David Manning created HBASE-21126:
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Summary: Add ability for HBase Canary to ignore a configurable
number of ZooKeeper down nodes
Key: HBASE-21126
URL: https://issues.apache.org/jira/browse/HBASE-21126
Project: HBase
Issue Type: Improvement
Components: canary, Zookeeper
Affects Versions: 2.0.0, 1.0.0, 3.0.0
Reporter: David Manning
Fix For: 3.0.0, 2.0.0, 1.3.0
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.)
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