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From DaanHoogland <...@git.apache.org>
Subject [GitHub] cloudstack pull request: Taking fast and efficient volume snapshot...
Date Thu, 12 May 2016 19:39:29 GMT
Github user DaanHoogland commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1403#discussion_r63083577
  
    --- Diff: engine/storage/datamotion/src/org/apache/cloudstack/storage/motion/StorageSystemDataMotionStrategy.java
---
    @@ -255,99 +473,123 @@ private Void handleCreateVolumeFromSnapshotBothOnStorageSystem(SnapshotInfo
snap
     
                 VolumeApiResult result = future.get();
     
    +            if (volumeDetail != null) {
    +                _volumeDetailsDao.remove(volumeDetail.getId());
    +            }
    +
                 if (result.isFailed()) {
    -                s_logger.debug("Failed to create a volume: " + result.getResult());
    +                s_logger.warn("Failed to create a volume: " + result.getResult());
     
                     throw new CloudRuntimeException(result.getResult());
                 }
    -        }
    -        catch (Exception ex) {
    -            throw new CloudRuntimeException(ex.getMessage());
    -        }
     
    -        volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
    +            volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
     
    -        volumeInfo.processEvent(Event.MigrationRequested);
    +            volumeInfo.processEvent(Event.MigrationRequested);
     
    -        volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
    +            volumeInfo = _volumeDataFactory.getVolume(volumeInfo.getId(), volumeInfo.getDataStore());
     
    -        HostVO hostVO = getHost(snapshotInfo.getDataStore().getId());
    -
    -        String value = _configDao.getValue(Config.PrimaryStorageDownloadWait.toString());
    -        int primaryStorageDownloadWait = NumbersUtil.parseInt(value, Integer.parseInt(Config.PrimaryStorageDownloadWait.getDefaultValue()));
    -        CopyCommand copyCommand = new CopyCommand(snapshotInfo.getTO(), volumeInfo.getTO(),
primaryStorageDownloadWait, VirtualMachineManager.ExecuteInSequence.value());
    +            if (useCloning) {
    +                copyCmdAnswer = performResignature(volumeInfo, hostVO);
    +            }
    +            else {
    +                // asking for a XenServer host here so we don't always prefer to use
XenServer hosts that support resigning
    +                // even when we don't need those hosts to do this kind of copy work
    +                hostVO = getHost(snapshotInfo.getDataCenterId(), false);
     
    -        CopyCmdAnswer copyCmdAnswer = null;
    +                copyCmdAnswer = performCopyOfVdi(volumeInfo, snapshotInfo, hostVO);
    +            }
     
    -        try {
    -            _volumeService.grantAccess(snapshotInfo, hostVO, snapshotInfo.getDataStore());
    -            _volumeService.grantAccess(volumeInfo, hostVO, volumeInfo.getDataStore());
    +            if (copyCmdAnswer == null || !copyCmdAnswer.getResult()) {
    +                if (copyCmdAnswer != null && !StringUtils.isEmpty(copyCmdAnswer.getDetails()))
{
    +                    errMsg = copyCmdAnswer.getDetails();
    +                }
    +                else {
    +                    errMsg = "Unable to create volume from snapshot";
    +                }
    +            }
    +        }
    +        catch (Exception ex) {
    +            errMsg = ex.getMessage() != null ? ex.getMessage() : "Copy operation failed";
    +        }
     
    -            Map<String, String> srcDetails = getSnapshotDetails(_storagePoolDao.findById(snapshotInfo.getDataStore().getId()),
snapshotInfo);
    +        CopyCommandResult result = new CopyCommandResult(null, copyCmdAnswer);
     
    -            copyCommand.setOptions(srcDetails);
    +        result.setResult(errMsg);
     
    -            Map<String, String> destDetails = getVolumeDetails(volumeInfo);
    +        callback.complete(result);
    +    }
     
    -            copyCommand.setOptions2(destDetails);
    +    /**
    +     * If the underlying storage system is making use of read-only snapshots, this gives
the storage system the opportunity to
    +     * create a volume from the snapshot so that we can copy the VHD file that should
be inside of the snapshot to secondary storage.
    +     *
    +     * The resultant volume must be writable because we need to resign the SR and the
VDI that should be inside of it before we copy
    +     * the VHD file to secondary storage.
    +     *
    +     * If the storage system is using writable snapshots, then nothing need be done by
that storage system here because we can just
    +     * resign the SR and the VDI that should be inside of the snapshot before copying
the VHD file to secondary storage.
    +     */
    +    private void createVolumeFromSnapshot(HostVO hostVO, SnapshotInfo snapshotInfo, boolean
keepGrantedAccess) {
    +        SnapshotDetailsVO snapshotDetails = handleSnapshotDetails(snapshotInfo.getId(),
"tempVolume", "create");
     
    -            copyCmdAnswer = (CopyCmdAnswer)_agentMgr.send(hostVO.getId(), copyCommand);
    -        }
    -        catch (Exception ex) {
    -            throw new CloudRuntimeException(ex.getMessage());
    +        try {
    +            snapshotInfo.getDataStore().getDriver().createAsync(snapshotInfo.getDataStore(),
snapshotInfo, null);
             }
             finally {
    -            try {
    -                _volumeService.revokeAccess(snapshotInfo, hostVO, snapshotInfo.getDataStore());
    -            }
    -            catch (Exception ex) {
    -                s_logger.debug(ex.getMessage(), ex);
    -            }
    -
    -            try {
    -                _volumeService.revokeAccess(volumeInfo, hostVO, volumeInfo.getDataStore());
    -            }
    -            catch (Exception ex) {
    -                s_logger.debug(ex.getMessage(), ex);
    -            }
    +            _snapshotDetailsDao.remove(snapshotDetails.getId());
             }
     
    -        String errMsg = null;
    +        CopyCmdAnswer copyCmdAnswer = performResignature(snapshotInfo, hostVO, keepGrantedAccess);
     
             if (copyCmdAnswer == null || !copyCmdAnswer.getResult()) {
    -            if (copyCmdAnswer != null && copyCmdAnswer.getDetails() != null &&
!copyCmdAnswer.getDetails().isEmpty()) {
    -                errMsg = copyCmdAnswer.getDetails();
    +            if (copyCmdAnswer != null && !StringUtils.isEmpty(copyCmdAnswer.getDetails()))
{
    +                throw new CloudRuntimeException(copyCmdAnswer.getDetails());
                 }
                 else {
    -                errMsg = "Unable to perform host-side operation";
    +                throw new CloudRuntimeException("Unable to create volume from snapshot");
                 }
             }
    +    }
     
    -        CopyCommandResult result = new CopyCommandResult(null, copyCmdAnswer);
    +    /**
    +     * If the underlying storage system needed to create a volume from a snapshot for
createVolumeFromSnapshot(HostVO, SnapshotInfo), then
    +     * this is its opportunity to delete that temporary volume and restore properties
in snapshot_details to the way they were before the
    --- End diff --
    
    Well, in the comment you speak of opportunity. It seems this is not the opportunity but
the grabbing of an opportunity that is found at some other place in the code. In other words,
I don't understand the use of the word hence I don't understand the comment.


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