/// <exception cref="System.IO.IOException"/>
internal static FSEditLogLoader.EditLogValidation ScanEditLog(FilePath file)
{
Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream @in;
try
{
@in = new Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream(file);
// read the header, initialize the inputstream, but do not check the
// layoutversion
@in.GetVersion(false);
}
catch (EditLogFileInputStream.LogHeaderCorruptException e)
{
Log.Warn("Log file " + file + " has no valid header", e);
return(new FSEditLogLoader.EditLogValidation(0, HdfsConstants.InvalidTxid, true));
}
long lastPos = 0;
long lastTxId = HdfsConstants.InvalidTxid;
long numValid = 0;
try
{
while (true)
{
long txid = HdfsConstants.InvalidTxid;
lastPos = @in.GetPosition();
try
{
if ((txid = @in.ScanNextOp()) == HdfsConstants.InvalidTxid)
{
break;
}
}
catch (Exception t)
{
FSImage.Log.Warn("Caught exception after scanning through " + numValid + " ops from "
+ @in + " while determining its valid length. Position was " + lastPos, t);
@in.Resync();
FSImage.Log.Warn("After resync, position is " + @in.GetPosition());
continue;
}
if (lastTxId == HdfsConstants.InvalidTxid || txid > lastTxId)
{
lastTxId = txid;
}
numValid++;
}
return(new FSEditLogLoader.EditLogValidation(lastPos, lastTxId, false));
}
finally
{
IOUtils.CloseStream(@in);
}
}
/// <exception cref="System.IO.IOException"/>
internal static FSEditLogLoader.EditLogValidation ValidateEditLog(FilePath file)
{
Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream @in;
try
{
@in = new Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream(file);
@in.GetVersion(true);
}
catch (EditLogFileInputStream.LogHeaderCorruptException e)
{
// causes us to read the header
// If the header is malformed or the wrong value, this indicates a corruption
Log.Warn("Log file " + file + " has no valid header", e);
return(new FSEditLogLoader.EditLogValidation(0, HdfsConstants.InvalidTxid, true));
}
try
{
return(FSEditLogLoader.ValidateEditLog(@in));
}
finally
{
IOUtils.CloseStream(@in);
}
}
