Hi Suchithra, You are right, those metrics can only grow, at least until failover.
isBackPressured is reported as a boolean on subtask level. These samples are then aggregated and a ratio of (times-back-pressured / number-of-samples) is reported to the JobManager. Regards, Roman On Fri, Apr 9, 2021 at 12:44 PM V N, Suchithra (Nokia - IN/Bangalore) < suchithra....@nokia.com> wrote: > Hi Community, > > > > Need some information regarding metrics type mentioned in flink > documentation. > > https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html > > > > For the checkpoint metrics, below metrics are defined as of type gauge. As > per my understanding gauge type is used to represent a value which can > increase/decrease whereas counter is used to represent a value which will > keep increasing. Below metrics will be keep increasing during the job run. > Hence counter can be appropriate metric type for these. Please share your > input on this. > > > > numberOfCompletedCheckpoints > > The number of successfully completed checkpoints. > > Gauge > > numberOfFailedCheckpoints > > The number of failed checkpoints. > > Gauge > > totalNumberOfCheckpoints > > The number of total checkpoints (in progress, completed, failed). > > Gauge > > > > Also “isBackPressured" metric by the name it indicates as it returns > boolean value Yes/No. Flink documentation says backpressure is measured as > below, > > - *OK*: 0 <= Ratio <= 0.10 > - *LOW*: 0.10 < Ratio <= 0.5 > - *HIGH*: 0.5 < Ratio <= 1 > > What exactly this metric reports ? > > > > isBackPressured > > Whether the task is back-pressured. > > Gauge > > > > Thanks, > > Suchithra >
