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Posted to dev@qpid.apache.org by "Gordon Sim (JIRA)" <qp...@incubator.apache.org> on 2009/10/17 17:50:31 UTC
[jira] Created: (QPID-2153) channel collision renders pre-existing
session unusable on client
channel collision renders pre-existing session unusable on client
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Key: QPID-2153
URL: https://issues.apache.org/jira/browse/QPID-2153
Project: Qpid
Issue Type: Bug
Components: C++ Client
Reporter: Gordon Sim
Assignee: Gordon Sim
Fix For: 0.5
There are 2^16 channels available on each connection. Each session in use
requires one of these channels to be assigned. If more than 2^16 sessions are
created and deleted, the channel allocated to new sessions 'wraps around' and
can result in a collision with that allocated to a pre-existing session
resulting in a session-busy exception. This exception renders the pre-existing
session unusable on the client side (though the broker still assumes it is
attached).
Though there is a check for in-use sessions, the channel is set on the new session regardless of that check and when that session is then destroyed (as it will be if the exception is thrown) it will request the session on that channel to be erase (on the invalid assumption that it refers to itself).
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[jira] Updated: (QPID-2153) channel collision renders pre-existing
session unusable on client
Posted by "Gordon Sim (JIRA)" <qp...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/QPID-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim updated QPID-2153:
-----------------------------
Affects Version/s: 0.5
Fix Version/s: (was: 0.5)
0.6
> channel collision renders pre-existing session unusable on client
> -----------------------------------------------------------------
>
> Key: QPID-2153
> URL: https://issues.apache.org/jira/browse/QPID-2153
> Project: Qpid
> Issue Type: Bug
> Components: C++ Client
> Affects Versions: 0.5
> Reporter: Gordon Sim
> Assignee: Gordon Sim
> Fix For: 0.6
>
>
> There are 2^16 channels available on each connection. Each session in use
> requires one of these channels to be assigned. If more than 2^16 sessions are
> created and deleted, the channel allocated to new sessions 'wraps around' and
> can result in a collision with that allocated to a pre-existing session
> resulting in a session-busy exception. This exception renders the pre-existing
> session unusable on the client side (though the broker still assumes it is
> attached).
> Though there is a check for in-use sessions, the channel is set on the new session regardless of that check and when that session is then destroyed (as it will be if the exception is thrown) it will request the session on that channel to be erase (on the invalid assumption that it refers to itself).
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[jira] Commented: (QPID-2153) channel collision renders
pre-existing session unusable on client
Posted by "Gordon Sim (JIRA)" <qp...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/QPID-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789423#action_12789423 ]
Gordon Sim commented on QPID-2153:
----------------------------------
Fixed by r828108
> channel collision renders pre-existing session unusable on client
> -----------------------------------------------------------------
>
> Key: QPID-2153
> URL: https://issues.apache.org/jira/browse/QPID-2153
> Project: Qpid
> Issue Type: Bug
> Components: C++ Client
> Affects Versions: 0.5
> Reporter: Gordon Sim
> Assignee: Gordon Sim
> Fix For: 0.6
>
>
> There are 2^16 channels available on each connection. Each session in use
> requires one of these channels to be assigned. If more than 2^16 sessions are
> created and deleted, the channel allocated to new sessions 'wraps around' and
> can result in a collision with that allocated to a pre-existing session
> resulting in a session-busy exception. This exception renders the pre-existing
> session unusable on the client side (though the broker still assumes it is
> attached).
> Though there is a check for in-use sessions, the channel is set on the new session regardless of that check and when that session is then destroyed (as it will be if the exception is thrown) it will request the session on that channel to be erase (on the invalid assumption that it refers to itself).
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[jira] Resolved: (QPID-2153) channel collision renders pre-existing
session unusable on client
Posted by "Gordon Sim (JIRA)" <qp...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/QPID-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim resolved QPID-2153.
------------------------------
Resolution: Fixed
> channel collision renders pre-existing session unusable on client
> -----------------------------------------------------------------
>
> Key: QPID-2153
> URL: https://issues.apache.org/jira/browse/QPID-2153
> Project: Qpid
> Issue Type: Bug
> Components: C++ Client
> Affects Versions: 0.5
> Reporter: Gordon Sim
> Assignee: Gordon Sim
> Fix For: 0.6
>
>
> There are 2^16 channels available on each connection. Each session in use
> requires one of these channels to be assigned. If more than 2^16 sessions are
> created and deleted, the channel allocated to new sessions 'wraps around' and
> can result in a collision with that allocated to a pre-existing session
> resulting in a session-busy exception. This exception renders the pre-existing
> session unusable on the client side (though the broker still assumes it is
> attached).
> Though there is a check for in-use sessions, the channel is set on the new session regardless of that check and when that session is then destroyed (as it will be if the exception is thrown) it will request the session on that channel to be erase (on the invalid assumption that it refers to itself).
--
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