Description of problem: In installations with lots of grid components, the qpid-stat command will sometimes take multiple minutes to return a result. Version-Release number of selected component (if applicable): 1.1.1 How reproducible: Unknown... It happened at least once
It is suspected that this is caused by one or more unresponsive qmf agents in the network. qpid-stat doesn't limit its queries to just the broker-resident agents and can get stuck waiting for timeouts to expire on unresponsive agents.
A fix for this problem has been committed upstream at revision 773089. This fix restricts the qpid-stat queries to talk only to the agents embedded within the messaging broker.
qpid-tools-0.7.946106-10.el5 This may be a new bug, but I experienced it while testing if it does not take very long time. And it did, even exited with error once: $ qpid-stat -u broker.on.the.other.side.of.globe Failed: IndexError - list index out of range Traceback (most recent call last): File "/usr/bin/qpid-stat", line 528, in ? bm.display() File "/usr/bin/qpid-stat", line 466, in display self.displayMain(_types[0], _types[1:]) File "/usr/bin/qpid-stat", line 445, in displayMain elif main == 'u': self.displaySubscriptions(subs) File "/usr/bin/qpid-stat", line 418, in displaySubscriptions row.append(self.qmf.getObjects(_objectId=s.queueRef)[0].name) IndexError: list index out of range The other time (when I was already measuring time), I got: $ time qpid-stat -u the.same.server.far.away ... qmfagent qmfagent-baee9190-7818-4a2f-957d-4a909af1632c 10.16.44.247:39866 condor_startd 19189 Y CREDIT 421 ... real 74m30.613s user 11m41.054s sys 0m30.637s And that's pretty SLOW! The other options (-b, -c, -e, -q) do not take so long and with a correct result. The "show subscription" operation is generally slower also when run against local broker (though it does not end with error there). See following: $ time qpid-stat -b localhost real 0m2.838s user 0m0.264s sys 0m0.021s $ time qpid-stat -c localhost real 0m2.810s user 0m0.246s sys 0m0.023s $ time qpid-stat -e localhost real 0m2.816s user 0m0.241s sys 0m0.023s $ time qpid-stat -q localhost real 0m2.876s user 0m0.252s sys 0m0.023s $ time qpid-stat -u localhost real 0m9.732s user 0m0.562s sys 0m0.025s
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Previously, the qpid-stat command sometimes took several minutes to return a result due to one or more unresponsive qmf agents in the network in installations with various grid components Queries because qpid-stat didn't limit its queries to just the broker-resident. With this update, qpid-stat queries are restricted to the agents in the messaging broker.
Technical note updated. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. Diffed Contents: @@ -1 +1 @@ -Previously, the qpid-stat command sometimes took several minutes to return a result due to one or more unresponsive qmf agents in the network in installations with various grid components Queries because qpid-stat didn't limit its queries to just the broker-resident. With this update, qpid-stat queries are restricted to the agents in the messaging broker.+Previously, the 'qpid-stat' command sometimes took several minutes to return a result due to one or more unresponsive QMF agents in the network in installations with various grid component queries because qpid-stat did not limit its queries to just the broker-resident. With this update, qpid-stat queries are restricted to the agents in the messaging broker.
This issue has been fixed as of the 0.18 upstream release. The interchange between qpid-stat and the broker was completely re-engineered and is significantly faster.
Tested on RHEL5.9 and RHEL6.4 (both i386 and x86_64). The latest available qpid-stat version (MRG/M 2.3) is capable of getting information from a broker 15-20 times faster than the previous release. Packages used for testing: qpid-tools-0.18-8.el5 qpid-tools-0.18-8.el6 -> VERIFIED