Github user aarondav commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5377#discussion_r29121561
  
    --- Diff: 
network/common/src/main/java/org/apache/spark/network/sasl/SparkSaslServer.java 
---
    @@ -75,11 +81,20 @@
       private final SecretKeyHolder secretKeyHolder;
       private SaslServer saslServer;
     
    -  public SparkSaslServer(String secretKeyId, SecretKeyHolder 
secretKeyHolder) {
    +  public SparkSaslServer(
    +      String secretKeyId,
    +      SecretKeyHolder secretKeyHolder,
    +      boolean alwaysEncrypt) {
         this.secretKeyId = secretKeyId;
         this.secretKeyHolder = secretKeyHolder;
    +
    +    String qop = alwaysEncrypt ? QOP_AUTH_CONF : String.format("%s,%s", 
QOP_AUTH_CONF, QOP_AUTH);
    --- End diff --
    
    I assume this is a comma-separated list of the supported formats, for 
negotiation? Maybe add a comment to this effect.


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