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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2901) Session ID that is negative causes mis-calculation of Ephemeral Type
Date Thu, 21 Sep 2017 13:58:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174792#comment-16174792
] 

Jordan Zimmerman commented on ZOOKEEPER-2901:
---------------------------------------------

[~mjohnson207] - I think that can work. The hard part is deciding what to do about existing
sessions when the new server loads. I think the only choice is to somehow invalidate those
sessions. We need to do this because of this code in LeaderSessionTracker.java - which I don't
understand TBH

{code}
        /*
         * if local session is not enabled or it used to be our local session
         * throw sessions expires
         */
        if (!localSessionsEnabled
                || (getServerIdFromSessionId(sessionId) == serverId)) {
            throw new SessionExpiredException();
        }
{code}

> Session ID that is negative causes mis-calculation of Ephemeral Type
> --------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2901
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2901
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.3
>         Environment: Running 3.5.3-beta in Docker container
>            Reporter: Mark Johnson
>            Assignee: Jordan Zimmerman
>            Priority: Blocker
>
> In the code that determines the EphemeralType it is looking at the owner (which is the
client ID or connection ID):
> EphemeralType.java:
>    public static EphemeralType get(long ephemeralOwner) {
>        if (ephemeralOwner == CONTAINER_EPHEMERAL_OWNER) {
>            return CONTAINER;
>        }
>        if (ephemeralOwner < 0) {
>            return TTL;
>        }
>        return (ephemeralOwner == 0) ? VOID : NORMAL;
>    }
> However my connection ID is:
> header.getClientId(): -720548323429908480
> This causes the code to think this is a TTL Ephemeral node instead of a
> NORMAL Ephemeral node.
> This also explains why this is random - if my client ID is non-negative
> then the node gets added correctly.



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