A collection of timers and counters for various performance metrics.
Timer metrics are represented as floating point seconds.
request_timer = None¶
A greplin.scales.PmfStat timer for requests. This is a dict-like object with the following keys:
- count - number of requests that have been timed
- min - min latency
- max - max latency
- mean - mean latency
- stddev - standard deviation for latencies
- median - median latency
- 75percentile - 75th percentile latencies
- 95percentile - 95th percentile latencies
- 98percentile - 98th percentile latencies
- 99percentile - 99th percentile latencies
- 999percentile - 99.9th percentile latencies
connection_errors = None¶
A greplin.scales.IntStat count of the number of times that a request to a Cassandra node has failed due to a connection problem.
write_timeouts = None¶
A greplin.scales.IntStat count of write requests that resulted in a timeout.
read_timeouts = None¶
A greplin.scales.IntStat count of read requests that resulted in a timeout.
unavailables = None¶
A greplin.scales.IntStat count of write or read requests that failed due to an insufficient number of replicas being alive to meet the requested ConsistencyLevel.
other_errors = None¶
A greplin.scales.IntStat count of all other request failures, including failures caused by invalid requests, bootstrapping nodes, overloaded nodes, etc.
retries = None¶
A greplin.scales.IntStat count of the number of times a request was retried based on the RetryPolicy decision.
ignores = None¶
A greplin.scales.IntStat count of the number of times a failed request was ignored based on the RetryPolicy decision.
known_hosts = None¶
A greplin.scales.IntStat count of the number of nodes in the cluster that the driver is aware of, regardless of whether any connections are opened to those nodes.
connected_to = None¶
A greplin.scales.IntStat count of the number of nodes that the driver currently has at least one connection open to.
open_connections = None¶
A greplin.scales.IntStat count of the number connections the driver currently has open.
get_stats()[source]¶
Returns the metrics for the registered cluster instance.
set_stats_name(stats_name)[source]¶
Set the metrics stats name. The stats_name is a string used to access the metris through scales: scales.getStats()[<stats_name>] Default is ‘cassandra-<num>’.
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