/// <summary>
/// Test that, if the writer crashes at the very beginning of a segment,
/// before any transactions are written, that the next newEpoch() call
/// returns the prior segment txid as its most recent segment.
/// </summary>
/// <exception cref="System.Exception"/>
public virtual void TestNewEpochAtBeginningOfSegment()
{
journal.NewEpoch(FakeNsinfo, 1);
journal.StartLogSegment(MakeRI(1), 1, NameNodeLayoutVersion.CurrentLayoutVersion);
journal.Journal(MakeRI(2), 1, 1, 2, QJMTestUtil.CreateTxnData(1, 2));
journal.FinalizeLogSegment(MakeRI(3), 1, 2);
journal.StartLogSegment(MakeRI(4), 3, NameNodeLayoutVersion.CurrentLayoutVersion);
QJournalProtocolProtos.NewEpochResponseProto resp = journal.NewEpoch(FakeNsinfo,
2);
NUnit.Framework.Assert.AreEqual(1, resp.GetLastSegmentTxId());
}
/// <exception cref="System.Exception"/>
public virtual void TestReturnsSegmentInfoAtEpochTransition()
{
ch.NewEpoch(1).Get();
ch.SetEpoch(1);
ch.StartLogSegment(1, NameNodeLayoutVersion.CurrentLayoutVersion).Get();
ch.SendEdits(1L, 1, 2, QJMTestUtil.CreateTxnData(1, 2)).Get();
// Switch to a new epoch without closing earlier segment
QJournalProtocolProtos.NewEpochResponseProto response = ch.NewEpoch(2).Get();
ch.SetEpoch(2);
NUnit.Framework.Assert.AreEqual(1, response.GetLastSegmentTxId());
ch.FinalizeLogSegment(1, 2).Get();
// Switch to a new epoch after just closing the earlier segment.
response = ch.NewEpoch(3).Get();
ch.SetEpoch(3);
NUnit.Framework.Assert.AreEqual(1, response.GetLastSegmentTxId());
// Start a segment but don't write anything, check newEpoch segment info
ch.StartLogSegment(3, NameNodeLayoutVersion.CurrentLayoutVersion).Get();
response = ch.NewEpoch(4).Get();
ch.SetEpoch(4);
// Because the new segment is empty, it is equivalent to not having
// started writing it. Hence, we should return the prior segment txid.
NUnit.Framework.Assert.AreEqual(1, response.GetLastSegmentTxId());
}