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

    https://github.com/apache/drill/pull/773#discussion_r109742969
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/BitConnectionConfig.java 
---
    @@ -46,16 +47,40 @@ protected BitConnectionConfig(BufferAllocator 
allocator, BootStrapContext contex
         super(allocator, context);
     
         final DrillConfig config = context.getConfig();
    +    final AuthenticatorProvider authProvider = getAuthProvider();
    +
         if (config.getBoolean(ExecConstants.BIT_AUTHENTICATION_ENABLED)) {
           this.authMechanismToUse = 
config.getString(ExecConstants.BIT_AUTHENTICATION_MECHANISM);
           try {
    -        getAuthProvider().getAuthenticatorFactory(authMechanismToUse);
    +        authProvider.getAuthenticatorFactory(authMechanismToUse);
           } catch (final SaslException e) {
             throw new DrillbitStartupException(String.format(
                 "'%s' mechanism not found for bit-to-bit authentication. 
Please check authentication configuration.",
                 authMechanismToUse));
           }
    -      logger.info("Configured bit-to-bit connections to require 
authentication using: {}", authMechanismToUse);
    +
    +      // Update encryption related configurations
    +      
encryptionContext.setEncryption(config.getBoolean(ExecConstants.BIT_SASL_ENCRYPTION_ENABLED));
    +
    +      int maxEncodeSize = 
config.getInt(ExecConstants.BIT_SASL_ENCRYPTION_ENCODESIZE);
    +
    +      if(maxEncodeSize > RpcConstants.MAX_WRAP_SIZE) {
    +        logger.warn("Setting bit.sasl.encryption.encodesize to maximum 
allowed value of 16MB");
    +        maxEncodeSize = RpcConstants.MAX_WRAP_SIZE;
    +      }
    +      encryptionContext.setWrappedChunkSize(maxEncodeSize);
    --- End diff --
    
    I have difficulty in understanding what these sizes mean. I could at least 
classify them as related, but how are they related? Better names maybe?
    + "maxEncodeSize", "ENCODESIZE", "WrappedChunkSize", "MAX_WRAP_SIZE"
    + "RawSendSize", "RawWrapSendSize", "MaxRawWrapSendSize", 
"WRAP_RAW_SEND_SIZE"
    
    Sometimes "max" is not necessarily a maximum e.g. `maxEncodeSize`, and 
`setRawWrapSendSize` sets MaxRawWrapSendSize.
    
    I noticed only "ENCODESIZE" is configurable through drill-override.conf. 
Are the others not configurable, at connection time, for example?


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