/// <exception cref="System.IO.IOException"/>
internal EditLogBackupInputStream(string name)
{
address = name;
inner = new EditLogBackupInputStream.ByteBufferInputStream();
@in = null;
reader = null;
}
/// <exception cref="System.IO.IOException"/>
internal virtual void SetBytes(byte[] newBytes, int version)
{
inner.SetData(newBytes);
tracker = new FSEditLogLoader.PositionTrackingInputStream(inner);
@in = new DataInputStream(tracker);
this.version = version;
reader = new FSEditLogOp.Reader(@in, tracker, version);
}
/// <exception cref="Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream.LogHeaderCorruptException
/// "/>
/// <exception cref="System.IO.IOException"/>
private void Init(bool verifyLayoutVersion)
{
Preconditions.CheckState(state == EditLogFileInputStream.State.Uninit);
BufferedInputStream bin = null;
try
{
fStream = log.GetInputStream();
bin = new BufferedInputStream(fStream);
tracker = new FSEditLogLoader.PositionTrackingInputStream(bin);
dataIn = new DataInputStream(tracker);
try
{
logVersion = ReadLogVersion(dataIn, verifyLayoutVersion);
}
catch (EOFException)
{
throw new EditLogFileInputStream.LogHeaderCorruptException("No header found in log"
);
}
// We assume future layout will also support ADD_LAYOUT_FLAGS
if (NameNodeLayoutVersion.Supports(LayoutVersion.Feature.AddLayoutFlags, logVersion
) || logVersion < NameNodeLayoutVersion.CurrentLayoutVersion)
{
try
{
LayoutFlags.Read(dataIn);
}
catch (EOFException)
{
throw new EditLogFileInputStream.LogHeaderCorruptException("EOF while reading layout "
+ "flags from log");
}
}
reader = new FSEditLogOp.Reader(dataIn, tracker, logVersion);
reader.SetMaxOpSize(maxOpSize);
state = EditLogFileInputStream.State.Open;
}
finally
{
if (reader == null)
{
IOUtils.Cleanup(Log, dataIn, tracker, bin, fStream);
state = EditLogFileInputStream.State.Closed;
}
}
}
/// <summary>Construct BookKeeper edit log input stream.</summary>
/// <remarks>
/// Construct BookKeeper edit log input stream.
/// Starts reading from firstBookKeeperEntry. This allows the stream
/// to take a shortcut during recovery, as it doesn't have to read
/// every edit log transaction to find out what the last one is.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
internal BookKeeperEditLogInputStream(LedgerHandle lh, EditLogLedgerMetadata metadata
, long firstBookKeeperEntry)
{
this.lh = lh;
this.firstTxId = metadata.GetFirstTxId();
this.lastTxId = metadata.GetLastTxId();
this.logVersion = metadata.GetDataLayoutVersion();
this.inProgress = metadata.IsInProgress();
if (firstBookKeeperEntry < 0 || firstBookKeeperEntry > lh.GetLastAddConfirmed())
{
throw new IOException("Invalid first bk entry to read: " + firstBookKeeperEntry +
", LAC: " + lh.GetLastAddConfirmed());
}
BufferedInputStream bin = new BufferedInputStream(new BookKeeperEditLogInputStream.LedgerInputStream
(lh, firstBookKeeperEntry));
tracker = new FSEditLogLoader.PositionTrackingInputStream(bin);
DataInputStream @in = new DataInputStream(tracker);
reader = new FSEditLogOp.Reader(@in, tracker, logVersion);
}
/// <exception cref="System.IO.IOException"/>
internal virtual void Clear()
{
SetBytes(null, 0);
reader = null;
this.version = 0;
}
