Google Cloud Spanner v1 API - Class ChangeStreamRecord.Types.PartitionEventRecord (5.13.0-beta06) 

public sealed class ChangeStreamRecord.Types.PartitionEventRecord : IMessage<ChangeStreamRecord.Types.PartitionEventRecord>, IEquatable<ChangeStreamRecord.Types.PartitionEventRecord>, IDeepCloneable<ChangeStreamRecord.Types.PartitionEventRecord>, IBufferMessage, IMessage

Reference documentation and code samples for the Google Cloud Spanner v1 API class ChangeStreamRecord.Types.PartitionEventRecord.

A partition event record describes key range changes for a change stream partition. The changes to a row defined by its primary key can be captured in one change stream partition for a specific time range, and then be captured in a different change stream partition for a different time range. This movement of key ranges across change stream partitions is a reflection of activities, such as Spanner's dynamic splitting and load balancing, etc. Processing this event is needed if users want to guarantee processing of the changes for any key in timestamp order. If time ordered processing of changes for a primary key is not needed, this event can be ignored. To guarantee time ordered processing for each primary key, if the event describes move-ins, the reader of this partition needs to wait until the readers of the source partitions have processed all records with timestamps <= this PartitionEventRecord.commit_timestamp, before advancing beyond this PartitionEventRecord. If the event describes move-outs, the reader can notify the readers of the destination partitions that they can continue processing.

Inheritance

object > ChangeStreamRecord.Types.PartitionEventRecord

Namespace

Google.Cloud.Spanner.V1

Assembly

Google.Cloud.Spanner.V1.dll

Constructors

PartitionEventRecord()

public PartitionEventRecord()

PartitionEventRecord(PartitionEventRecord)

public PartitionEventRecord(ChangeStreamRecord.Types.PartitionEventRecord other)
Parameter
Name Description
other ChangeStreamRecordTypesPartitionEventRecord

Properties

CommitTimestamp

public Timestamp CommitTimestamp { get; set; }

Indicates the commit timestamp at which the key range change occurred. DataChangeRecord.commit_timestamps, PartitionStartRecord.start_timestamps, PartitionEventRecord.commit_timestamps, and PartitionEndRecord.end_timestamps can have the same value in the same partition.

Property Value
Type Description
Timestamp

MoveInEvents

public RepeatedField<ChangeStreamRecord.Types.PartitionEventRecord.Types.MoveInEvent> MoveInEvents { get; }

Set when one or more key ranges are moved into the change stream partition identified by [partition_token][google.spanner.v1.ChangeStreamRecord.PartitionEventRecord.partition_token].

Example: Two key ranges are moved into partition (P1) from partition (P2) and partition (P3) in a single transaction at timestamp T.

The PartitionEventRecord returned in P1 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P1" move_in_events { source_partition_token: "P2" } move_in_events { source_partition_token: "P3" } }

The PartitionEventRecord returned in P2 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P2" move_out_events { destination_partition_token: "P1" } }

The PartitionEventRecord returned in P3 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P3" move_out_events { destination_partition_token: "P1" } }

Property Value
Type Description
RepeatedFieldChangeStreamRecordTypesPartitionEventRecordTypesMoveInEvent

MoveOutEvents

public RepeatedField<ChangeStreamRecord.Types.PartitionEventRecord.Types.MoveOutEvent> MoveOutEvents { get; }

Set when one or more key ranges are moved out of the change stream partition identified by [partition_token][google.spanner.v1.ChangeStreamRecord.PartitionEventRecord.partition_token].

Example: Two key ranges are moved out of partition (P1) to partition (P2) and partition (P3) in a single transaction at timestamp T.

The PartitionEventRecord returned in P1 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P1" move_out_events { destination_partition_token: "P2" } move_out_events { destination_partition_token: "P3" } }

The PartitionEventRecord returned in P2 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P2" move_in_events { source_partition_token: "P1" } }

The PartitionEventRecord returned in P3 will reflect the move as:

PartitionEventRecord { commit_timestamp: T partition_token: "P3" move_in_events { source_partition_token: "P1" } }

Property Value
Type Description
RepeatedFieldChangeStreamRecordTypesPartitionEventRecordTypesMoveOutEvent

PartitionToken

public string PartitionToken { get; set; }

Unique partition identifier describing the partition this event occurred on. [partition_token][google.spanner.v1.ChangeStreamRecord.PartitionEventRecord.partition_token] is equal to the partition token of the change stream partition currently queried to return this PartitionEventRecord.

Property Value
Type Description
string

RecordSequence

public string RecordSequence { get; set; }

Record sequence numbers are unique and monotonically increasing (but not necessarily contiguous) for a specific timestamp across record types in the same partition. To guarantee ordered processing, the reader should process records (of potentially different types) in record_sequence order for a specific timestamp in the same partition.

Property Value
Type Description
string