Josh Elser created HBASE-21146: ---------------------------------- Summary: (2.0) Add ability for HBase Canary to ignore a configurable number of ZooKeeper down nodes Key: HBASE-21146 URL: https://issues.apache.org/jira/browse/HBASE-21146 Project: HBase Issue Type: Improvement Components: canary, Zookeeper Affects Versions: 1.0.0, 3.0.0, 2.0.0 Reporter: David Manning Assignee: David Manning Fix For: 3.0.0, 1.5.0, 2.2.0 Attachments: HBASE-21126.branch-1.001.patch, HBASE-21126.master.001.patch, HBASE-21126.master.002.patch, HBASE-21126.master.003.patch, zookeeperCanaryLocalTestValidation.txt
When running org.apache.hadoop.hbase.tool.Canary with args -zookeeper -treatFailureAsError, the Canary will try to get a znode from each ZooKeeper server in the ensemble. If any server is unavailable or unresponsive, the canary will exit with a failure code. If we use the Canary to gauge server health, and alert accordingly, this can be too strict. For example, in a 5-node ZooKeeper cluster, having one node down is safe and expected in rolling upgrades/patches. This is a request to allow the Canary to take another parameter {code:java} -permittedZookeeperFailures <N>{code} If N=1, in the 5-node ZooKeeper ensemble example, then the Canary will still pass if 4 ZooKeeper nodes are reachable, but fail if 3 or fewer are reachable. (This is my first Jira posting... sorry if I messed anything up.) -- This message was sent by Atlassian JIRA (v7.6.3#76005)