public B maxConnections(int maxConnections) {
    if (maxConnections <= 0) throw new IllegalArgumentException("maxConnections <= 0");
    this.poolLocalSize = maxConnections;
    return (B) this;
  }
Max pooled connections per datacenter-local host. Defaults to 8
zipkin-storage/cassandra/src/main/java/zipkin2/storage/cassandra/CassandraStorageBuilder.java