version: 2
updates:
  - package-ecosystem: "maven"
    directory: "/"
    schedule:
      interval: "daily"
    open-pull-requests-limit: 20
    ignore:
      - dependency-name: "com.google.guava:guava"
      # pin ZooKeeper dependencies to 3.5.x
      - dependency-name: "org.apache.zookeeper"
        versions: "[3.6,)"
      # pin Jetty dependencies to 9.4.x
      - dependency-name: "org.eclipse.jetty"
        versions: "[9.5,)"
      - dependency-name: "org.apache.hadoop"
      # We can't upgrade calcite without shading their guava dependencies. 
      # We can't upgrade our own guava because we have to support Hadoop 2.
      # Even then this will involve significant effort.
      # See https://github.com/apache/druid/pull/12258
      - dependency-name: "org.apache.calcite"
      # jclouds 2.1 needs Guava 18+
      - dependency-name: "org.apache.jclouds"
        versions: "[2.1,)"