persisted in-order, i.e., writes are linear. In particular, a master node is dynamically chosen by consensus within the ensemble if the master node fails, the role of master migrates to another node. It is robust, since the persisted data is distributed between multiple nodes (this set of nodes is called an "ensemble") and one client connects to any of them (i.e., a specific "server"), migrating if one node fails as long as a strict majority of nodes are working, the ensemble of ZooKeeper nodes is alive. You may describe ZooKeeper as a replicated synchronization service with eventual consistency. In a nutshell, ZooKeeper helps you build distributed applications.
Default value of this property is 100000, just decrease it to a very small number, e.g. Some of the system specifications are listed below:īy the way, I found this question but unfortunately there is no solution for it in that page.Ģ- If SASL settings can hinder auto-purging? (I think no)ģ- Is something gone wrong in configuration?ĮDIT: It seems that the solution is something around the snapCount property. After around 6 months of using zookeeper in develop phase, though it works fine but the size of its data directory grew up to 6 GIG! and it is still increasing.
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