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TCP 3888

ProtocolTCP
Port3888
Labels

Synopsis

  • Apache ZooKeeper uses TCP port 3888 for leader election traffic between ZooKeeper servers in an ensemble (configured as server.X=host:2888:3888 in zoo.cfg).
  • This port appears in real deployments that bundle ZooKeeper, such as Apache Kafka (pre-KIP-500 releases), Apache HBase, Hadoop (HDFS/YARN HA), and SolrCloud clusters, where ZooKeeper peers communicate over 3888 for elections.
  • It is an internal server-to-server port (clients use 2181; follower–leader sync uses 2888; leader election uses 3888).
  • Enterprise distributions (e.g., Cloudera/Hortonworks stacks, Confluent Platform) also use 3888 internally for their ZooKeeper ensembles.

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