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From rhtyd <...@git.apache.org>
Subject [GitHub] cloudstack pull request #1302: CLOUDSTACK-9104: VM naming convention in case...
Date Tue, 28 Feb 2017 09:02:53 GMT
Github user rhtyd commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1302#discussion_r103405279
  
    --- Diff: plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java
---
    @@ -2226,17 +2227,33 @@ int getReservedCpuMHZ(VirtualMachineTO vmSpec) {
             return new String[] {datastoreDiskPath};
         }
     
    -    // Pair<internal CS name, vCenter display name>
    -    private Pair<String, String> composeVmNames(VirtualMachineTO vmSpec) {
    -        String vmInternalCSName = vmSpec.getName();
    -        String vmNameOnVcenter = vmSpec.getName();
    -        if (_instanceNameFlag && vmSpec.getHostName() != null) {
    -            vmNameOnVcenter = vmSpec.getHostName();
    +    /**
    +     * This method generates VM name for Vcenter and Cloudstack( when Hypervisor is VMware).
    +     * It generates VM name according to  _instanceNameFlag setting.
    +     *
    +     * @param VirtualMachineTO
    +     *        vmSpec
    +     * @return Pair<internal CS name, vCenter display name>. A pair which contain
'internal CS name'  and
    +     *         'vCenter display name'(vCenter knows VM by this name).
    +     **/
    +    protected Pair<String, String> composeVmNames(VirtualMachineTO vmSpec) {
    +
    +        String vmInternalCSName = "";
    +        String vmNameOnVcenter  = "";
    +        if(vmSpec != null)
    +        {
    +            vmInternalCSName = vmNameOnVcenter = vmSpec.getName();
    +            if (_instanceNameFlag == true && vmSpec.getType() == VirtualMachine.Type.User)
{
    +                String[] tokens = vmInternalCSName.split("-");
    +                if(tokens.length<3) throw new InvalidParameterValueException("Invalid
vmInternalCSName format: "+vmInternalCSName+" expected format : *-*-* (e.g -> i-x-y)");
// vmInternalCSName has format i-x-y-<instance.name>
    +                vmNameOnVcenter = String.format("%s-%s-%s-%s", tokens[0], tokens[1],
tokens[2], vmSpec.getHostName());
    --- End diff --
    
    The token length comparison may break backward compatibility for existing VMs that may
not conform to this scheme. Also, assuming the token length is 3 the line can be written as:
    `vmNameOnVcenter = String.format("%s-%s", vmInternalCSName, vmSpec.getHostName());`
    
    As per previous code, `vmNameOnVcenter = vmSpec.getHostName()`, which will introduce backward
compatibility issues for older 4.3 environments. Is there any code that handles for such old
VMs. If a 4.3 user decides to upgrade to 4.10+, their VMs might not start the next time someone
restarts. Please comment on how the change addresses backward compatibility issue.


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