|
public static CreateEmpty ( int maxTablesPerLevel = 4 ) : |
||
| maxTablesPerLevel | int | |
| return | ||
public void Initialize(long chaserCheckpoint)
{
Ensure.Nonnegative(chaserCheckpoint, "chaserCheckpoint");
//NOT THREAD SAFE (assumes one thread)
if (_initialized)
{
throw new IOException("TableIndex is already initialized.");
}
_initialized = true;
if (_inMem)
{
_indexMap = IndexMap.CreateEmpty(_maxTablesPerLevel);
_prepareCheckpoint = _indexMap.PrepareCheckpoint;
_commitCheckpoint = _indexMap.CommitCheckpoint;
return;
}
CreateIfDoesNotExist(_directory);
var indexmapFile = Path.Combine(_directory, IndexMapFilename);
// if TableIndex's CommitCheckpoint is >= amount of written TFChunk data,
// we'll have to remove some of PTables as they point to non-existent data
// this can happen (very unlikely, though) on master crash
try
{
_indexMap = IndexMap.FromFile(indexmapFile, maxTablesPerLevel: _maxTablesPerLevel, cacheDepth: _indexCacheDepth);
if (_indexMap.CommitCheckpoint >= chaserCheckpoint)
{
_indexMap.Dispose(TimeSpan.FromMilliseconds(5000));
throw new CorruptIndexException(String.Format("IndexMap's CommitCheckpoint ({0}) is greater than ChaserCheckpoint ({1}).", _indexMap.CommitCheckpoint, chaserCheckpoint));
}
}
catch (CorruptIndexException exc)
{
Log.ErrorException(exc, "ReadIndex is corrupted...");
LogIndexMapContent(indexmapFile);
DumpAndCopyIndex();
File.Delete(indexmapFile);
_indexMap = IndexMap.FromFile(indexmapFile, maxTablesPerLevel: _maxTablesPerLevel, cacheDepth: _indexCacheDepth);
}
_prepareCheckpoint = _indexMap.PrepareCheckpoint;
_commitCheckpoint = _indexMap.CommitCheckpoint;
// clean up all other remaining files
var indexFiles = _indexMap.InOrder().Select(x => Path.GetFileName(x.Filename))
.Union(new[] { IndexMapFilename });
var toDeleteFiles = Directory.EnumerateFiles(_directory).Select(Path.GetFileName)
.Except(indexFiles, StringComparer.OrdinalIgnoreCase);
foreach (var filePath in toDeleteFiles)
{
var file = Path.Combine(_directory, filePath);
File.SetAttributes(file, FileAttributes.Normal);
File.Delete(file);
}
}
