Cassandra

This section lists the alerts for Cassandra.

CassandraAuthFailures CassandraCacheHitRateTooLow CassandraClientRequestFailure CassandraClientRequestUnavailable CassandraClusterTargetDown CassandraCommitlogTasksPending CassandraCompactionExecutorTasksBlocked CassandraCompactionTasksPending CassandraConnectionTimeouts

CassandraFlushWriterTasksBlocked CassandraHintsTooMany CassandraRepairTasksBlocked CassandraStorageExceptions CassandraTombstonesTooManyCritical CassandraTombstonesTooManyMajor CassandraTombstonesTooManyWarning CassandraViewWriteLatencyTooHigh

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CassandraAuthFailures

Severity	Warning
Summary	Cassandra authentication failures.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports an increased number of authentication failures.

CassandraCacheHitRateTooLow

Severity	Major
Summary	Cassandra cache hit rate is too low.
Description	The average hit rate for the {{ $labels.cache }} cache in the {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster is below 85%.

CassandraClientRequestFailure

Severity	Major
Summary	Cassandra client {{ $labels.operation }} request failure.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports an increased number of {{ $labels.operation }} operation failures. A failure is a non-timeout exception.

CassandraClientRequestUnavailable

Severity	Critical
Summary	Cassandra client {{ $labels.operation }} request is unavailable.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ labels.cassandra_cluster }} cluster reports an increased number of {{ $labels.operation }} operations ending with UnavailableException. There are not enough replicas alive to perform the {{ $labels.operation }} query with the requested consistency level.

CassandraClusterTargetDown

Severity	Critical
Summary	Cassandra cluster target down.
Description	Prometheus fails to scrape metrics from the {{ $labels.pod }} Pod of the {{ $labels.cluster }} cluster on the {{ $labels.node }} node.

CassandraCommitlogTasksPending

Severity	Warning
Summary	Cassandra commitlog has too many pending tasks.
Description	The commitlog in the {{ $labels.namespace }}/ {{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reached 15 pending tasks.

CassandraCompactionExecutorTasksBlocked

Severity	Warning
Summary	Cassandra compaction executor tasks are blocked.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ labels.cassandra_cluster }} cluster reports that {{ $value }} compaction executor tasks are blocked.

CassandraCompactionTasksPending

Severity	Warning
Summary	Cassandra has too many pending compactions.
Description	The pending compaction tasks in the {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ labels.cassandra_cluster }} cluster reached the threshold of 100 on average as measured over 30 minutes. This may occur due to a too low cluster I/O capacity.

CassandraConnectionTimeouts

Severity	Critical
Summary	Cassandra connection timeouts.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports an increased number of connection timeouts between nodes.

CassandraFlushWriterTasksBlocked

Severity	Warning
Summary	Cassandra flush writer tasks are blocked.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports that {{ $value } flush writer tasks are blocked.

CassandraHintsTooMany

Severity	Major
Summary	Cassandra has too many hints.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports an increased number of hints. Replica nodes are not available to accept mutation due to a failure or maintenance.

CassandraRepairTasksBlocked

Severity	Warning
Summary	Cassandra repair tasks are blocked.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports that {{ $value }} repair tasks are blocked.

CassandraStorageExceptions

Severity	Critical
Summary	Cassandra storage exceptions.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports an increased number of storage exceptions.

CassandraTombstonesTooManyCritical

Severity	Critical
Summary	Cassandra scanned 50000 tombstones.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster scanned {{ $value }} tombstones in 99% of read queries.

CassandraTombstonesTooManyMajor

Severity	Major
Summary	Cassandra scanned 25000 tombstones.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster scanned {{ $value }} tombstones in 99% of read queries.

CassandraTombstonesTooManyWarning

Severity	Warning
Summary	Cassandra scanned 10000 tombstones.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster scanned {{ $value }} tombstones in 99% of read queries.

CassandraViewWriteLatencyTooHigh

Severity	Warning
Summary	Cassandra high view/write latency.
Description	The {{ $labels.namespace }}/{{ $labels.pod }} Cassandra Pod in the {{ $labels.cassandra_cluster }} cluster reports over 1-second view/write latency for 99% of requests.