Cassandra Policies

Policy name

Duration

Conditions

Category

Description

Depressed Key Cache Hit Rate

30 min

cassandra.Cache.KeyCache.HitRate has an lower baseline deviation + a static threshold ≤ 0.85

WARNING

The hit rate for the key cache is lower than expected and is less than 85%. This condition has been persisting for at least the past 30 minutes.

Elevated Node Read Latency

30 min

cassandra.Keyspace.ReadLatency.OneMinuteRate has an upper baseline deviation

WARNING

The overall keyspace read latency on this Cassandra node has been higher than expected for at least 30 minutes.

Elevated Node Write Latency

30 min

cassandra.Keyspace.WriteLatency.OneMinuteRate has an upper baseline deviation

WARNING

The overall keyspace write latency on this Cassandra node has been higher than expected for at least 30 minutes.

Elevated Number of Pending Compaction Tasks

15 min

cassandra.Compaction.PendingTasks has an upper baseline deviation

WARNING

The number of pending compaction tasks has been higher than expected for at least the past 15 minutes. This could indicate that the node is falling behind on compaction tasks.

Elevated Number of Pending Thread Pool Tasks

15 min

cassandra.ThreadPools.*.PendingTasks has an upper baseline deviation

WARNING

For at least the past 15 minutes, the number of pending tasks for one or more thread pools has been higher than expected. This could indicate that the pools are falling behind on their tasks.

Unavailable Exceptions Greater Than Zero

5 min

cassandra.*Unavailables.OneMinuteRate has a static threshold ≤1

CRITICAL

The required number of nodes were unavailable for one or more requests.