private long InitializeLastDatabaseEtagOnIndexCreation(TransactionOperationContext indexContext)
{
const string key = "LastEtag";
if (_environment.IsNew == false)
{
var tree = indexContext.Transaction.InnerTransaction.ReadTree(IndexSchema.LastDocumentEtagOnIndexCreationTree);
var result = tree?.Read(key);
return(result?.Reader.ReadLittleEndianInt64() ?? 0);
}
using (var queryContext = QueryOperationContext.Allocate(DocumentDatabase, _index))
using (queryContext.OpenReadTransaction())
using (Slice.From(indexContext.Allocator, key, out var slice))
{
var lastDatabaseEtag = DocumentsStorage.ReadLastEtag(queryContext.Documents.Transaction.InnerTransaction);
var tree = indexContext.Transaction.InnerTransaction.CreateTree(IndexSchema.LastDocumentEtagOnIndexCreationTree);
tree.Add(slice, lastDatabaseEtag);
return(lastDatabaseEtag);
}
}
public static bool ShouldReplace(Index index, ref bool?isSideBySide)
{
if (isSideBySide.HasValue == false)
{
isSideBySide = index.Name.StartsWith(Constants.Documents.Indexing.SideBySideIndexNamePrefix, StringComparison.OrdinalIgnoreCase);
}
if (isSideBySide == false)
{
return(false);
}
using (var context = QueryOperationContext.Allocate(index.DocumentDatabase, index))
using (index._contextPool.AllocateOperationContext(out TransactionOperationContext indexContext))
{
using (indexContext.OpenReadTransaction())
using (context.OpenReadTransaction())
{
indexContext.IgnoreStalenessDueToReduceOutputsToDelete = true;
try
{
var canReplace = index.IsStale(context, indexContext) == false;
if (canReplace)
{
isSideBySide = null;
}
return(canReplace);
}
finally
{
indexContext.IgnoreStalenessDueToReduceOutputsToDelete = false;
}
}
}
}