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Bug #417

closed

sessiond hangs when a session is stopped and other sessions are in progress

Added by Jesus Garcia over 11 years ago. Updated over 11 years ago.

Status:
Invalid
Priority:
Normal
Assignee:
-
Target version:
-
Start date:
12/19/2012
Due date:
% Done:

0%

Estimated time:

Description

When several cluster-wide sessions are active and one of them is deactivated, sessiond seems to hang.
This causes a timeout in our application (TraceP), which happens 70 seconds after the call to lttng to stop the session.
The scenario is as follows:
- 4-node cluster each with a sessiond/consumerd pair
- 4 test apps running before the sessions are created. They are never stopped
- 4 cluster-wide sessions are created with several events and allowed to run for 10 sec.
- The sessions are stopped one after the other.

A log was collected with verbose mode on one of the nodes (SC-1). The issue takes place in several of the nodes, but it is seen for the 1st time on node SC-1 at the enf of the log (the rest of the log was omitted since it was a bit large)


Files

hanging_at_session_stop.txt (2.81 MB) hanging_at_session_stop.txt Jesus Garcia, 12/19/2012 09:09 PM
Actions #1

Updated by David Goulet over 11 years ago

  • Status changed from New to Invalid

This is not a hang but a long stop command. There is possibly buffer bloating problem with the tc setup.

http://wiki.linuxwall.info/doku.php/en:ressources:dossiers:networking:traffic_control#a_word_about_bufferbloat

Closing the issue here to invalid since it does not seem to affect the core code or functionality of lttng-tools.

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