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telegraf/plugins/inputs/cassandra/README.md

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Cassandra Input Plugin

Deprecated in version 1.7: Please use the jolokia2 plugin with the cassandra.conf example configuration.

Plugin arguments

  • context string: Context root used for jolokia url
  • servers []string: List of servers with the format <user:passwd@><host>:port"
  • metrics []string: List of Jmx paths that identify mbeans attributes

Description

The Cassandra plugin collects Cassandra 3 / JVM metrics exposed as MBean's attributes through jolokia REST endpoint. All metrics are collected for each server configured.

See: https://jolokia.org/ and Cassandra Documentation

Measurements

Cassandra plugin produces one or more measurements for each metric configured, adding Server's name as host tag. More than one measurement is generated when querying table metrics with a wildcard for the keyspace or table name.

Given a configuration like:

# Read Cassandra metrics through Jolokia
[[inputs.cassandra]]
  ## DEPRECATED: The cassandra plugin has been deprecated.  Please use the
  ## jolokia2 plugin instead.
  ##
  ## see https://github.com/influxdata/telegraf/tree/master/plugins/inputs/jolokia2

  context = "/jolokia/read"
  ## List of cassandra servers exposing jolokia read service
  servers = ["myuser:mypassword@10.10.10.1:8778","10.10.10.2:8778",":8778"]
  ## List of metrics collected on above servers
  ## Each metric consists of a jmx path.
  ## This will collect all heap memory usage metrics from the jvm and
  ## ReadLatency metrics for all keyspaces and tables.
  ## "type=Table" in the query works with Cassandra3.0. Older versions might
  ## need to use "type=ColumnFamily"
  metrics  = [
    "/java.lang:type=Memory/HeapMemoryUsage",
    "/org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=ReadLatency"
  ]

The collected metrics will be:

javaMemory,host=myHost,mname=HeapMemoryUsage HeapMemoryUsage_committed=1040187392,HeapMemoryUsage_init=1050673152,HeapMemoryUsage_max=1040187392,HeapMemoryUsage_used=368155000 1459551767230567084

Useful Metrics

Here is a list of metrics that might be useful to monitor your cassandra cluster. This was put together from multiple sources on the web.

measurement = javaGarbageCollector

  • /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionTime
  • /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionCount
  • /java.lang:type=GarbageCollector,name=ParNew/CollectionTime
  • /java.lang:type=GarbageCollector,name=ParNew/CollectionCount

measurement = javaMemory

  • /java.lang:type=Memory/HeapMemoryUsage
  • /java.lang:type=Memory/NonHeapMemoryUsage

measurement = cassandraCache

  • /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Hits
  • /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Requests
  • /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Entries
  • /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Size
  • /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity
  • /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Hits
  • /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Requests
  • /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Entries
  • /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Size
  • /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Capacity

measurement = cassandraClient

  • /org.apache.cassandra.metrics:type=Client,name=connectedNativeClients

measurement = cassandraClientRequest

  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=TotalLatency
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=TotalLatency
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Latency
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Latency
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Timeouts
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Timeouts
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Unavailables
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Unavailables
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Failures
  • /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Failures

measurement = cassandraCommitLog

  • /org.apache.cassandra.metrics:type=CommitLog,name=PendingTasks
  • /org.apache.cassandra.metrics:type=CommitLog,name=TotalCommitLogSize

measurement = cassandraCompaction

  • /org.apache.cassandra.metrics:type=Compaction,name=CompletedTasks
  • /org.apache.cassandra.metrics:type=Compaction,name=PendingTasks
  • /org.apache.cassandra.metrics:type=Compaction,name=TotalCompactionsCompleted
  • /org.apache.cassandra.metrics:type=Compaction,name=BytesCompacted

measurement = cassandraStorage

  • /org.apache.cassandra.metrics:type=Storage,name=Load
  • /org.apache.cassandra.metrics:type=Storage,name=Exceptions

measurement = cassandraTable

Using wildcards for "keyspace" and "scope" can create a lot of series as metrics will be reported for every table and keyspace including internal system tables. Specify a keyspace name and/or a table name to limit them.

  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=LiveDiskSpaceUsed
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=TotalDiskSpaceUsed
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=ReadLatency
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=CoordinatorReadLatency
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=WriteLatency
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=ReadTotalLatency
  • /org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=WriteTotalLatency

measurement = cassandraThreadPools

  • /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=CompactionExecutor,name=ActiveTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=AntiEntropyStage,name=ActiveTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=PendingTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=CurrentlyBlockedTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=PendingTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=CurrentlyBlockedTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=PendingTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=CurrentlyBlockedTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=PendingTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=CurrentlyBlockedTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=PendingTasks
  • /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=CurrentlyBlockedTasks