private EpochRecord WriteEpochRecordWithRetry(int epochNumber, Guid epochId, long lastEpochPosition,
Guid instanceId)
{
long pos = _writer.Checkpoint.ReadNonFlushed();
var epoch = new EpochRecord(pos, epochNumber, epochId, lastEpochPosition, DateTime.UtcNow, instanceId);
var rec = _recordFactory.CreateEpoch(epoch);
Log.Debug(
"=== Writing E{epochNumber}@{epochPosition}:{epochId:B} (previous epoch at {lastEpochPosition}). L={leaderId:B}.",
epochNumber, epoch.EpochPosition, epochId, lastEpochPosition, epoch.LeaderInstanceId);
if (!_writer.Write(rec, out pos))
{
epoch = new EpochRecord(pos, epochNumber, epochId, lastEpochPosition, DateTime.UtcNow, instanceId);
rec = _recordFactory.CreateEpoch(epoch);
if (!_writer.Write(rec, out pos))
{
throw new Exception($"Second write try failed at {epoch.EpochPosition}.");
}
}
_partitionManager.Initialize();
WriteEpochInformationWithRetry(epoch);
_writer.Flush();
_bus.Publish(new ReplicationTrackingMessage.WriterCheckpointFlushed());
_bus.Publish(new SystemMessage.EpochWritten(epoch));
return(epoch);
}
private EpochRecord WriteEpoch(int epochNumber, long lastPos, Guid instanceId)
{
long pos = _writer.Checkpoint.ReadNonFlushed();
var epoch = new EpochRecord(pos, epochNumber, Guid.NewGuid(), lastPos, DateTime.UtcNow, instanceId);
var rec = _recordFactory.CreateEpoch(epoch);
_writer.Write(rec, out _);
_writer.Flush();
return(epoch);
}