The DataHub console provides a variety of metrics. On the topic details page, you can view the number of read and write requests, real-time traffic, and historical traffic of a specified topic. The following section describes the related metrics.
Metrics
QPS: number of read/write requests per second.
RPS: number of read/write records per second.
Throughput: read/write throughput per second. Unit: KB.
Throughput (Uncompressed): number of uncompressed read/write throughput per second. Unit: KB.
Fails: number of failed requests per second. Unit: KB.
Latency: read/write latency per request. Unit: microseconds.
QPS
QPS indicates the number of read requests and write requests per second. The following figure shows the details:
RPS
RPS indicates the number of read records and write records per second. The following figure shows the details:
Throughput
Throughput indicates the read and write throughput after compression. The following figure shows the details:
Throughput (Uncompressed)
Throughput (Uncompressed) is a new metric of DataHub V2.25.
Throughput (Uncompressed) indicates the read and write throughput without compression. The following figure shows the details:
On the Metric Statistics page, the throughput indicated by the Throughput metric may be higher than the throughput indicated by the Throughput (Uncompressed) metric in the following cases:
Compression is not enabled for the read and write requests of the current topic.
Compression is enabled, but read and write requests are not sent in batches and the write protocol is JSON.
Fails
Fails is a new metric of DataHub V2.25.
In a scenario where a single request needs to be written to multiple shards, the request is considered as a failed request if the request fails to be written to some shards.
Fails indicates the number of failed requests. The following figure shows the details:
Latency
Latency indicates the latency of read and write requests. The following figure shows the details:
Real-time and offline traffic metrics
You can view the charts of real-time and offline traffic metrics in the upper-right part of the project details page.
Historical Traffic and Real-time Traffic (Uncompressed) are new metrics of DataHub V2.25.
Real-time traffic
The following figure shows the chart of real-time traffic before compression.
The following figure shows the chart of real-time traffic after compression.
Historical traffic
Historical Traffic indicates the request traffic of the topic in the last seven days.
