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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-9586) When using local storage with Xenserver prepareTemplate does not work with multiple primary store
Date Mon, 05 Dec 2016 10:05:59 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15721832#comment-15721832
] 

ASF subversion and git services commented on CLOUDSTACK-9586:
-------------------------------------------------------------

Commit 20aea27dc0dd2a212acd830d47945ea5ea579f0c in cloudstack's branch refs/heads/4.8 from
[~rohit.yadav@shapeblue.com]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=20aea27 ]

Merge pull request #1765 from shapeblue/CLOUDSTACK-9586

Cloudstack 9586: When using local storage with Xenserver prepareTemplate does not work with
multiple primary storeThe race condition will happen whenever there are multiple primary storages
and the CS tries to mount the secondary store to xenserver host simultaneously.

Due to synchronised block one mount will be successful and other thread will get the already
mounted SR. Without the fix the two thread will try to mount it parallely and one will fail
on Xenserver.

* pr/1765:
  Cloudstack 9586: When using local storage with Xenserver prepareTemplate does not work with
multiple primary store The race condition will happen whenever there are multiple primary
storages and the CS tries to mount the secondary store to xenserver host simultaneously. Due
to synchronised block one mount will be successful and other thread will get the already mounted
SR. Without the fix the two thread will try to mount it parallely and one will fail on Xenserver.

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


> When using local storage with Xenserver prepareTemplate does not work with multiple primary
store
> -------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-9586
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9586
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Secondary Storage, XenServer
>    Affects Versions: 4.5.2
>         Environment: XenServer 6.5 SP1
> Local Storage
>            Reporter: Abhinandan Prateek
>            Assignee: Abhinandan Prateek
>            Priority: Critical
>             Fix For: 4.10.0.0, 4.9.1.0, 4.8.2.0
>
>
> 2016-11-09 15:05:15,876 DEBUG [c.c.h.x.r.XenServerStorageProcessor] (DirectAgent-29:ctx-8d890b55)
Failed to destroy pbd
> SR_BACKEND_FAILURE_40The SR scan failed  [opterr=['INTERNAL_ERROR', 'Db_exn.Uniqueness_constraint_violation("VDI",
"uuid", "703f59ca-6e5e-38d3-bbef-707b5b14c704")']]
> 	at com.xensource.xenapi.Types.checkResponse(Types.java:2021)
> 	at com.xensource.xenapi.Connection.dispatch(Connection.java:395)
> 	at com.cloud.hypervisor.xenserver.resource.XenServerConnectionPool$XenServerConnection.dispatch(XenServerConnectionPool.java:462)
> 	at com.xensource.xenapi.SR.scan(SR.java:1257)
> 	at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.createFileSR(Xenserver625StorageProcessor.java:113)
> 	at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.createFileSr(Xenserver625StorageProcessor.java:139)
> 	at com.cloud.hypervisor.xenserver.resource.Xenserver625StorageProcessor.copyTemplateToPrimaryStorage(Xenserver625StorageProcessor.java:173)
> Root Cause: CloudPlatform creates a SR on each host, which points to the template location
on the secondary storage (secondary_Storage/template/tmpl/<account_id>/<template_id>).
This causes the database unique constraint violation when each XenServer tries to scan the
SR created on each host. The host that scans the SR last, throws the exception because VDI
was recognized already from the SR scan of the first host.



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