Of three servers, you are tolerant to one server being lost, and writes must propagate to two servers before they areĬommitted. This means that if you choose to run an ensemble Start with a small ensemble of three or five servers and only scale as truly necessary (or as required for fault tolerance).Įach write must be propagated to a quorum of servers in the ensemble.A few general considerations for multi-node ZooKeeper ensembles: If at any time, quorum is lost, the ZooKeeper cluster will goĭown. At any given time, there can be up to n failed servers inĪn ensemble and the ZooKeeper cluster will keep quorum. The odd number of serversĪllows ZooKeeper to perform majority elections for leadership. This is called an ensemble.Īn ensemble is a set of 2n + 1 ZooKeeper servers where n is any number greater than 0. In a production environment, the ZooKeeper servers will be deployed on multiple nodes. Set to a positive integer (1 and above) to enable the auto purging. The time interval in hours for which the purge task has to be triggered. When enabled, ZooKeeper auto purge feature retains the autopurge.snapRetainCount most recent snapshots and theĬorresponding transaction logs in the dataDir and dataLogDir respectively and deletes the rest. To avoid running out of allowed connections The maximum allowed number of client connections for a ZooKeeper server. Note that the minimum session timeout will be two ticks. It is used for heartbeats and timeouts especially. This governs all ZooKeeper time dependent operations. The unit of time for ZooKeeper translated to milliseconds. If you don’t specify this option, the log is written to dataDir.īy specifying this option, you can use a dedicated log device, and help avoid competition between logging and snapshots.įor more information, see the ZooKeeper Administration Guide. The location where the transaction log is written to. This location should be a dedicated disk that is ideally an SSD. The directory where ZooKeeper in-memory database snapshots and, unless specified in dataLogDir, the transaction log of This is where the Brokers will connect to ZooKeeper. This is the port where ZooKeeper clients will listen on. Below are a few important parameters to consider.Ī complete list of configurations can be found in the ZooKeeper project page. ZooKeeper does not require configuration tuning for most deployments. The ZooKeeper configuration properties file is located in /etc/kafka/zookeeper.properties.
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