Enable MongoDB Heartbeat

This page describes how to enable MongoDB heartbeat in Incremental stage when there is no data written to MongoDB, so that the latency can be displayed accurately.

Overview

When moving data from a MongoDB instance, if there is no change for a long time, there will be latency displayed on the page.

By enabling MongoDB heartbeat, new UPDATE events are generated regularly, so that the latency is displayed accurately.

Prerequisites

• The user of MongoDB has UPDATE permission. The collection for heartbeats can be modified through the parameter dbHeartbeatCollection.
• Modify the DataJob Parameter to make sure that the value of parameter captureMode is CHANGE_STREAM.

Procedure

1. Go to the DataJob Details page. Click Functions > Modify DataJob Params in the upper-right corner.
2. At the Source tab, modify the values of the following parameters:
   • Modify the value of dbHeartbeatEnable to true.
   • Modify the value of dbHeartbeatCollection to test.__cc_hb_collection (the collection can be customized).
3. Create a collection in the Source instance:
   1. Create a collection test.__cc_hb_collection in MongoDB.
   2. Make sure that the user has UPDATE permission on this collection.
4. Go back to BladePipe, and click Save in the upper-right corner.
5. Click Submit.