Github user arina-ielchiieva commented on a diff in the pull request: https://github.com/apache/drill/pull/445#discussion_r58358260 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/service/ServiceEngine.java --- @@ -177,6 +182,18 @@ public void run() { }); } + /** If we are in distributed mode, disallow using loopback address to register new drillbit + * unless zookeeper is on the same node with drillbit. */ + private void checkLoopbackAddress(String address) throws DrillbitStartupException, UnknownHostException { + if (isDistributedMode) { + String coordAddress = StringUtils.substringBefore(config.getString(ExecConstants.ZK_CONNECTION), ":"); + if (!InetAddress.getByName(coordAddress).isLoopbackAddress() --- End diff -- At some point, we wanted to allow loopback only if we have one node only but it's much safer to disallow loopback in distributed mode at all. Updated pull request.
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