All About Zookeeper (And ClickHouse Keeper, too!)
Presentation slides from webinar hosted on March 30, 2022.
All About Zookeeper (And ClickHouse Keeper, too!)
ClickHouse clusters depend on ZooKeeper to handle replication and distributed DDL commands. In this webinar, we’ll explain why ZooKeeper is necessary, how it works, and introduce the new built-in replacement.
How to Set Up a ClickHouse Cluster with Zookeeper
One of the first when working with ClickHouse is “How do I set up my own ClickHouse cluster™?” This guide is the answer.
CVE-2021-44228 Log4J Vulnerability and ClickHouse
ClickHouse and Altinity products are not subject to CVE-2021-44228 based on knowledge available today. If you run any Java applications, you should check whether they have the affected Log4J library version. Check here for advice to detect and remediate the problem.
SigNoz and ClickHouse Zookeeper Replacement — August SF Bay Area Meetup
The August 2021 ClickHouse SF Bay Area meetup featured two excellent talks on our favorite database. SigNoz and Yandex explored observability and Zookeeper replacement followed by many questions. Eliminating Zookeeper is a long-awaited improvement, and the talk is the first time it has been publicly presented. Check out event replays and details here.
A New Way to Restore ClickHouse After ZooKeeper Metadata Is Lost
Every ClickHouse user has experienced data loss due to user error or operational failure with Zookeeper at least once in their lifetime. If a failure resulted in metadata loss, ClickHouse tables can turn into pumpkins–you can query but you cannot insert more data. But as of ClickHouse version 21.7, this has changed with a new SQL Command. Keep reading to learn more.