CODEWITHSUNDEEP
configurationapache-zookeeper
JSR29
JSR29

Reputation: 354

Task scheduling in Zookeeper

I am trying Zookeeper for storing the configs for services, so one functionality I need is scheduling, i.e. for some mentioned duration I will swap my current config, with some other config. How can I achieve this in Zookeeper?

Also what is the best UI for the zookeeper?

Upvotes: 1

Views: 578

Answers (1)

Miljen Mikic
Miljen Mikic

Reputation: 15261

Q: I am trying Zookeeper for storing the configs for services, so one functionality I need is scheduling, i.e. for some mentioned duration I will swap my current config, with some other config. How can I achieve this in Zookeeper?

Let's assume that you have two applications, one that sets configuration (let's call it A) and the other that reads it (let's call it B). A should create znode in ZooKeeper, named for example /config, with the configuration data inside. Note that a single znode can keep up to 1 MB of data - that should be probably enough for keeping the configuration. B then needs to read the content of znode /config and register a watch. The purpose of watch is to notify B whenever something changes with that znode.

Particularly, when A writes new configuration into /config, watch will ensure that B gets a notification about it. Important note - watch event is one-time trigger, i.e. when B gets notification, it needs to register a watch again or it will miss further changes. Also note that ZooKeeper itself does not have any built-in scheduler mechanism - A will have to rely on its system clock to update the configuration within the specified time frame.

Q: Also what is the best UI for the zookeeper?

Haven't personally tried any of these (zkCli fits my needs), but supposedly the most popular are:

Upvotes: 1

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