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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9421) Add full length to SASL response to allow non-blocking readers
Date Wed, 24 Apr 2013 16:53:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640642#comment-13640642

Luke Lu commented on HADOOP-9421:

bq. Using sasl-next, Nominal case with token O(1). 

Only if there is only one kind of tokens, which will not be true.

bq. In both cases, it's likely to be O(2). 

As I mentioned before, client can cache the server mechanism/protocol/name, so the smarter
client can always be amortized O(1). There will be more tokens, especially if we add capability
based tokens, sasl-next will degrade linearly.

bq. Benoy: An alternative approach in choosing a mechanism is to model after the SSL protocol.
Here Client does "ClientHello" to server with a list of mechanisms it supports.

This is a generalization of the client initiation mechanism. If we implement my proposal,
this can be added later in a _backward_ _compatible_ manner, as we can send the client capabilities
in an optional field.

In terms of complexity. Sasl-next proposal actually seems more complex by intertwine sasl
handshakes with mechanism/protocol selection/negotiation. An advantage of client initiation
is that mechanism selection/negotiation and the actual sasl process can be cleanly decoupled:

For example: the client can be as simple as:
sendRpc(header, chosenMech);
res = readRpc();
if (mechSupported(res)) {
  return finishSasl(res);
} else {
  return finishSasl(chooseMech(res));

> Add full length to SASL response to allow non-blocking readers
> --------------------------------------------------------------
>                 Key: HADOOP-9421
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9421
>             Project: Hadoop Common
>          Issue Type: Sub-task
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sanjay Radia
>            Assignee: Junping Du
>         Attachments: HADOOP-9421.patch

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