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From bhais...@apache.org
Subject git commit: updated refs/heads/CLOUDSTACK-8530 to 43a0b6b
Date Mon, 01 Jun 2015 12:58:07 GMT
Repository: cloudstack
Updated Branches:
  refs/heads/CLOUDSTACK-8530 [created] 43a0b6bb0


CLOUDSTACK-8530: KVM hosts without active agents should be in Disconnected state

KVM hosts which are actuall up, but if their agents are shutdown should be put
in disconnected state. This would avoid getting the VMs HA'd and other commands
such as deploying a VM will exclude that host and save us from errors.

The improvement is that, we first try to contact the KVM host itself. If it fails
we assume that it's disconnected, and then ask its KVM neighbours if they can
check its status. If all of the KVM neighbours tell us that it's Down and we're
unable to reach the KVM host, then the host is possibly down. In case any of the
KVM neighbours tell us that it's Up but we're unable to reach the KVM host then
we can be sure that the agent is offline but the host is running.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>


Project: http://git-wip-us.apache.org/repos/asf/cloudstack/repo
Commit: http://git-wip-us.apache.org/repos/asf/cloudstack/commit/43a0b6bb
Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/43a0b6bb
Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/43a0b6bb

Branch: refs/heads/CLOUDSTACK-8530
Commit: 43a0b6bb064f607196bdf84819e1b472e4a705fb
Parents: 19cc5eb
Author: Rohit Yadav <rohit.yadav@shapeblue.com>
Authored: Mon Jun 1 14:53:58 2015 +0200
Committer: Rohit Yadav <rohit.yadav@shapeblue.com>
Committed: Mon Jun 1 14:53:58 2015 +0200

----------------------------------------------------------------------
 .../kvm/src/com/cloud/ha/KVMInvestigator.java   | 43 +++++++++++++++-----
 1 file changed, 33 insertions(+), 10 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cloudstack/blob/43a0b6bb/plugins/hypervisors/kvm/src/com/cloud/ha/KVMInvestigator.java
----------------------------------------------------------------------
diff --git a/plugins/hypervisors/kvm/src/com/cloud/ha/KVMInvestigator.java b/plugins/hypervisors/kvm/src/com/cloud/ha/KVMInvestigator.java
index e750ced..b816d09 100644
--- a/plugins/hypervisors/kvm/src/com/cloud/ha/KVMInvestigator.java
+++ b/plugins/hypervisors/kvm/src/com/cloud/ha/KVMInvestigator.java
@@ -18,13 +18,6 @@
  */
 package com.cloud.ha;
 
-import java.util.List;
-
-import javax.ejb.Local;
-import javax.inject.Inject;
-
-import org.apache.log4j.Logger;
-
 import com.cloud.agent.AgentManager;
 import com.cloud.agent.api.Answer;
 import com.cloud.agent.api.CheckOnHostCommand;
@@ -35,6 +28,11 @@ import com.cloud.host.dao.HostDao;
 import com.cloud.hypervisor.Hypervisor;
 import com.cloud.resource.ResourceManager;
 import com.cloud.utils.component.AdapterBase;
+import org.apache.log4j.Logger;
+
+import javax.ejb.Local;
+import javax.inject.Inject;
+import java.util.List;
 
 @Local(value = Investigator.class)
 public class KVMInvestigator extends AdapterBase implements Investigator {
@@ -60,22 +58,47 @@ public class KVMInvestigator extends AdapterBase implements Investigator
{
         if (agent.getHypervisorType() != Hypervisor.HypervisorType.KVM && agent.getHypervisorType()
!= Hypervisor.HypervisorType.LXC) {
             return null;
         }
+        Status hostStatus = null;
+        Status neighbourStatus = null;
         CheckOnHostCommand cmd = new CheckOnHostCommand(agent);
+
+        try {
+            Answer answer = _agentMgr.easySend(agent.getId(), cmd);
+            if (answer != null) {
+                hostStatus = answer.getResult() ? Status.Down : Status.Up;
+            }
+        } catch (Exception e) {
+            s_logger.debug("Failed to send command to host: " + agent.getId());
+        }
+        if (hostStatus == null) {
+            hostStatus = Status.Disconnected;
+        }
+
         List<HostVO> neighbors = _resourceMgr.listHostsInClusterByStatus(agent.getClusterId(),
Status.Up);
         for (HostVO neighbor : neighbors) {
             if (neighbor.getId() == agent.getId() || (neighbor.getHypervisorType() != Hypervisor.HypervisorType.KVM
&& neighbor.getHypervisorType() != Hypervisor.HypervisorType.LXC)) {
                 continue;
             }
+            s_logger.debug("Investigating host:" + agent.getId() + " via neighbouring host:"
+ neighbor.getId());
             try {
                 Answer answer = _agentMgr.easySend(neighbor.getId(), cmd);
                 if (answer != null) {
-                    return answer.getResult() ? Status.Down : Status.Up;
+                    neighbourStatus = answer.getResult() ? Status.Down : Status.Up;
+                    s_logger.debug("Neighbouring host:" + neighbor.getId() + " returned status:"
+ neighbourStatus + " for the investigated host:" + agent.getId());
+                    if (neighbourStatus == Status.Up) {
+                        break;
+                    }
                 }
             } catch (Exception e) {
                 s_logger.debug("Failed to send command to host: " + neighbor.getId());
             }
         }
-
-        return null;
+        if (neighbourStatus == Status.Up && (hostStatus == Status.Disconnected ||
hostStatus == Status.Down)) {
+            hostStatus = Status.Disconnected;
+        }
+        if (neighbourStatus == Status.Down && (hostStatus == Status.Disconnected
|| hostStatus == Status.Down)) {
+            hostStatus = Status.Down;
+        }
+        return hostStatus;
     }
 }


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