126 lines
6.6 KiB
Markdown
126 lines
6.6 KiB
Markdown
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# Telegraf plugin: Cassandra
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#### Plugin arguments:
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- **context** string: Context root used for jolokia url
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- **servers** []string: List of servers with the format "<user:passwd@><host>:port"
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- **metrics** []string: List of Jmx paths that identify mbeans attributes
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#### Description
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The Cassandra plugin collects Cassandra/JVM metrics exposed as MBean's attributes through jolokia REST endpoint. All metrics are collected for each server configured.
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See: https://jolokia.org/ and [Cassandra Documentation](http://docs.datastax.com/en/cassandra/3.x/cassandra/operations/monitoringCassandraTOC.html)
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# Measurements:
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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.
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Given a configuration like:
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```toml
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[[inputs.cassandra]]
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context = "/jolokia/read"
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servers = [":8778"]
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metrics = ["/java.lang:type=Memory/HeapMemoryUsage"]
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```
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The collected metrics will be:
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```
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javaMemory,host=myHost,mname=HeapMemoryUsage HeapMemoryUsage_committed=1040187392,HeapMemoryUsage_init=1050673152,HeapMemoryUsage_max=1040187392,HeapMemoryUsage_used=368155000 1459551767230567084
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```
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# Useful Metrics:
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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.
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- [How to monitor Cassandra performance metrics](https://www.datadoghq.com/blog/how-to-monitor-cassandra-performance-metrics)
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- [Cassandra Documentation](http://docs.datastax.com/en/cassandra/3.x/cassandra/operations/monitoringCassandraTOC.html)
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####measurement = javaGarbageCollector
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- /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionTime
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- /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionCount
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- /java.lang:type=GarbageCollector,name=ParNew/CollectionTime
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- /java.lang:type=GarbageCollector,name=ParNew/CollectionCount
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####measurement = javaMemory
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- /java.lang:type=Memory/HeapMemoryUsage
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- /java.lang:type=Memory/NonHeapMemoryUsage
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####measurement = cassandraCache
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- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Hit
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- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Requests
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- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Entries
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- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Size
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- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity
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- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Hit
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- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Requests
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- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Entries
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- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Size
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- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Capacity
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####measurement = cassandraClient
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- /org.apache.cassandra.metrics:type=Client,name=connectedNativeClients
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####measurement = cassandraClientRequest
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=TotalLatency
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=TotalLatency
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Latency
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Latency
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Timeouts
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Timeouts
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Unavailables
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Unavailables
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Failures
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- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Failures
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####measurement = cassandraCommitLog
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- /org.apache.cassandra.metrics:type=CommitLog,name=PendingTasks
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- /org.apache.cassandra.metrics:type=CommitLog,name=TotalCommitLogSize
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####measurement = cassandraCompaction
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- /org.apache.cassandra.metrics:type=Compaction,name=CompletedTask
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- /org.apache.cassandra.metrics:type=Compaction,name=PendingTasks
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- /org.apache.cassandra.metrics:type=Compaction,name=TotalCompactionsCompleted
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- /org.apache.cassandra.metrics:type=Compaction,name=BytesCompacted
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####measurement = cassandraStorage
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- /org.apache.cassandra.metrics:type=Storage,name=Load
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- /org.apache.cassandra.metrics:type=Storage,name=Exceptions
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####measurement = cassandraTable
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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.
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=LiveDiskSpaceUsed
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=TotalDiskSpaceUsed
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=ReadLatency
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=CoordinatorReadLatency
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=WriteLatency
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=ReadTotalLatency
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- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=WriteTotalLatency
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####measurement = cassandraThreadPools
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- /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=CompactionExecutor,name=ActiveTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=AntiEntropyStage,name=ActiveTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=PendingTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=CurrentlyBlockedTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=PendingTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=CurrentlyBlockedTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=PendingTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=CurrentlyBlockedTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=PendingTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=CurrentlyBlockedTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=PendingTasks
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- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=CurrentlyBlockedTasks
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