public virtual int Compare(KeyValuePair <AsyncLogger, QJournalProtocolProtos.PrepareRecoveryResponseProto
> a, KeyValuePair <AsyncLogger, QJournalProtocolProtos.PrepareRecoveryResponseProto
> b)
{
QJournalProtocolProtos.PrepareRecoveryResponseProto r1 = a.Value;
QJournalProtocolProtos.PrepareRecoveryResponseProto r2 = b.Value;
// A response that has data for a segment is always better than one
// that doesn't.
if (r1.HasSegmentState() != r2.HasSegmentState())
{
return(Booleans.Compare(r1.HasSegmentState(), r2.HasSegmentState()));
}
if (!r1.HasSegmentState())
{
// Neither has a segment, so neither can be used for recover.
// Call them equal.
return(0);
}
// They both have a segment.
QJournalProtocolProtos.SegmentStateProto r1Seg = r1.GetSegmentState();
QJournalProtocolProtos.SegmentStateProto r2Seg = r2.GetSegmentState();
Preconditions.CheckArgument(r1Seg.GetStartTxId() == r2Seg.GetStartTxId(), "Should only be called with responses for corresponding segments: "
+ "%s and %s do not have the same start txid.", r1, r2);
// If one is in-progress but the other is finalized,
// the finalized one is greater.
if (r1Seg.GetIsInProgress() != r2Seg.GetIsInProgress())
{
return(Booleans.Compare(!r1Seg.GetIsInProgress(), !r2Seg.GetIsInProgress()));
}
if (!r1Seg.GetIsInProgress())
{
// If both are finalized, they should match lengths
if (r1Seg.GetEndTxId() != r2Seg.GetEndTxId())
{
throw new Exception("finalized segs with different lengths: " + r1 + ", " + r2);
}
return(0);
}
// Both are in-progress.
long r1SeenEpoch = Math.Max(r1.GetAcceptedInEpoch(), r1.GetLastWriterEpoch());
long r2SeenEpoch = Math.Max(r2.GetAcceptedInEpoch(), r2.GetLastWriterEpoch());
return(ComparisonChain.Start().Compare(r1SeenEpoch, r2SeenEpoch).Compare(r1.GetSegmentState
().GetEndTxId(), r2.GetSegmentState().GetEndTxId()).Result());
}
public virtual void TestScanEditLog()
{
// use a future layout version
journal.StartLogSegment(MakeRI(1), 1, NameNodeLayoutVersion.CurrentLayoutVersion
- 1);
// in the segment we write garbage editlog, which can be scanned but
// cannot be decoded
int numTxns = 5;
byte[] ops = QJMTestUtil.CreateGabageTxns(1, 5);
journal.Journal(MakeRI(2), 1, 1, numTxns, ops);
// verify the in-progress editlog segment
QJournalProtocolProtos.SegmentStateProto segmentState = journal.GetSegmentInfo(1);
NUnit.Framework.Assert.IsTrue(segmentState.GetIsInProgress());
NUnit.Framework.Assert.AreEqual(numTxns, segmentState.GetEndTxId());
NUnit.Framework.Assert.AreEqual(1, segmentState.GetStartTxId());
// finalize the segment and verify it again
journal.FinalizeLogSegment(MakeRI(3), 1, numTxns);
segmentState = journal.GetSegmentInfo(1);
NUnit.Framework.Assert.IsFalse(segmentState.GetIsInProgress());
NUnit.Framework.Assert.AreEqual(numTxns, segmentState.GetEndTxId());
NUnit.Framework.Assert.AreEqual(1, segmentState.GetStartTxId());
}