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From DaanHoogland <...@git.apache.org>
Subject [GitHub] cloudstack pull request: Taking fast and efficient volume snapshot...
Date Wed, 11 May 2016 15:55:45 GMT
Github user DaanHoogland commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1403#discussion_r62875028
  
    --- Diff: engine/storage/datamotion/src/org/apache/cloudstack/storage/motion/StorageSystemDataMotionStrategy.java
---
    @@ -172,78 +254,214 @@ private void validate(SnapshotInfo snapshotInfo) {
             }
         }
     
    -    private Void handleCreateTemplateFromSnapshot(SnapshotInfo snapshotInfo, TemplateInfo
templateInfo, AsyncCompletionCallback<CopyCommandResult> callback) {
    +    private boolean usingBackendSnapshotFor(SnapshotInfo snapshotInfo) {
    +        String property = getProperty(snapshotInfo.getId(), "takeSnapshot");
    +
    +        return Boolean.parseBoolean(property);
    +    }
    +
    +    private void handleCreateTemplateFromSnapshot(SnapshotInfo snapshotInfo, TemplateInfo
templateInfo, AsyncCompletionCallback<CopyCommandResult> callback) {
             try {
                 snapshotInfo.processEvent(Event.CopyingRequested);
             }
             catch (Exception ex) {
                 throw new CloudRuntimeException("This snapshot is not currently in a state
where it can be used to create a template.");
             }
     
    -        HostVO hostVO = getHost(snapshotInfo.getDataStore().getId());
    -        DataStore srcDataStore = snapshotInfo.getDataStore();
    +        HostVO hostVO = getHost(snapshotInfo);
     
    -        String value = _configDao.getValue(Config.PrimaryStorageDownloadWait.toString());
    -        int primaryStorageDownloadWait = NumbersUtil.parseInt(value, Integer.parseInt(Config.PrimaryStorageDownloadWait.getDefaultValue()));
    -        CopyCommand copyCommand = new CopyCommand(snapshotInfo.getTO(), templateInfo.getTO(),
primaryStorageDownloadWait, VirtualMachineManager.ExecuteInSequence.value());
    -
    -        String errMsg = null;
    +        boolean usingBackendSnapshot = usingBackendSnapshotFor(snapshotInfo);
    +        boolean computeClusterSupportsResign = _clusterDao.computeClusterSupportsResign(hostVO.getClusterId());
     
    -        CopyCmdAnswer copyCmdAnswer = null;
    +        if (usingBackendSnapshot && !computeClusterSupportsResign) {
    +            throw new CloudRuntimeException("Unable to locate an applicable host with
which to perform a resignature operation");
    +        }
     
             try {
    -            _volumeService.grantAccess(snapshotInfo, hostVO, srcDataStore);
    +            if (usingBackendSnapshot) {
    +                createVolumeFromSnapshot(hostVO, snapshotInfo, true);
    +            }
     
    -            Map<String, String> srcDetails = getSnapshotDetails(_storagePoolDao.findById(srcDataStore.getId()),
snapshotInfo);
    +            DataStore srcDataStore = snapshotInfo.getDataStore();
     
    -            copyCommand.setOptions(srcDetails);
    +            String value = _configDao.getValue(Config.PrimaryStorageDownloadWait.toString());
    +            int primaryStorageDownloadWait = NumbersUtil.parseInt(value, Integer.parseInt(Config.PrimaryStorageDownloadWait.getDefaultValue()));
    +            CopyCommand copyCommand = new CopyCommand(snapshotInfo.getTO(), templateInfo.getTO(),
primaryStorageDownloadWait, VirtualMachineManager.ExecuteInSequence.value());
    +
    +            String errMsg = null;
    +
    +            CopyCmdAnswer copyCmdAnswer = null;
     
    -            copyCmdAnswer = (CopyCmdAnswer)_agentMgr.send(hostVO.getId(), copyCommand);
    -        }
    -        catch (Exception ex) {
    -            throw new CloudRuntimeException(ex.getMessage());
    -        }
    -        finally {
                 try {
    -                _volumeService.revokeAccess(snapshotInfo, hostVO, srcDataStore);
    +                // If we are using a back-end snapshot, then we should still have access
to it from the hosts in the cluster that hostVO is in
    +                // (because we passed in true as the third parameter to createVolumeFromSnapshot
above).
    +                if (usingBackendSnapshot == false) {
    +                    _volumeService.grantAccess(snapshotInfo, hostVO, srcDataStore);
    +                }
    +
    +                Map<String, String> srcDetails = getSnapshotDetails(snapshotInfo);
    +
    +                copyCommand.setOptions(srcDetails);
    +
    +                copyCmdAnswer = (CopyCmdAnswer)_agentMgr.send(hostVO.getId(), copyCommand);
                 }
                 catch (Exception ex) {
    -                s_logger.debug(ex.getMessage(), ex);
    +                throw new CloudRuntimeException("Failed to create template from snapshot
: " + ex.getMessage());
                 }
    +            finally {
    +                try {
    +                    _volumeService.revokeAccess(snapshotInfo, hostVO, srcDataStore);
    +                }
    +                catch (Exception ex) {
    +                    s_logger.warn(ex.getMessage(), ex);
    +                }
     
    -            if (copyCmdAnswer == null || !copyCmdAnswer.getResult()) {
    -                if (copyCmdAnswer != null && copyCmdAnswer.getDetails() != null
&& !copyCmdAnswer.getDetails().isEmpty()) {
    -                    errMsg = copyCmdAnswer.getDetails();
    +                if (copyCmdAnswer == null || !copyCmdAnswer.getResult()) {
    +                    if (copyCmdAnswer != null && !StringUtils.isEmpty(copyCmdAnswer.getDetails()))
{
    +                        errMsg = copyCmdAnswer.getDetails();
    +                    }
    +                    else {
    +                        errMsg = "Unable to create template from snapshot";
    +                    }
                     }
    -                else {
    -                    errMsg = "Unable to perform host-side operation";
    +
    +                try {
    +                    if (StringUtils.isEmpty(errMsg)) {
    +                        snapshotInfo.processEvent(Event.OperationSuccessed);
    +                    }
    +                    else {
    +                        snapshotInfo.processEvent(Event.OperationFailed);
    +                    }
    +                }
    +                catch (Exception ex) {
    +                    s_logger.warn(ex.getMessage(), ex);
                     }
                 }
     
    -            try {
    -                if (errMsg == null) {
    -                    snapshotInfo.processEvent(Event.OperationSuccessed);
    +            CopyCommandResult result = new CopyCommandResult(null, copyCmdAnswer);
    +
    +            result.setResult(errMsg);
    +
    +            callback.complete(result);
    +        }
    +        finally {
    +            if (usingBackendSnapshot) {
    +                deleteVolumeFromSnapshot(snapshotInfo);
    +            }
    +        }
    +    }
    +
    +    /**
    +     * Clones a template present on the storage to a new volume and resignatures it.
    +     *
    +     * @param srcData   source template
    +     * @param destData  destination ROOT volume
    +     * @param callback  for async
    +     */
    +    private void handleCreateVolumeFromTemplateBothOnStorageSystem(DataObject srcData,
DataObject destData, AsyncCompletionCallback<CopyCommandResult> callback) {
    +        Preconditions.checkArgument(srcData != null, "Passing 'null' to srcData of handleCreateVolumeFromTemplateBothOnStorageSystem
is not supported.");
    +        Preconditions.checkArgument(destData != null, "Passing 'null' to destData of
handleCreateVolumeFromTemplateBothOnStorageSystem is not supported.");
    +
    +        CopyCmdAnswer copyCmdAnswer = null;
    +        String errMsg = null;
    +
    +        TemplateInfo templateInfo = (TemplateInfo)srcData;
    +        VolumeInfo volumeInfo = (VolumeInfo)destData;
    +
    +        HostVO hostVO = getHost(volumeInfo.getDataCenterId(), true);
    +
    +        if (hostVO == null) {
    +            throw new CloudRuntimeException("Unable to locate a host capable of resigning
in the zone with the following ID: " + volumeInfo.getDataCenterId());
    +        }
    +
    +        boolean computeClusterSupportsResign = _clusterDao.computeClusterSupportsResign(hostVO.getClusterId());
    +
    +        if (!computeClusterSupportsResign) {
    +            throw new CloudRuntimeException("Unable to locate an applicable host with
which to perform a resignature operation");
    +        }
    +
    +        try {
    +            VolumeDetailVO volumeDetail = new VolumeDetailVO(volumeInfo.getId(),
    +                    "cloneOfTemplate",
    +                    String.valueOf(templateInfo.getId()),
    +                    false);
    +
    +            volumeDetail = _volumeDetailsDao.persist(volumeDetail);
    +
    +            AsyncCallFuture<VolumeApiResult> future = _volumeService.createVolumeAsync(volumeInfo,
volumeInfo.getDataStore());
    +            VolumeApiResult result = future.get();
    +
    +            if (volumeDetail != null) {
    +                _volumeDetailsDao.remove(volumeDetail.getId());
    +            }
    +
    +            if (result.isFailed()) {
    +                s_logger.warn("Failed to create a volume: " + result.getResult());
    +
    +                throw new CloudRuntimeException(result.getResult());
    +            }
    +
    +            volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
    +
    +            volumeInfo.processEvent(Event.MigrationRequested);
    +
    +            volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
    +
    +            copyCmdAnswer = performResignature(volumeInfo, hostVO);
    +
    +            if (copyCmdAnswer == null || !copyCmdAnswer.getResult()) {
    +                if (copyCmdAnswer != null && !StringUtils.isEmpty(copyCmdAnswer.getDetails()))
{
    +                    throw new CloudRuntimeException(copyCmdAnswer.getDetails());
                     }
                     else {
    -                    snapshotInfo.processEvent(Event.OperationFailed);
    +                    throw new CloudRuntimeException("Unable to create a volume from a
template");
                     }
                 }
    -            catch (Exception ex) {
    -                s_logger.debug(ex.getMessage(), ex);
    +        } catch (Exception ex) {
    +            try {
    +                volumeInfo.getDataStore().getDriver().deleteAsync(volumeInfo.getDataStore(),
volumeInfo, null);
    +            } catch (Exception e) {
    +                s_logger.warn("Exception while deleting volume on the backend " + e.getMessage());
                 }
    +
    +            throw new CloudRuntimeException("Create volume from template (ID = " + templateInfo.getId()
+ ") failed " + ex.getMessage());
             }
     
             CopyCommandResult result = new CopyCommandResult(null, copyCmdAnswer);
     
             result.setResult(errMsg);
     
             callback.complete(result);
    -
    -        return null;
         }
     
    -    private Void handleCreateVolumeFromSnapshotBothOnStorageSystem(SnapshotInfo snapshotInfo,
VolumeInfo volumeInfo, AsyncCompletionCallback<CopyCommandResult> callback) {
    +    private void handleCreateVolumeFromSnapshotBothOnStorageSystem(SnapshotInfo snapshotInfo,
VolumeInfo volumeInfo, AsyncCompletionCallback<CopyCommandResult> callback) {
    --- End diff --
    
    this method has become 75 lines. let's split it (and the likes)


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