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https://issues.apache.org/jira/browse/CLOUDSTACK-10320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16411708#comment-16411708
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ASF subversion and git services commented on CLOUDSTACK-10320:
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Commit ca1760a46b67004d049b34ffbae4b635ec0a1561 in cloudstack's branch
refs/heads/master from [~marcaurele]
[ https://gitbox.apache.org/repos/asf?p=cloudstack.git;h=ca1760a ]
CLOUDSTACK-10320 - Invalid pair for response object breaking response parsing
(#2481)
> Invalid pair for response object breaking response parsing
> ----------------------------------------------------------
>
> Key: CLOUDSTACK-10320
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10320
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: API
> Reporter: Marc-Aurèle Brothier
> Assignee: Marc-Aurèle Brothier
> Priority: Major
>
> Under some circumstances, the API is returning an invalid response, for
> simplicity I will expose the JSON case. The API response on a
> listVirtualMachines can be this string:
> {code:java}
> { "listvirtualmachinesresponse" : ] } }{code}
> To understand how this is possible, assume you have more than one management
> server and one is processing the destroy of a virtual machine in the account
> X which is the only one it has. Another process is returning the result of
> listVirtualMachines for that same account X. During the listVM command, the
> result set is fetch with a searchAndDistinctCount due to the view
> ([https://github.com/apache/cloudstack/blob/master/server/src/main/java/com/cloud/api/query/QueryManagerImpl.java#L1024).]
> This is done through 2 queries in the GenericDao
> [https://github.com/apache/cloudstack/blob/master/framework/db/src/main/java/com/cloud/utils/db/GenericDaoBase.java#L1323]
> and if you encounter the _right_ conditions, the VM will be marked as
> removed in between those 2 queries. This results in having a Pair result with
> at least one object but a count of 0. Then following how is done the
> serialization of the response at
> [https://github.com/apache/cloudstack/blob/master/server/src/main/java/com/cloud/api/response/ApiResponseSerializer.java#L86]
> you will reach the case where your output is the one previously mentioned.
> To overcome this issue, there isn't a true fix but only a better pair
> response to ensure a correct response formatting. If the result set contains
> at least something, the count cannot be 0 but we cannot guess the correct
> answer, but only state it has at least one element.
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