With three servers, if you perform maintenance on one of them, you are vulnerable to a failure on one of the other two servers during that maintenance.
ZOOKEEPER AUTOPURGE INTERVAL INSTALL
Usually three servers is more than enough for a production install, but for maximum reliability during maintenance, you may wish to install five servers. NoteĪs mentioned in the ZooKeeper Getting Started Guide, a minimum of three servers are required for a fault tolerant clustered setup, and it is strongly recommended that you have an odd number of servers. However, with five machines ZooKeeper can handle the failure of two machines. For example, with four machines ZooKeeper can only handle the failure of a single machine if two machines fail, the remaining two machines do not constitute a majority. Because Zookeeper requires a majority, it is best to use an odd number of machines. As long as a majority of the ensemble are up, the service will be available. At Yahoo!, ZooKeeper is usually deployed on dedicated RHEL boxes, with dual-core processors, 2GB of RAM, and 80GB IDE hard drives.įor reliable ZooKeeper service, you should deploy ZooKeeper in a cluster known as an ensemble. Three ZooKeeper servers is the minimum recommended size for an ensemble, and we also recommend that they run on separate machines. It runs as an ensemble of ZooKeeper servers. ZooKeeper runs in Java, release 1.7 or greater (JDK 7 or greater, FreeBSD support requires openjdk7).
ZOOKEEPER AUTOPURGE INTERVAL FULL
The ZooKeeper community will fix obvious bugs that are reported for other platforms, but there is no full support. Support Matrix Operating Systemįor any operating system not explicitly mentioned as supported in the matrix, components may or may not work. The following matrix describes the level of support committed for running each component on different operating system platforms. Contrib refers to multiple optional add-on components.Native Client is a client implemented in C, similar to the Java client, used by applications to connect to a ZooKeeper ensemble.Server is the Java server that runs on the ZooKeeper ensemble nodes.Client is the Java client library, used by applications to connect to a ZooKeeper ensemble.Some components are supported broadly, and other components are supported only on a smaller set of platforms. ZooKeeper consists of multiple components. The final section covers situations in which you are setting up ZooKeeper on a limited basis - for evaluation, testing, or development - but not in a production environment. The first two sections assume you are interested in installing ZooKeeper in a production environment such as a datacenter. This section contains information about deploying Zookeeper and covers these topics: Upgrading existing non-TLS cluster with no downtime.Communication using the Netty framework.Encryption, Authentication, Authorization Options.Things to Consider: ZooKeeper Strengths and Limitations.ZooKeeper Administrator's Guide A Guide to Deployment and Administration
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