Github user arshadmohammad commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/179#discussion_r101964775
--- Diff: src/java/main/org/apache/zookeeper/server/NettyServerCnxn.java ---
@@ -267,10 +267,17 @@ private boolean checkFourLetterWord(final Channel
channel,
{
// We take advantage of the limited size of the length to look
// for cmds. They are all 4-bytes which fits inside of an int
- String cmd = FourLetterCommands.getCmdMapView().get(len);
- if (cmd == null) {
+ if (!FourLetterCommands.isKnown(len)) {
return false;
}
+
+ // ZOOKEEPER-2693: don't execute 4lw if it's not enabled.
+ String cmd = FourLetterCommands.getCommandString(len);
+ if (!FourLetterCommands.isEnabled(cmd)) {
+ LOG.debug("Command {} is not executed because it is not white
listed.", cmd);
+ return true;
--- End diff --
We can create a dummy command(ErrorCommand extends
AbstractFourLetterCommand ) and execute it and return true same way as
SetTraceMaskCommand
This ErrorCommand will take care rest of the thing, sending any error
message to client and closing the connection etc.
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