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From "Camille Fournier (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1108) Various bugs in zoo_add_auth in C
Date Tue, 16 Aug 2011 14:27:27 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085730#comment-13085730
] 

Camille Fournier commented on ZOOKEEPER-1108:
---------------------------------------------

Mahadev, what do you say? We would like to get this into 3.4 since it causes us a lot of grief
with the auth in the C client. I think Dheeraj's point is good, and the Java and C clients
are already divergent enough in this manner that this shouldn't be an issue.

> Various bugs in zoo_add_auth in C
> ---------------------------------
>
>                 Key: ZOOKEEPER-1108
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1108
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: c client
>    Affects Versions: 3.3.3
>            Reporter: Dheeraj Agrawal
>            Assignee: Dheeraj Agrawal
>            Priority: Blocker
>             Fix For: 3.4.0
>
>         Attachments: ZOOKEEPER-1108.patch, ZOOKEEPER-1108.patch, ZOOKEEPER-1108.patch,
ZOOKEEPER-1108.patch
>
>
> 3 issues:
> In zoo_add_auth: there is a race condition:
>    2940     // [ZOOKEEPER-800] zoo_add_auth should return ZINVALIDSTATE if
>    2941     // the connection is closed.
>    2942     if (zoo_state(zh) == 0) {
>    2943         return ZINVALIDSTATE;
>    2944     }
> when we do zookeeper_init, the state is initialized to 0 and above we check if state
= 0 then throw exception.
> There is a race condition where the doIo thread is slow and has not changed the state
to CONNECTING, then you end up returning back ZKINVALIDSTATE.
> The problem is we use 0 for CLOSED state and UNINITIALIZED state. in case of uninitialized
case it should let it go through.
> 2nd issue:
> Another Bug: in send_auth_info, the check is not correct
> while (auth->next != NULL) { //--BUG: in cases where there is only one auth in the
list, this will never send that auth, as its next will be NULL 
>    rc = send_info_packet(zh, auth); 
>    auth = auth->next; 
> }
> FIX IS:
> do { 
>   rc = send_info_packet(zh, auth); 
>   auth = auth->next; 
>  } while (auth != NULL); //this will make sure that even if there is one auth ,that will
get sent.
> 3rd issue:
>    2965     add_last_auth(&zh->auth_h, authinfo);
>    2966     zoo_unlock_auth(zh);
>    2967
>    2968     if(zh->state == ZOO_CONNECTED_STATE || zh->state == ZOO_ASSOCIATING_STATE)
>    2969         return send_last_auth_info(zh);
> if it is connected, we only send the last_auth_info, which may be different than the
one we added, as we unlocked it before sending it.

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