private void PurgeCheckpointsOlderThan(FSImageTransactionalStorageInspector inspector
, long minTxId)
{
foreach (FSImageStorageInspector.FSImageFile image in inspector.GetFoundImages())
{
if (image.GetCheckpointTxId() < minTxId)
{
purger.PurgeImage(image);
}
}
}
/// <exception cref="System.IO.IOException"/>
internal virtual void PurgeCheckpoinsAfter(NNStorage.NameNodeFile nnf, long fromTxId
)
{
FSImageTransactionalStorageInspector inspector = new FSImageTransactionalStorageInspector
(EnumSet.Of(nnf));
storage.InspectStorageDirs(inspector);
foreach (FSImageStorageInspector.FSImageFile image in inspector.GetFoundImages())
{
if (image.GetCheckpointTxId() > fromTxId)
{
purger.PurgeImage(image);
}
}
}
/// <param name="inspector">inspector that has already inspected all storage dirs</param>
/// <returns>
/// the transaction ID corresponding to the oldest checkpoint
/// that should be retained.
/// </returns>
private long GetImageTxIdToRetain(FSImageTransactionalStorageInspector inspector)
{
IList <FSImageStorageInspector.FSImageFile> images = inspector.GetFoundImages();
TreeSet <long> imageTxIds = Sets.NewTreeSet();
foreach (FSImageStorageInspector.FSImageFile image in images)
{
imageTxIds.AddItem(image.GetCheckpointTxId());
}
IList <long> imageTxIdsList = Lists.NewArrayList(imageTxIds);
if (imageTxIdsList.IsEmpty())
{
return(0);
}
Sharpen.Collections.Reverse(imageTxIdsList);
int toRetain = Math.Min(numCheckpointsToRetain, imageTxIdsList.Count);
long minTxId = imageTxIdsList[toRetain - 1];
Log.Info("Going to retain " + toRetain + " images with txid >= " + minTxId);
return(minTxId);
}