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Apache Cassandra

Connection Parameters

Name
Required?
Description

Host

Required

The Cassandra host to connect to.

JMX Port

The port for JMX communication to the Cassandra host.

JMX Username

JMX Password

Metrics

Cluster

Name
Description

Activity Count

Total number of read, write, gossip, and compaction tasks

Host

The host used to first connect to the cluster

Node Count

Node Count

Keyspace

Name
Description

Keyspace Name

The name of the keyspace

Node

Name
Description

Active Anti Entropy Stage Tasks

Active tasks for repairing consistency

Active Cache Cleanups

Active tasks to clear the cache

Active Compaction Executor Tasks

Active Counter Mutation Stage Tasks

Active Gossip Stage Tasks

Active tasks sharing knowledge of node state

Active Internal Response Stage Tasks

Active tasks responding to non-client initiated messages, including bootstrapping and schema checking

Active Memtable Flush Writer Tasks

Active writes of memtable contents to disk

Active Memtable Post Flush Tasks

Active post flush operations, like discarding commit log files and flushing secondary indexes

Active Memtable Reclaim Memory Tasks (Seconds)

Active tasks to make unused memory available

Active Migration Stage Tasks

Active changes to the schema

Active Misc Stage Tasks

Active miscellaneous operations, including snapshotting or replicating data after a node has been removed

Active Mutation Stage Tasks

Active local writes

Active Native Transport Requests

Active requests to the server using the CQL Native Protocol

Active Pending Range Calculator Tasks

Active calculations of pending rangers per bootstraps and departed nodes

Active Read Repair Stage Tasks

Active check for and repair of damaged replicas

Active Read Stage Tasks

Active local reads

Active Request Response Stage Tasks

Active tasks to handle responses from other nodes

Active Validation Executor Tasks

Active schema validations

Active View Mutation Stage Tasks

Active mutations applied to a view after modifications to a base table

Available Processors

Number of available processors

Batch Size Failure Threshold (Kibibytes)

The maximum size a batch may yield before aborting

CAS Contention Timeout (Milliseconds)

Amount of time to wait for contention resolution for lightweight transactions

CAS Read Condition Not Met

Number of transaction preconditions that did not match current values during read

CAS Read Contention

Number of lightweight transaction reads that were contended

CAS Read Failures

Lightweight transaction reads that failed

CAS Read Latency (Microseconds)

Average duration of CAS Read events

CAS Read Latency Event Count (Microseconds)

CAS Read Timeouts

Number of lightweight transaction reads that timed out

CAS Read Total Latency (Microseconds)

Time spent in CAS Read events since process start

CAS Read Unavailables

Number of lightweight transaction reads that failed because too many replicas were unavailable

CAS Read Unfinished Commit

Number of lightweight transactions that were committed on read

CAS Write Condition Not Met

Number of lightweight transaction writes where preconditions did not match current values

CAS Write Contention

Number of lightweight transaction writes that were contended

CAS Write Failures

Number of lightweight transaction writes that failed

CAS Write Latency (Microseconds)

Average duration of CAS Write events

CAS Write Latency Event Count (Microseconds)

Number of CAS Write events since process start

CAS Write Timeouts

Number of lightweight transaction writes that timed out

CAS Write Total Latency (Microseconds)

Time spent in CAS Write events since process start

CAS Write Unavailables

Number of lightweight transaction writes that failed because too many nodes were unavailable

CAS Write Unfinished Commit

Number of transactions that were committed on write

Chunk Cache Capacity (Bytes)

Chunk Cache Entries

Total number of chunk cache entries

Chunk Cache Misses

Total number of chunk cache misses

Chunk Cache Requests

Total number of chunk cache requests

Chunk Cache Size (Bytes)

Total size of occupied chunk cache

Committed Heap Memory (Bytes)

Amount of heap memory committed for the JVM

Committed Non-Heap Memory (Bytes)

Amount of non-heap memory committed for the JVM

Committed Virtual Memory Size (Bytes)

Compaction Throughput (Mebibytes per Second)

Throttles compaction to the specified total throughput across the node

Completed Anti Entropy Stage Tasks

Completed tasks for repairing consistency

Completed Cache Cleanups

Number of times the cache has been cleared

Completed Compaction Executor Tasks

Completed Counter Mutation Stage Tasks

Completed local counter changes

Completed Gossip Stage Tasks

Completed tasks sharing knowledge of node state

Completed Internal Response Stage Tasks

Completed tasks responding to non-client initiated messages, including bootstrapping and schema checking

Completed Memtable Flush Writer Tasks

Completed writes of memtable contents to disk

Completed Memtable Post Flush Tasks

Completed post flush operations, like discarding commit log files and flushing secondary indexes

Completed Memtable Reclaim Memory Tasks

Completed tasks to make unused memory available

Completed Migration Stage Tasks

Completed changes to the schema

Completed Misc Stage Tasks

Completed miscellaneous operations, including snapshotting or replicating data after a node has been removed

Completed Mutation Stage Tasks

Completed local writes

Completed Native Transport Requests

Completed requests to the server using the CQL Native Protocol

Completed Pending Range Calculator Tasks

Completed calculations of pending rangers per bootstraps and departed nodes

Completed Read Repair Stage Tasks

Completed check for and repair of damaged replicas

Completed Read Stage Tasks

Completed Request Response Stage Tasks

Completed tasks to handle responses from other nodes

Completed Validation Executor Tasks

Completed schema validations

Completed View Mutation Stage Tasks

Completed mutations applied to a view after modifications to a base table

Concurrent Mark Sweep Collection Count

Number of times the old generation has been garbage collected

Concurrent Mark Sweep Collection Time (Milliseconds)

Elapsed time garbage collecting the old generation, or relatively long-lived objects

Counter Cache Capacity

Counter Cache Entries

Counter Cache Hits

Counter Cache Keys to Save

Number of keys that should be saved to disk to quickly warm the counter cache on startup

Counter Cache Requests

Counter Cache Save Period (Seconds)

How often to save counter caches to disk

Counter Cache Size (Bytes)

Total size of occupied counter cache

Counter Write RPC Timeout (Milliseconds)

Timeout for counter updates

Current Generation Number

A value that changes every time the node restarts, faccilitating coordination of data throughout the cluster

Daemon Threads

Current number of live daemon threads

Drain Progress

Progress of drain operations

Free Physical Memory Size (Bytes)

Amount of free memory available to the operating system

Free Swap Space Size (Bytes)

Amount of free swap space

Gossip Running

Whether gossip is running

Hinted Handoff Enabled

A hint indicates that a write needs to be replayed to an unavailable node

Incremental Backups Enabled

Backs up data updated since the last snapshot was taken

Index Info Count

Number of on-heap index entries

Index Info Gets

Number of index seeks

Indexed Entry Size (Bytes)

On-heap index size

Initial Heap Memory (Bytes)

Amount of heap memory that the JVM initially requests from the operating system

Initial Non-Heap Memory (Bytes)

Amount of non-heap memory that the JVM initially requests from the operating system

Initialized

Whether the node is successfully initialized

Inter DC Stream Throughput (Megabits per Second)

Throttles all streaming file transfer between the datacenters

Internal IP Address

The IP used for communication within the Cassandra cluster

Java Version

Java Version

Joined

Whether or not the node has joined the cluster

JVM Implementation

JVM implementation name

Key Cache Capacity (Bytes)

Key cache capacity in bytes

Key Cache Entries

Total number of key cache entries

Key Cache Hits

Total number of key cache hits

Key Cache Keys to Save

Number of keys that should be saved to disk to quickly warm the key cache on startup

Key Cache Requests

Total number of key cache requests

Key Cache Save Period (Seconds)

How often to save key caches to disk

Key Cache Size (Bytes)

Total size of occupied key cache

Load String

Human-readable load value

Maximum File Descriptors

Maximum number of open file descriptors allowed by the operating system

Maximum Heap Memory (Bytes)

Maximum amount of heap memory that could be committed for the JVM

Maximum Hint Window (Milliseconds)

Maximum amount of time that hints are generated for an unresponsive node

Maximum Non-Heap Memory (Bytes)

Maximum amount of non-heap memory that could be committed for the JVM

Native Transport Maximum Concurrent Connections

Maximum number of concurrent client connections

Native Transport Running

Whether or not the native protocol server is running

Objects Pending Finalization

Number of objects queued for finalization, where their memory usage will be reclaimed

Open File Descriptors

Current number of open file descriptors

Operating System

Name of the operating system

Operating System Architecture

Hardware architecture

Operating System Version

Version of the operating system

Operation Mode

Operational mode (leaving, joining, normal, decommissioned, client)

ParNew (Stop the World) Collection Count

Number of times the new generation has been garbage collected

ParNew (Stop the World) Collection Time (Milliseconds)

Elapsed time garbage collecting the new generation, or relatively short-lived objects

Pending Anti Entropy Stage Tasks

Pending tasks for repairing consistency

Pending Cache Cleanups

Pending tasks to clear the cache

Pending Compaction Executor Tasks

Pending compactions

Pending Counter Mutation Stage Tasks

Pending local counter changes

Pending Gossip Stage Tasks

Pending tasks sharing knowledge of node state

Pending Internal Response Stage Tasks

Pending tasks responding to non-client initiated messages, including bootstrapping and schema checking

Pending Memtable Flush Writer Tasks

Pending writes of memtable contents to disk

Pending Memtable Post Flush Tasks

Pending post flush operations, like discarding commit log files and flushing secondary indexes

Pending Memtable Reclaim Memory Tasks

Pending tasks to make unused memory available

Pending Migration Stage Tasks

Pending changes to the schema

Pending Misc Stage Tasks

Pending miscellaneous operations, including snapshotting or replicating data after a node has been removed

Pending Mutation Stage Tasks

Pending local writes

Pending Native Transport Requests

Queued requests to the server using the CQL Native Protocol

Pending Pending Range Calculator Tasks

Pending calculations of pending rangers per bootstraps and departed nodes

Pending Read Repair Stage Tasks

Pending check for and repair of damaged replicas

Pending Read Stage Tasks

Pending local reads

Pending Request Response Stage Tasks

Pending tasks to handle responses from other nodes

Pending Validation Executor Tasks

Pending schema validations

Pending View Mutation Stage Tasks

Pending mutations applied to a view after modifications to a base table

Prepared Statements

Number of prepared statements

Prepared Statements Evicted

Number of prepared statements that have been evicted to save space for other prepared statements

Prepared Statements Executed

Number of prepared statements executed

Process CPU Load

Process CPU Load

Process CPU Time (Nanoseconds)

Amount of time used by the process

Range RPC Timeout (Milliseconds)

Timeout for range requests, which may take longer

Range Slice Failures

Number of token range read requests that failed

Range Slice Latency (Microseconds)

Average duration of Range Slice events

Range Slice Latency Event Count (Microseconds)

Number of Range Slice events since process start

Range Slice Timeouts

Number of token range read requests that timed out

Range Slice Total Latency (Microseconds)

Time spent in Range Slice events since process start

Range Slice Unavailables

Number of token range read requests that failed because too many nodes were unavailable

Read Failures

Reads that failed

Read Latency (Microseconds)

Average duration of Read events

Read Latency Event Count (Microseconds)

Number of Read events since process start

Read RPC Timeout (Milliseconds)

Timeout for reads

Read Timeouts

Reads that timed out

Read Total Latency (Microseconds)

Time spent in Read events since process start

Read Unavailables

Reads that failed because too many nodes were unavailable

Regular Statements Executed

Number of regular (non-prepared) statements executed

Release Version

Version of Cassandra

Removal Status

Status of token removals

Row Cache Capacity (Bytes)

Row cache capacity

Row Cache Entries

Total number of row cache entries

Row Cache Hits

Total number of row cache hits

Row Cache Keys to Save

Number of keys that should be saved to disk to quickly warm the row cache on startup

Row Cache Requests

Total number of row cache requests

Row Cache Save Period (Seconds)

How often to save row caches to disk

Row Cache Size (Bytes)

Total size of occupied row cache

RPC Server Running

Whether or not the Thrift (RPC) server is running

RPC Timeout (Milliseconds)

Overall timeout for all requests

Schema Version

Identifier for the current version of the schema, for comparison purposes

Started Threads

Total number of threads created and also started since the Java virtual machine started

Starting

Whether the node is starting

Storage Exceptions

Number of internal exceptions caught

Storage Load (Bytes)

Size of the on disk data size this node manages

Storage Total Hints

Number of hint messages written to this node since restart

Stream Throughput (Megabits per Second)

Throttles all outbound streaming file transfers on a node to the specified throughput

Streaming Socket Timeout (Milliseconds)

How long to wait before timing out a stream and retrying it from the start of the current file

System CPU Load

System CPU Load

System Load Average

System load average

Threads

Current number of live threads including both daemon and non-daemon threads

Tombstone Failure Threshold

The maximum number of tombstones a query can scan before aborting

Tombstone Warn Threshold

The maximum number of tombstones a query can scan before warning

Total Hints in Progress

Number of hints attemping to be sent currently

Total Physical Memory Size (Bytes)

Amount of memory available to the operating system

Total Swap Space Size (Bytes)

Amount of swap space allocated

Truncate RPC Timeout (Milliseconds)

Timeout for truncate requests, which generally take longer than other requests because of flushing requirements

Uptime (Milliseconds)

Time since Cassandra last started

Used Heap Memory (Bytes)

Amount of heap memory in use

Used Non-Heap Memory (Bytes)

Amount of non-heap memory in use

View Pending Mutations

View mutations that have been attempted but have not yet succeeded

View Replicas Attempted

Number of attempted view replications

View Replicas Succeeded

Number of successful view replications

View Write Failures

View writes that failed

View Write Latency (Microseconds)

Average duration of View Write events

View Write Latency Event Count (Microseconds)

Number of View Write events since process start

View Write Timeouts

Timeouts when writing to materialized views

View Write Total Latency (Microseconds)

Time spent in View Write events since process start

View Write Unavailables

View writes that failed because too many replicas were unavailable

Virtual Machine Version

JVM Implementation Version

Write Failures

Writes that have failed

Write Latency (Microseconds)

Average duration of Write events

Write Latency Event Count (Microseconds)

Number of Write events since process start

Write RPC Timeout (Milliseconds)

Timeout for writes

Write Timeouts

Writes that have timed out

Write Total Latency (Microseconds)

Time spent in Write events since process start

Write Unavailables

Writes that failed because too many replicas were unavailable

Node Keyspace

Name
Description

All Memtables Live Data Size (Bytes)

amount of live data stored in the memtables (2i and pending flush memtables included), excluding any data structure overhead

All Memtables Off Heap Data Size (Bytes)

Amount of data stored in the memtables (2i and pending flush memtables included) that resides off-heap

All Memtables On Heap Data Size (Bytes)

Amount of data stored in the memtables (2i and pending flush memtables included) that resides on-heap

Bloom Filter Disk Space Used (Bytes)

Disk space used by bloom filter

Bloom Filter Off Heap Memory Used (Bytes)

Amount of off heap memory used for Bloom filters for this table

CAS Commit Latency (Microseconds)

Average duration of CAS Commit events

CAS Commit Latency Event Count (Microseconds)

Number of CAS Commit events since process start

CAS Commit Total Latency (Microseconds)

Time spent in CAS Commit events since process start

CAS Prepare Latency (Microseconds)

Average duration of CAS Prepare events

CAS Prepare Latency Event Count (Microseconds)

Number of CAS Prepare events since process start

CAS Prepare Total Latency (Microseconds)

Time spent in CAS Prepare events since process start

CAS Propose Latency (Microseconds)

Average duration of CAS Propose events

CAS Propose Latency Event Count (Microseconds)

Number of CAS Propose events since process start

CAS Propose Total Latency (Microseconds)

Time spent in CAS Propose events since process start

Compression Metadata Off Heap Memory Used (Bytes)

The amount of off heap memory used for compression offset maps for this keyspace

Index Summary Off Heap Memory Used (Bytes)

Amount of off heap memory used for index summaries for this keyspace

Internal IP Address

The IP used for communication within the Cassandra cluster

Keyspace Name

Name of the keyspace

Live Disk Space Used (Bytes)

Disk space used by SSTables belonging to this keyspace

Live Scanned

Live cells scanned in queries on this keyspace

Memtable Columns Count

Number of columns present in the memtable

Memtable Live Data Size (Bytes)

Amount of live data stored in the memtable, excluding any data structure overhead

Memtable Off Heap Data Size (Bytes)

Amount of data stored in the memtable that resides off-heap, including column related overhead and partitions overwritten

Memtable On Heap Data Size (Bytes)

Amount of data stored in memtables that resides on-heap, including column related overhead and partitions overwritten

Memtable Switch Count

Number of times flush has resulted in the memtable being switched out

Pending Compactions

Number of pending compactions for this keyspace

Pending Flushes

Number of flush tasks pending for this keyspace

Range Latency (Microseconds)

Average duration of Range events

Range Latency Event Count (Microseconds)

Number of Range events since process start

Range Total Latency (Microseconds)

Time spent in Range events since process start

Read Latency (Microseconds)

Average duration of Read events

Read Latency Event Count (Microseconds)

Number of Read events since process start

Read Total Latency (Microseconds)

Time spent in Read events since process start

SSTables Per Read

Number of sstable data files accessed per read

Tombstone Scanned

Tombstones scanned in queries on this Keyspace

Total Disk Space Used (Bytes)

Total disk space used by SSTables belonging to this keyspace including obsolete ones waiting to be garbage collected

Write Latency (Microseconds)

Average duration of Write events

Write Latency Event Count (Microseconds)

Number of Write events since process start

Write Total Latency (Microseconds)

Time spent in Write events since process start

Node Table

Name
Description

All Memtables Heap Size (Bytes)

Total amount of data stored in the memtables (2i and pending flush memtables included) that resides on-heap

All Memtables Live Data Size (Bytes)

Total amount of live data stored in the memtables (2i and pending flush memtables included) that resides off-heap, excluding any data structure overhead

All Memtables Off Heap Size (Bytes)

Total amount of data stored in the memtables (2i and pending flush memtables included) that resides off-heap

Auto Compaction Disabled

Whether or not automatic compaction has been disabled

Bloom Filter Disk Space Used (Bytes)

Disk space used by bloom filter

Bloom Filter False Positive Ratio

False positive ratio of bloom filter

Bloom Filter False Positives

Number of false positives in bloom filter

Bloom Filter Off Heap Memory Used (Bytes)

Off heap memory used by bloom filter

CAS Commit Latency (Microseconds)

Average duration of CAS Commit events

CAS Commit Latency Event Count (Microseconds)

Number of CAS Commit events since process start

CAS Commit Total Latency (Microseconds)

Time spent in CAS Commit events since process start

CAS Prepare Latency (Microseconds)

Average duration of CAS Prepare events

CAS Prepare Latency Event Count (Microseconds)

Number of CAS Prepare events since process start

CAS Prepare Total Latency (Microseconds)

Time spent in CAS Prepare events since process start

CAS Propose Latency (Microseconds)

Average duration of CAS Propose events

CAS Propose Latency Event Count (Microseconds)

Number of CAS Propose events since process start

CAS Propose Total Latency (Microseconds)

Time spent in CAS Propose events since process start

Compaction Data Written (Bytes)

Compaction Data Written

Compression Metadata Off Heap Memory Used (Bytes)

Off heap memory used by compression meta data

Compression Ratio

Current compression ratio for all SSTables

CRC Check Chance

Defines the probability with which checksums are checked during read to ensure compressed data has not suffered bitrot or corruption

Data Flushed (Bytes)

Data Flushed

Droppable Tombstone Ratio

Ratio of tombstones that can safely be dropped

Estimated Partition Count

Estimated Partition Count

Index Summary Off Heap Memory Used (Bytes)

Off heap memory used by index summary

Internal IP Address

The IP used for communication within the Cassandra cluster

Key Cache Hit Rate (per Second)

Key Cache Hit Rate

Keyspace Name

Name of the keyspace

Live Disk Space Used (Bytes)

Disk space used by SSTables belonging to this column family

Live Scanned

Live cells scanned in queries

Live SSTable Count

Live SSTable Count

Maximum Compaction Threshold

Maximum number of SSTables to allow in a minor compaction when using SizeTieredCompactionStrategy or DateTieredCompactionStrategy

Maximum Partition Size (Bytes)

Maximum Partition Size

Mean Partition Size (Bytes)

Mean Partition Size

Memtable Columns Count

Memtable Columns Count

Memtable Live Data Size (Bytes)

Total amount of live data stored in the memtable, excluding any data structure overhead

Memtable Off Heap Size (Bytes)

Total amount of data stored in the memtable that resides off-heap, including column related overhead and overwritten rows

Memtable On Heap Size (Bytes)

Total amount of data stored in the memtable that resides on-heap, including column related overhead and overwritten rows

Memtable Switch Count

Number of times flush has resulted in the memtable being switched out

Minimum Compaction Threshold

Minimum number of SSTables to trigger a minor compaction when using SizeTieredCompactionStrategy or DateTieredCompactionStrategy

Minimum Partition Size (Bytes)

Minimum Partition Size

Pending Compactions

Estimate of number of pending compactions

Range Latency (Microseconds)

Average duration of Range events

Range Latency Event Count (Microseconds)

Number of Range events since process start

Range Total Latency (Microseconds)

Time spent in Range events since process start

Read Latency (Microseconds)

Average duration of Read events

Read Latency Event Count (Microseconds)

Number of Read events since process start

Read Total Latency (Microseconds)

Time spent in Read events since process start

Row Cache Hit

Number of row cache hits

Row Cache Hit Out Of Range

Row cache hits, but result out of range

Row Cache Miss

Number of row cache misses

Speculative Retries

Speculative Retries

Table Name

Name of the table

Tombstones Scanned

Tombstones scanned in queries

Total Disk Space Used (Bytes)

Total disk space used by SSTables belonging to this CF, including obsolete ones waiting to be GC'd

Unleveled SSTables

Unleveled SSTables

Write Latency (Microseconds)

Average duration of Write events

Write Latency Event Count (Microseconds)

Number of Write events since process start

Write Total Latency (Microseconds)

Time spent in Write events since process start

Table

Name
Description

Keyspace Name

The name of the table's keyspace

Table Name

The name of the table