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From "Min Chen (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CLOUDSTACK-6017) NPE while creating snapshot multiple times on same Root volume with S3 as secondary storage
Date Mon, 03 Feb 2014 20:05:08 GMT

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-6017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Min Chen reassigned CLOUDSTACK-6017:
------------------------------------

    Assignee: Min Chen

> NPE while creating snapshot multiple times on same Root volume with S3 as secondary storage
> -------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-6017
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6017
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Storage Controller
>    Affects Versions: 4.3.0
>            Reporter: Min Chen
>            Assignee: Min Chen
>            Priority: Critical
>             Fix For: 4.3.0
>
>
> Steps:
> 1. Have Cs 4.3 with Xen 6.0.2 HV and NFS secondary storage
> 2. Create some VMs.
> 3. Now take  snapshot of root volume of any VM. Take snapshot of same root volume again.
> Taking multiple snapshot is throwing NPE and snapshots are left in creating state in
S3
> mysql> select store_id,state,snapshot_id,volume_id,store_role,parent_snapshot_id,install_path
from snapshot_store_ref;
> +----------+-----------+-------------+-----------+------------+--------------------+---------------------------------------------------------+
> | store_id | state     | snapshot_id | volume_id | store_role | parent_snapshot_id |
install_path                                            |
> +----------+-----------+-------------+-----------+------------+--------------------+---------------------------------------------------------+
> |        1 | Destroyed |           1 |        47 | Primary    |                  0 |
c9111f41-07a4-474b-b2eb-af6c22faea46                    |
> |        1 | Ready     |           2 |         3 | Primary    |                  0 |
d7adc16a-53b4-40d8-8f94-c83dc4e8666d                    |
> |        4 | Ready     |           2 |         3 | Image      |                  0 |
snapshots/2/3/a19ab602-f994-437b-801b-1e1ead2d38a7.vhd  |
> |        1 | Ready     |           3 |         3 | Primary    |                  2 |
899c7661-e7ce-4526-9e9f-efbdcf92e2f3                    |
> |        4 | Creating  |           3 |         3 | Image      |                  2 |
snapshots/2/3                                           |
> |        1 | Ready     |           4 |         3 | Primary    |                  3 |
a1b7c4b3-4afd-4106-b786-64e35547c2ab                    |
> |        4 | Creating  |           4 |         3 | Image      |                  2 |
snapshots/2/3                                           |
> |        1 | Ready     |           5 |        48 | Primary    |                  0 |
69238dbf-6a6d-4db2-a83f-6e346f62ba88                    |
> |        4 | Ready     |           5 |        48 | Image      |                  0 |
snapshots/2/48/244cdf97-f5be-42f1-9113-d84a14469fca.vhd |
> |        1 | Ready     |           6 |        48 | Primary    |                  5 |
05751419-aea2-48b5-879c-5f4c3920d1a4                    |
> |        4 | Creating  |           6 |        48 | Image      |                  5 |
snapshots/2/48                                          |
> +----------+-----------+-------------+-----------+------------+--------------------+---------------------------------------------------------+
> 11 rows in set (0.00 sec)
> Snippet from Ms log:
> 2014-01-29 20:56:22,118 DEBUG [c.c.a.t.Request] (Job-Executor-30:ctx-8234dd77 ctx-cc2ffe07)
Seq 5-961414397: Sending  { Cmd , MgmtId: 7494415941730, via: 5(s-45-VM), Ver: v1, Flags:
100011, [{"org.apache.cloudstack.storage.command.DeleteCommand":{"data":{"org.apache.cloudstack.storage.to.SnapshotObjectTO":{"path":"snapshots/2/48","volume":{"uuid":"431e3823-7c28-4c69-84a5-bcb6c558c395","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"c040ab5c-6f99-3d0b-9377-dcf76c5798de","id":1,"poolType":"NetworkFilesystem","host":"10.147.28.7","path":"/export/home/manasa/primaryxen","port":2049,"url":"NetworkFilesystem://10.147.28.7//export/home/manasa/primaryxen/?ROLE=Primary&STOREUUID=c040ab5c-6f99-3d0b-9377-dcf76c5798de"}},"name":"ROOT-47","size":21474836480,"path":"37eaaa92-e99b-45b8-87dc-81a4e7c5f6ae","volumeId":48,"vmName":"i-2-47-VM","accountId":2,"format":"VHD","id":48,"deviceId":0,"hypervisorType":"XenServer"},"dataStore":{"com.cloud.agent.api.to.NfsTO":{"_url":"nfs://10.147.28.7/export/home/manasa/secondaryxen","_role":"ImageCache"}},"vmName":"i-2-47-VM","name":"VM-853bc152-2721-4c80-9c4c-afff916b9468_ROOT-47_20140129152615","hypervisorType":"XenServer","id":6,"quiescevm":false,"physicalSize":0}},"wait":0}}]
}
> 2014-01-29 20:56:22,213 DEBUG [c.c.a.t.Request] (AgentManager-Handler-7:null) Seq 5-961414397:
Processing:  { Ans: , MgmtId: 7494415941730, via: 5, Ver: v1, Flags: 10, [{"com.cloud.agent.api.Answer":{"result":true,"wait":0}}]
}
> 2014-01-29 20:56:22,214 DEBUG [c.c.a.t.Request] (Job-Executor-30:ctx-8234dd77 ctx-cc2ffe07)
Seq 5-961414397: Received:  { Ans: , MgmtId: 7494415941730, via: 5, Ver: v1, Flags: 10, {
Answer } }
> 2014-01-29 20:56:22,232 DEBUG [o.a.c.s.s.SnapshotServiceImpl] (Job-Executor-30:ctx-8234dd77
ctx-cc2ffe07) Failed to update snapshot state
> java.lang.NullPointerException
>         at org.apache.cloudstack.storage.snapshot.SnapshotObject.processEvent(SnapshotObject.java:291)
>         at org.apache.cloudstack.storage.snapshot.SnapshotServiceImpl.copySnapshotAsyncCallback(SnapshotServiceImpl.java:331)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.apache.cloudstack.framework.async.AsyncCallbackDispatcher.dispatch(AsyncCallbackDispatcher.java:144)
>         at org.apache.cloudstack.framework.async.InplaceAsyncCallbackDriver.performCompletionCallback(InplaceAsyncCallbackDriver.java:26)
>         at org.apache.cloudstack.framework.async.AsyncCallbackDispatcher.complete(AsyncCallbackDispatcher.java:122)
>         at org.apache.cloudstack.storage.motion.AncientDataMotionStrategy.copyAsync(AncientDataMotionStrategy.java:440)
>         at org.apache.cloudstack.storage.motion.DataMotionServiceImpl.copyAsync(DataMotionServiceImpl.java:70)
>         at org.apache.cloudstack.storage.snapshot.SnapshotServiceImpl.backupSnapshot(SnapshotServiceImpl.java:277)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.backupSnapshot(XenserverSnapshotStrategy.java:142)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.takeSnapshot(XenserverSnapshotStrategy.java:301)
>         at com.cloud.storage.snapshot.SnapshotManagerImpl.takeSnapshot(SnapshotManagerImpl.java:945)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy160.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.storage.volume.VolumeServiceImpl.takeSnapshot(VolumeServiceImpl.java:1373)
>         at com.cloud.storage.VolumeApiServiceImpl.orchestrateTakeVolumeSnapshot(VolumeApiServiceImpl.java:1783)
>         at com.cloud.storage.VolumeApiServiceImpl.takeSnapshot(VolumeApiServiceImpl.java:1724)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy196.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd.execute(CreateSnapshotCmd.java:181)
>         at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:161)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJobInContext(ApiAsyncJobDispatcher.java:109)
>         at com.cloud.api.ApiAsyncJobDispatcher$1.run(ApiAsyncJobDispatcher.java:66)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJob(ApiAsyncJobDispatcher.java:63)
>         at org.apache.cloudstack.framework.jobs.impl.AsyncJobManagerImpl$5.runInContext(AsyncJobManagerImpl.java:509)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
>         at java.lang.Thread.run(Thread.java:679)
> 2014-01-29 20:56:22,235 DEBUG [c.c.s.s.SnapshotManagerImpl] (Job-Executor-30:ctx-8234dd77
ctx-cc2ffe07) Failed to create snapshot
> com.cloud.utils.exception.CloudRuntimeException: java.lang.NullPointerException
>         at org.apache.cloudstack.storage.snapshot.SnapshotServiceImpl.backupSnapshot(SnapshotServiceImpl.java:292)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.backupSnapshot(XenserverSnapshotStrategy.java:142)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.takeSnapshot(XenserverSnapshotStrategy.java:301)
>         at com.cloud.storage.snapshot.SnapshotManagerImpl.takeSnapshot(SnapshotManagerImpl.java:945)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy160.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.storage.volume.VolumeServiceImpl.takeSnapshot(VolumeServiceImpl.java:1373)
>         at com.cloud.storage.VolumeApiServiceImpl.orchestrateTakeVolumeSnapshot(VolumeApiServiceImpl.java:1783)
>         at com.cloud.storage.VolumeApiServiceImpl.takeSnapshot(VolumeApiServiceImpl.java:1724)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy196.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd.execute(CreateSnapshotCmd.java:181)
>         at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:161)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJobInContext(ApiAsyncJobDispatcher.java:109)
>         at com.cloud.api.ApiAsyncJobDispatcher$1.run(ApiAsyncJobDispatcher.java:66)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJob(ApiAsyncJobDispatcher.java:63)
>         at org.apache.cloudstack.framework.jobs.impl.AsyncJobManagerImpl$5.runInContext(AsyncJobManagerImpl.java:509)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
>         at java.lang.Thread.run(Thread.java:679)
> 2014-01-29 20:56:22,264 DEBUG [o.a.c.s.v.VolumeServiceImpl] (Job-Executor-30:ctx-8234dd77
ctx-cc2ffe07) Take snapshot: 48 failed
> com.cloud.utils.exception.CloudRuntimeException: Failed to create snapshot
>         at com.cloud.storage.snapshot.SnapshotManagerImpl.takeSnapshot(SnapshotManagerImpl.java:963)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy160.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.storage.volume.VolumeServiceImpl.takeSnapshot(VolumeServiceImpl.java:1373)
>         at com.cloud.storage.VolumeApiServiceImpl.orchestrateTakeVolumeSnapshot(VolumeApiServiceImpl.java:1783)
>         at com.cloud.storage.VolumeApiServiceImpl.takeSnapshot(VolumeApiServiceImpl.java:1724)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
>         at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
>         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
>         at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
>         at $Proxy196.takeSnapshot(Unknown Source)
>         at org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd.execute(CreateSnapshotCmd.java:181)
>         at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:161)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJobInContext(ApiAsyncJobDispatcher.java:109)
>         at com.cloud.api.ApiAsyncJobDispatcher$1.run(ApiAsyncJobDispatcher.java:66)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at com.cloud.api.ApiAsyncJobDispatcher.runJob(ApiAsyncJobDispatcher.java:63)
>         at org.apache.cloudstack.framework.jobs.impl.AsyncJobManagerImpl$5.runInContext(AsyncJobManagerImpl.java:509)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
>         at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
>         at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
>         at java.lang.Thread.run(Thread.java:679)
> Caused by: com.cloud.utils.exception.CloudRuntimeException: java.lang.NullPointerException
>         at org.apache.cloudstack.storage.snapshot.SnapshotServiceImpl.backupSnapshot(SnapshotServiceImpl.java:292)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.backupSnapshot(XenserverSnapshotStrategy.java:142)
>         at org.apache.cloudstack.storage.snapshot.XenserverSnapshotStrategy.takeSnapshot(XenserverSnapshotStrategy.java:301)
>         at com.cloud.storage.snapshot.SnapshotManagerImpl.takeSnapshot(SnapshotManagerImpl.java:945)
>         ... 45 more
> 2014-01-29 20:56:22,266 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (Job-Executor-30:ctx-8234dd77)
Complete async job-84, jobStatus: FAILED, resultCode: 530, result: org.apache.cloudstack.api.response.ExceptionResponse/null/{"uuidList":[],"errorcode":530,"errortext":"Failed
to create snapshot due to an internal error creating snapshot for volume 48"}
> 2014-01-29 20:56:22,292 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl] (Job-Executor-30:ctx-8234dd77)
Done executing org.apache.cloudstack.api.command.user.snapshot.CreateSnapshotCmd for job-84
>  



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