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  1. HBase
  2. HBASE-21146

(2.0) Add ability for HBase Canary to ignore a configurable number of ZooKeeper down nodes

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 1.0.0, 3.0.0-alpha-1, 2.0.0
    • Fix Version/s: 2.0.4
    • Component/s: canary, Zookeeper
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
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      Adds -permittedZookeeperFailures <N>

      Makes it so Canary will keep running reporting on downed zk ensemble members rather than exit.
      Show
      Adds -permittedZookeeperFailures <N> Makes it so Canary will keep running reporting on downed zk ensemble members rather than exit.

      Description

      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

      -permittedZookeeperFailures <N>

      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.)

        Attachments

        1. zookeeperCanaryLocalTestValidation.txt
          37 kB
          Josh Elser
        2. HBASE-21146.branch-2.0.001.patch
          11 kB
          David Manning
        3. HBASE-21126.master.003.patch
          11 kB
          Josh Elser
        4. HBASE-21126.master.002.patch
          11 kB
          Josh Elser
        5. HBASE-21126.master.001.patch
          11 kB
          Josh Elser
        6. HBASE-21126.branch-1.001.patch
          11 kB
          Josh Elser

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              • Assignee:
                dmanning David Manning
                Reporter:
                dmanning David Manning
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                  Updated:
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