Collecting object I/O level diagnostics

The following object I/O level diagnostic tables collect data on object I/O statistics:

object_io: Per node recent latency metrics by keyspace and table.
object_read_io_snapshot: Per node recent latency metrics, broken down by keyspace and table and orders data by mean read latency.
object_write_io_snapshot: Per node recent latency metrics, broken down by keyspace and table and orders data mean write latency.

The location of the dse.yaml file depends on the type of installation:

Package installations and Installer-Services installations: /etc/dse/dse.yaml
Tarball installations and Installer-No Services installations: <installation_location>/resources/dse/conf/dse.yaml

Procedure

To enable the collection of this data:

Edit the dse.yaml file.

In the dse.yaml file, set the enabled option for resource_level_latency_tracking_options to true.

# Data Resource latency tracking settings
resource_level_latency_tracking_options:
    enabled: true
    refresh_rate_ms: 10000

Optional: To control how often the statistics are refreshed, increase or decrease the refresh_rate_ms parameter.

The refresh_rate_ms specifies the length of the sampling period, that is, the frequency with which this data is updated.

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