private void UpdateScannerFields(ScanRequest rpc, ScanResponsePB response)
{
var scanTimestamp = response.HasSnapTimestamp
? (long)response.SnapTimestamp
: KuduClient.NoTimestamp;
var propagatedTimestamp = response.HasPropagatedTimestamp
? (long)response.PropagatedTimestamp
: KuduClient.NoTimestamp;
if (SnapshotTimestamp == KuduClient.NoTimestamp &&
scanTimestamp != KuduClient.NoTimestamp)
{
// If the server-assigned timestamp is present in the tablet
// server's response, store it in the scanner. The stored value
// is used for read operations in READ_AT_SNAPSHOT mode at
// other tablet servers in the context of the same scan.
SnapshotTimestamp = scanTimestamp;
}
long lastPropagatedTimestamp = KuduClient.NoTimestamp;
if (_readMode == ReadMode.ReadYourWrites &&
scanTimestamp != KuduClient.NoTimestamp)
{
// For READ_YOUR_WRITES mode, update the latest propagated timestamp
// with the chosen snapshot timestamp sent back from the server, to
// avoid unnecessarily wait for subsequent reads. Since as long as
// the chosen snapshot timestamp of the next read is greater than
// the previous one, the scan does not violate READ_YOUR_WRITES
// session guarantees.
lastPropagatedTimestamp = scanTimestamp;
}
else if (propagatedTimestamp != KuduClient.NoTimestamp)
{
// Otherwise we just use the propagated timestamp returned from
// the server as the latest propagated timestamp.
lastPropagatedTimestamp = propagatedTimestamp;
}
if (lastPropagatedTimestamp != KuduClient.NoTimestamp)
{
_client.LastPropagatedTimestamp = lastPropagatedTimestamp;
}
if (_isFaultTolerant && response.HasLastPrimaryKey)
{
_lastPrimaryKey = response.LastPrimaryKey;
}
if (response.ResourceMetrics is not null)
{
ResourceMetrics.Update(response.ResourceMetrics);
}
Tablet = rpc.Tablet;
Current = rpc.TakeResultSet();
_numRowsReturned += Current.Count;
}
public static ResultSet Create(
KuduSchema scanSchema,
ScanResponsePB scanResponse,
KuduMessage message)
{
if (scanResponse.ColumnarData is not null)
{
return(CreateResultSet(message, scanSchema, scanResponse.ColumnarData));
}
return(CreateResultSet(message, scanSchema, scanResponse.Data));
}
