Redis is an in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker, with optional durability.
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ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. At PostHog we use it to store metadata information for ClickHouse and Kafka . Failure modes Disk space usage increases rapidly It has been observed that Zookeepers can suddenly increase it's disk usage, after being in a stable state for some time. This can sometimes be resolved by ensuring that old Zookeeper snapshots are cleared. If…Read next article