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HDDS-4280. Document notable configurations for Recon. #1448

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avijayanhwx merged 1 commit into from
Oct 5, 2020
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HDDS-4280. Document notable configurations for Recon. #1448

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18 changes: 17 additions & 1 deletion hadoop-hdds/docs/content/feature/Recon.md
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Expand Up @@ -28,4 +28,20 @@ Recon is the Web UI and analytics service for Ozone. It's an optional component,
Recon collects all the data from an Ozone cluster and **store** them in a SQL database for further analyses.

1. Ozone Manager data is downloaded in the background by an async process. A RocksDB snapshots are created on OM side periodically, and the incremental data is copied to Recon and processed.
2. Datanodes can send Heartbeats not just to SCM but Recon. Recon can be a read-only listener of the Heartbeats and updates the local database based on the received information.
2. Datanodes can send Heartbeats not just to SCM but Recon. Recon can be a read-only listener of the Heartbeats and updates the local database based on the received information.

Once Recon is configured, we are ready to start the service.

{{< highlight bash >}}
ozone --daemon start recon
{{< /highlight >}}

## Notable configurations

key | default | description
----|---------|------------
ozone.recon.http-address | 0.0.0.0:9888 | The address and the base port where the Recon web UI will listen on.
ozone.recon.address | 0.0.0.0:9891 | RPC address of the Recon.
ozone.recon.db.dir | none | Directory where the Recon Server stores its metadata.
ozone.recon.om.db.dir | none | Directory where the Recon Server stores its OM snapshot DB.
recon.om.snapshot.task.interval.delay | 10m | Interval in MINUTES by Recon to request OM DB Snapshot.