/// <summary>
/// Find the id of the last edit log transaction writen to a edit log
/// ledger.
/// </summary>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.Contrib.Bkjournal.BookKeeperJournalManager.SegmentEmptyException
/// "/>
private long RecoverLastTxId(EditLogLedgerMetadata l, bool fence)
{
LedgerHandle lh = null;
try
{
if (fence)
{
lh = bkc.OpenLedger(l.GetLedgerId(), BookKeeper.DigestType.Mac, Sharpen.Runtime.GetBytesForString
(digestpw, Charsets.Utf8));
}
else
{
lh = bkc.OpenLedgerNoRecovery(l.GetLedgerId(), BookKeeper.DigestType.Mac, Sharpen.Runtime.GetBytesForString
(digestpw, Charsets.Utf8));
}
}
catch (BKException bke)
{
throw new IOException("Exception opening ledger for " + l, bke);
}
catch (Exception ie)
{
Sharpen.Thread.CurrentThread().Interrupt();
throw new IOException("Interrupted opening ledger for " + l, ie);
}
BookKeeperEditLogInputStream @in = null;
try
{
long lastAddConfirmed = lh.GetLastAddConfirmed();
if (lastAddConfirmed == -1)
{
throw new BookKeeperJournalManager.SegmentEmptyException();
}
@in = new BookKeeperEditLogInputStream(lh, l, lastAddConfirmed);
long endTxId = HdfsConstants.InvalidTxid;
FSEditLogOp op = @in.ReadOp();
while (op != null)
{
if (endTxId == HdfsConstants.InvalidTxid || op.GetTransactionId() == endTxId + 1)
{
endTxId = op.GetTransactionId();
}
op = @in.ReadOp();
}
return(endTxId);
}
finally
{
if (@in != null)
{
@in.Close();
}
}
}
/// <summary>Finalize a log segment.</summary>
/// <remarks>
/// Finalize a log segment. If the journal manager is currently
/// writing to a ledger, ensure that this is the ledger of the log segment
/// being finalized.
/// Otherwise this is the recovery case. In the recovery case, ensure that
/// the firstTxId of the ledger matches firstTxId for the segment we are
/// trying to finalize.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
public override void FinalizeLogSegment(long firstTxId, long lastTxId)
{
CheckEnv();
string inprogressPath = InprogressZNode(firstTxId);
try
{
Stat inprogressStat = zkc.Exists(inprogressPath, false);
if (inprogressStat == null)
{
throw new IOException("Inprogress znode " + inprogressPath + " doesn't exist");
}
EditLogLedgerMetadata l = EditLogLedgerMetadata.Read(zkc, inprogressPath);
if (currentLedger != null)
{
// normal, non-recovery case
if (l.GetLedgerId() == currentLedger.GetId())
{
try
{
currentLedger.Close();
}
catch (BKException bke)
{
Log.Error("Error closing current ledger", bke);
}
currentLedger = null;
}
else
{
throw new IOException("Active ledger has different ID to inprogress. " + l.GetLedgerId
() + " found, " + currentLedger.GetId() + " expected");
}
}
if (l.GetFirstTxId() != firstTxId)
{
throw new IOException("Transaction id not as expected, " + l.GetFirstTxId() + " found, "
+ firstTxId + " expected");
}
l.FinalizeLedger(lastTxId);
string finalisedPath = FinalizedLedgerZNode(firstTxId, lastTxId);
try
{
l.Write(zkc, finalisedPath);
}
catch (KeeperException.NodeExistsException)
{
if (!l.Verify(zkc, finalisedPath))
{
throw new IOException("Node " + finalisedPath + " already exists" + " but data doesn't match"
);
}
}
maxTxId.Store(lastTxId);
zkc.Delete(inprogressPath, inprogressStat.GetVersion());
string inprogressPathFromCI = ci.Read();
if (inprogressPath.Equals(inprogressPathFromCI))
{
ci.Clear();
}
}
catch (KeeperException e)
{
throw new IOException("Error finalising ledger", e);
}
catch (Exception ie)
{
Sharpen.Thread.CurrentThread().Interrupt();
throw new IOException("Error finalising ledger", ie);
}
}