An estimate of the commit timestamp that is usually lower than or equal to any timestamp for a record that will be delivered in the future on the stream. It is possible that, under particular circumstances that a future record has a timestamp that is lower than a previously seen timestamp. For an example usage see https://beam.apache.org/documentation/basics/#watermarks
getContinuationToken
A token that can be provided to a subsequent ReadChangeStream call
to pick up reading at the current stream position.
An estimate of the commit timestamp that is usually lower than or equal
to any timestamp for a record that will be delivered in the future on the
stream. It is possible that, under particular circumstances that a future
record has a timestamp that is lower than a previously seen timestamp.
An estimate of the commit timestamp that is usually lower than or equal
to any timestamp for a record that will be delivered in the future on the
stream. It is possible that, under particular circumstances that a future
record has a timestamp that is lower than a previously seen timestamp.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[],[],null,["# Cloud Bigtable V2 Client - Class Heartbeat (2.17.1)\n\nVersion latestkeyboard_arrow_down\n\n- [2.17.1 (latest)](/php/docs/reference/cloud-bigtable/latest/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.17.0](/php/docs/reference/cloud-bigtable/2.17.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.16.0](/php/docs/reference/cloud-bigtable/2.16.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.15.0](/php/docs/reference/cloud-bigtable/2.15.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.14.0](/php/docs/reference/cloud-bigtable/2.14.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.13.0](/php/docs/reference/cloud-bigtable/2.13.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.12.0](/php/docs/reference/cloud-bigtable/2.12.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.11.1](/php/docs/reference/cloud-bigtable/2.11.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.9.1](/php/docs/reference/cloud-bigtable/2.9.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.8.0](/php/docs/reference/cloud-bigtable/2.8.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.7.0](/php/docs/reference/cloud-bigtable/2.7.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.6.3](/php/docs/reference/cloud-bigtable/2.6.3/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.5.0](/php/docs/reference/cloud-bigtable/2.5.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.4.0](/php/docs/reference/cloud-bigtable/2.4.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.3.0](/php/docs/reference/cloud-bigtable/2.3.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.2.1](/php/docs/reference/cloud-bigtable/2.2.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.1.0](/php/docs/reference/cloud-bigtable/2.1.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [2.0.1](/php/docs/reference/cloud-bigtable/2.0.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.32.1](/php/docs/reference/cloud-bigtable/1.32.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.31.1](/php/docs/reference/cloud-bigtable/1.31.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.30.0](/php/docs/reference/cloud-bigtable/1.30.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.29.2](/php/docs/reference/cloud-bigtable/1.29.2/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.28.3](/php/docs/reference/cloud-bigtable/1.28.3/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.27.0](/php/docs/reference/cloud-bigtable/1.27.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.26.2](/php/docs/reference/cloud-bigtable/1.26.2/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.25.0](/php/docs/reference/cloud-bigtable/1.25.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.24.1](/php/docs/reference/cloud-bigtable/1.24.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.23.0](/php/docs/reference/cloud-bigtable/1.23.0/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.22.2](/php/docs/reference/cloud-bigtable/1.22.2/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.21.1](/php/docs/reference/cloud-bigtable/1.21.1/V2.ReadChangeStreamResponse.Heartbeat)\n- [1.20.3](/php/docs/reference/cloud-bigtable/1.20.3/V2.ReadChangeStreamResponse.Heartbeat) \nReference documentation and code samples for the Cloud Bigtable V2 Client class Heartbeat.\n\nA periodic message with information that can be used to checkpoint\nthe state of a stream.\n\nGenerated from protobuf message `google.bigtable.v2.ReadChangeStreamResponse.Heartbeat`\n\nNamespace\n---------\n\nGoogle \\\\ Cloud \\\\ Bigtable \\\\ V2 \\\\ ReadChangeStreamResponse\n\nMethods\n-------\n\n### __construct\n\nConstructor.\n\n### getContinuationToken\n\nA token that can be provided to a subsequent `ReadChangeStream` call\nto pick up reading at the current stream position.\n\n### hasContinuationToken\n\n### clearContinuationToken\n\n### setContinuationToken\n\nA token that can be provided to a subsequent `ReadChangeStream` call\nto pick up reading at the current stream position.\n\n### getEstimatedLowWatermark\n\nAn estimate of the commit timestamp that is usually lower than or equal\nto any timestamp for a record that will be delivered in the future on the\nstream. It is possible that, under particular circumstances that a future\nrecord has a timestamp that is lower than a previously seen timestamp.\n\nFor an example usage see\n\u003chttps://beam.apache.org/documentation/basics/#watermarks\u003e\n\n### hasEstimatedLowWatermark\n\n### clearEstimatedLowWatermark\n\n### setEstimatedLowWatermark\n\nAn estimate of the commit timestamp that is usually lower than or equal\nto any timestamp for a record that will be delivered in the future on the\nstream. It is possible that, under particular circumstances that a future\nrecord has a timestamp that is lower than a previously seen timestamp.\n\nFor an example usage see\n\u003chttps://beam.apache.org/documentation/basics/#watermarks\u003e"]]