private List <(IEnumerator <IndexEntry> Enumerator, long Count)> GetEnumerators()
{
var attempt = 0;
while (attempt < 5)
{
attempt++;
var enumerators = new List <(IEnumerator <IndexEntry> Enumerator, long Count)>();
try {
var tables = _tableIndex.IterateAllInOrder();
foreach (var table in tables)
{
Log.Information("Found table {id}. Type: {type}. Count: {count:N0}. Version: {version}",
table.Id, table.GetType(), table.Count, table.Version);
if (table.Version == PTableVersions.IndexV1)
{
throw new NotSupportedException("The Stream Existence Filter is not supported with V1 index files. Please disable the filter by setting StreamExistenceFilterSize to 0, or rebuild the indexes.");
}
var enumerator = table.IterateAllInOrder().GetEnumerator();
// advance into the enumerator so that we obtain a workitem in each table
// so that the ptables will definitely not be deleted until we are done.
if (enumerator.MoveNext())
{
// got workitem!
enumerators.Add((enumerator, table.Count));
}
else
{
enumerator.Dispose();
}
}
return(enumerators);
} catch (NotSupportedException) {
foreach (var pair in enumerators)
{
pair.Enumerator.Dispose();
}
throw;
} catch (FileBeingDeletedException) {
foreach (var pair in enumerators)
{
pair.Enumerator.Dispose();
}
Log.Debug("PTable is being deleted.");
}
}
throw new InvalidOperationException("Failed to get enumerators for the index.");
}
private void InitializeFromIndex(INameExistenceFilter filter)
{
if (filter.CurrentCheckpoint != -1L)
{
// can only use the index to build from scratch. if we have a checkpoint
// we need to build from the log in order to make use of it.
return;
}
Log.Information("Initializing from index");
// we have no checkpoint, build from the index. unfortunately there isn't
// a simple way to checkpoint in the middle of the index.
var tables = _tableIndex.IterateAllInOrder().ToList();
foreach (var table in tables)
{
if (table.Version == PTableVersions.IndexV1)
{
throw new NotSupportedException("The Stream Existence Filter is not supported with V1 index files. Please disable the filter by setting StreamExistenceFilterSize to 0, or rebuild the indexes.");
}
}
ulong?previousHash = null;
foreach (var table in tables)
{
foreach (var entry in table.IterateAllInOrder())
{
if (entry.Stream == previousHash)
{
continue;
}
// add regardless of version because event 0 may be scavenged
filter.Add(entry.Stream);
previousHash = entry.Stream;
}
}
// checkpoint at the end of the index.
if (previousHash != null)
{
filter.CurrentCheckpoint = _tableIndex.CommitCheckpoint;
}
}