DaanHoogland commented on a change in pull request #2636: Fix limitation on tag
matching in 'migrateVolume' with disk offering replacement
URL: https://github.com/apache/cloudstack/pull/2636#discussion_r203406752
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File path: server/src/main/java/com/cloud/storage/VolumeApiServiceImpl.java
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@@ -2189,6 +2189,53 @@ protected void
validateConditionsToReplaceDiskOfferingOfVolume(VolumeVO volume,
s_logger.info(String.format("Changing disk offering to [uuid=%s] while
migrating volume [uuid=%s, name=%s].", newDiskOffering.getUuid(),
volume.getUuid(), volume.getName()));
}
+ /**
+ * Checks if the target storage supports the new disk offering.
+ * This validation is consistent with the mechanism used to select a
storage pool to deploy a volume when a virtual machine is deployed or when a
new data disk is allocated.
+ *
+ * The scenarios when this method returns true or false is presented in
the following table.
+ *
+ * <table border="1">
+ * <tr>
+ * <th>#</th><th>Disk offering tags</th><th>Storage
tags</th><th>Does the storage support the disk offering?</th>
+ * </tr>
+ * <body>
+ * <tr>
+ * <td>1</td><td>A,B</td><td>A</td><td>NO</td>
+ * </tr>
+ * <tr>
+ * <td>2</td><td>A,B,C</td><td>A,B,C,D,X</td><td>YES</td>
+ * </tr>
+ * <tr>
+ * <td>3</td><td>A,B,C</td><td>X,Y,Z</td><td>NO</td>
+ * </tr>
+ * <tr>
+ * <td>4</td><td>null</td><td>A,S,D</td><td>YES</td>
+ * </tr>
+ * <tr>
+ * <td>5</td><td>A</td><td>null</td><td>NO</td>
+ * </tr>
+ * <tr>
+ * <td>6</td><td>null</td><td>null</td><td>YES</td>
+ * </tr>
+ * </body>
+ * </table>
+ */
+ protected boolean doesTargetStorageSupportNewDiskOffering(StoragePool
destPool, DiskOfferingVO newDiskOffering) {
Review comment:
ok, nice subject: another valid usage is mutual dependent services. Or
dependency injection.
I this case my concern is that the implementation of tag matching is done in
several places while it should be uniform and thus implemented centrally.
doesTargetStorageASupportNewDiskOffering() is a specialisation of
does_this_entities_tags_match_the_resource_it_is_going_to(entity, resource)
which is applicable to volume/storage in case of new offering but also in case
of migration, and is also applicable for vm-serviceoffering/host-cluster-pod
etc. I cant' think of any others by head but these are surely there as well.
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