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From wid...@apache.org
Subject [04/50] [abbrv] git commit: updated refs/heads/kvm-vnc-listen to 895c51d
Date Mon, 16 Sep 2013 09:11:02 GMT
CLOUDSTACK-4636: In a scaled up setup all Vm's in a cluster were stopped and/or started after
management server restart
Issue happens as there are more than one thread processing connect for a host simultaneously.
The VM full sync. is not designed to work in this scenario and as a result user VMs may get
stopped incorrectly.
Direct agent scan task runs at regular intervals (direct.agent.scan.interval defaulted to
90 secs) and identifies hosts that needs to be processed for connect. In a normal scenario
hosts mostly get connected within that interval and there are no issues. But if due to some
reason the connect process takes more time and is not completed by the time next agent scan
runs. In this case, based on the db. state same hosts may get picked up again. And then there
will be situations where more than one thread is processing connect for the same host.
The fix is to check if there is a thread already processing connect for a host and in this
case all subsequent threads for that host will simply bail out. Also there may be a scenario
where one thread already completed processing connect but another thread already got scheduled
before that and will again repeat the same. This is also prevented by putting appropriate
checks.


Project: http://git-wip-us.apache.org/repos/asf/cloudstack/repo
Commit: http://git-wip-us.apache.org/repos/asf/cloudstack/commit/ae181afb
Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/ae181afb
Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/ae181afb

Branch: refs/heads/kvm-vnc-listen
Commit: ae181afb005bd26af5503665c5c08883759ffecf
Parents: 28af817
Author: Koushik Das <koushik@apache.org>
Authored: Tue Sep 10 17:21:36 2013 +0530
Committer: Koushik Das <koushik@apache.org>
Committed: Tue Sep 10 17:21:36 2013 +0530

----------------------------------------------------------------------
 .../cloud/agent/manager/AgentManagerImpl.java   | 24 ++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cloudstack/blob/ae181afb/engine/orchestration/src/com/cloud/agent/manager/AgentManagerImpl.java
----------------------------------------------------------------------
diff --git a/engine/orchestration/src/com/cloud/agent/manager/AgentManagerImpl.java b/engine/orchestration/src/com/cloud/agent/manager/AgentManagerImpl.java
index 811ff13..6c88f6e 100755
--- a/engine/orchestration/src/com/cloud/agent/manager/AgentManagerImpl.java
+++ b/engine/orchestration/src/com/cloud/agent/manager/AgentManagerImpl.java
@@ -1037,9 +1037,22 @@ public class AgentManagerImpl extends ManagerBase implements AgentManager,
Handl
                     s_logger.debug("Simulating start for resource " + resource.getName()
+ " id " + id);
                 }
 
-                tapLoadingAgents(id, TapAgentsAction.Add);
-                _resourceMgr.createHostAndAgent(id, resource, details, false, null, false);
-                tapLoadingAgents(id, TapAgentsAction.Del);
+                if (tapLoadingAgents(id, TapAgentsAction.Add)) {
+                    try {
+                        AgentAttache agentattache = findAttache(id);
+                        if (agentattache == null) {
+                            s_logger.debug("Creating agent for host " + id);
+                            _resourceMgr.createHostAndAgent(id, resource, details, false,
null, false);
+                            s_logger.debug("Completed creating agent for host " + id);
+                        } else {
+                            s_logger.debug("Agent already created in another thread for host
" + id + ", ignore this");
+                        }
+                    } finally {
+                        tapLoadingAgents(id, TapAgentsAction.Del);
+                    }
+                } else {
+                    s_logger.debug("Agent creation already getting processed in another thread
for host " + id + ", ignore this");
+                }
             } catch (Exception e) {
                 s_logger.warn("Unable to simulate start on resource " + id + " name " + resource.getName(),
e);
             } finally {
@@ -1290,7 +1303,10 @@ public class AgentManagerImpl extends ManagerBase implements AgentManager,
Handl
     public boolean tapLoadingAgents(Long hostId, TapAgentsAction action) {
         synchronized (_loadingAgents) {
             if (action == TapAgentsAction.Add) {
-                _loadingAgents.add(hostId);
+                if (_loadingAgents.contains(hostId))
+                    return false;
+                else
+                    _loadingAgents.add(hostId);
             } else if (action == TapAgentsAction.Del) {
                 _loadingAgents.remove(hostId);
             } else if (action == TapAgentsAction.Contains) {


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