Apache Cassandra Monitoring

Overview

Applications Manager provides out-of-the-box performance metrics and helps you visualize the health and availability of your Apache Cassandra NoSQL database.

Creating a new Cassandra DB monitor

Supported Versions: Apache Cassandra 2.0 and above.

Prerequisite:Click here to know about the necessary prerequisites to monitor Apache Cassandra database.

Using the REST API to add a new Cassandra monitor:Click here

To create a Cassandra database server monitor, follow the steps given below:

1. Click on New Monitor link.
2. Select Cassandra.
3. Specify the Display Name of the Cassandra monitor
4. Enter the HostName or IP Address of the host where Cassandra server runs
5. Enter the JMX Port where the server is running. By default, it will be 7199 or else check in cassandra-env.sh file for the JMX_PORT.
6. If you want to discover only this node, disable the option Discover all nodes in the Cluster. By default, it is enabled which means all the nodes in the cluster are discovered by default
7. Check the Is Authentication Required field, to give the JMX credentials to be used to connect to the Cassandra server. Now enter the UserName and Password of the credential
8. Specify the Polling Interval in minutes
9. If you are adding a new monitor from the Central Server, select a Probe Server.
10. Choose the Monitor Group with which you want to associate the Cassandra server to, from the combo box (optional). You can choose multiple groups to associate your monitor
11. Click Add Monitor(s). This discovers the Cassandra server from the network and starts monitoring it

Note:
In case you are unable to add the monitor even after enabling JMX, try providing the below argument:
 -Djava.rmi.server.hostname=[YOUR_IP]

Monitored Parameters

Click on the individual monitors listed to view the following information in the below tabs:

• Monitor Information
• Performance
• Pending Tasks
• Cluster Stats
• Messages
• Configurations

Monitor Information

This tab displays the basic information like the name of the server, host name and the JMX port where the server is running. Additional parameters like Token, Gossip Active, Load, Generation No, Uptime, DataCenter, Rack Name are also displayed. These are the equivalent of the Nodetool result got using the command 'nodetool.bat/sh -h -p info'

Performance

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
Availability and Performance History	Displays the availability and performance history for the last six hours.
CPU Usage	Specifies the usage of CPU in percentage.
Memory Utilization	Specifies the used, free and total memory of the server in mega bytes
Exceptions	Count of various exceptions such as not found, invalid, unavailable, timed out, etc.
Storage Stats	Specifies the storage load in GB.
Operation Stats	Number of range, read and write operations per second since executor start.
Operation Latency	The latency of range, read and write operations since the last time the attribute was read.
Bloom Filter Statistics
Bloom Filter False Positives	Number of false positives (Occurs when the bloom filter says a non-existential row exists)
Bloom Filter False Positive Ratio	Fraction of all bloom filter checks resulting in a false positive
Bloom Filter Disk Space Used	The size of the bloom filter files on disk
Memtable Statistics
Memtable Columns Count	Total number of columns present in memtable
Memtable Data Size	Amount of data stored in memtable, including column-related overhead
Memtable Switch Count	Number of times flushing results in the memtable being switched out
Client Details
Connected Native Clients	Number of Native Clients currently connected to the server instance
Connected Thrift Clients	Number of Thrift Clients currently connected to the server instance
Average Operational Latency
Average Range Latency	The average latency per range operation since the last poll
Average Read Latency	The average latency per read operation since the last poll
Average Write Latency	The average latency per write operation since the last poll
Operational Timeouts
Recent Timeouts	Number of read, write and range slice operation timeouts since the last poll

Pending Tasks

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
COMMITLOG/COMPACTION - PENDING TASKS
Commitlog - Pending Tasks	Number of Commitlog tasks waiting in the queue to be executed.
Compaction - Pending Tasks	Number of Compaction tasks waiting in the queue to be executed.
COMMANDS/RESPONSES - PENDING TASKS
Commands - Pending Tasks	Number of Command tasks waiting in the queue to be executed.
Responses - Pending Tasks	Number of Response tasks waiting in the queue to be executed.
Task Statistics of Thread Pools	Status of various stages of thread pools like active and pending tasks, completed and blocked tasks are being displayed. These are equivalent of the Nodetool result got using the command 'nodetool.bat/sh -h <hostname> -p <portnumber> tpstats'.

Cluster Stats

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
Cluster Details	Specifies details on live, leaving, moving, joining and unreachable nodes.
Cluster Node Details	Health status and storage load (in GB) of the nodes in the cluster.

Messages

This tab contains the Dropped Message and Message Timeout statistics:

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
Recent Total Timeouts	Number of timeouts since last poll

Configurations

This tab contains the configuration values of files that are part of cassandra.yaml config file.

The following metrics and descriptions are grouped by section and include version-based availability.

Configuration details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
Load	Total size of the node's data on disk (including all keyspaces).
Generation No	Timestamp or generation number used for identifying commit logs.
DataCenter Name	Name of the datacenter this Cassandra node belongs to.
Rack Name	Name of the rack in which the node resides, used for network topology awareness.
Compaction Throughput MB Per Second	Maximum throughput allowed for compaction operations.
Stream Throughput MB Per Second	Maximum throughput for streaming data during operations like bootstrap or repair.
RPC Timeout in millisecond	Timeout for Remote Procedure Call (RPC) requests in milliseconds.
Max Hint Window in millisecond	Time window during which hints are stored for unavailable replicas.
MaxHints In Progress	Maximum number of hint delivery processes allowed to run simultaneously.
Minimum Compaction Threshold	Minimum number of SSTables that must be eligible to trigger compaction.
Maximum Compaction Threshold	Maximum number of SSTables allowed to be compacted together.
Key Cache Save Period In Seconds	Time interval in seconds for saving the key cache to disk.
Row Cache Save Period In Seconds	Time interval in seconds for saving the row cache to disk.
Row Cache Keys To Save	Number of keys to retain when saving the row cache.
Storage Initialized	Indicates if storage services have been initialized on the node.
RPC Server Running	Indicates whether the RPC server is currently running.
All Data File Locations	Directories where Cassandra stores data files.
Commit Log Location	Directory where commit logs are stored.
Saved Caches Locations	Directory where saved caches are written.
Joined in cluster	Indicates if the node has joined the Cassandra cluster.
Release Version	The version of Cassandra running on the node.
Operation Mode	Current operational mode of the node (e.g., NORMAL, JOINING, LEAVING).
Removal Status	Status of node removal from the cluster, if applicable.
Drain Progress	Progress of the drain operation (flushing memtables before shutdown).
Hinted Handoff Enabled	Indicates whether hinted handoff is enabled for the node.
Compaction Strategy Class	The class defining the strategy used for SSTable compaction.
EndpointSnitch - Badness Threshold	Threshold for accepting suboptimal replicas based on latency.
EndpointSnitch - Reset Interval in milliseconds	Interval to reset snitch decisions and latency scores.
EndpointSnitch - Update Interval in milliseconds	Frequency at which snitch updates node latencies.
EndpointSnitch - ClassName	The Java class name of the endpoint snitch in use.

Database details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
DATABASE CACHE DETAILS
Counter Cache Save Period	The frequency with which the counter cache is saved to disk.
Key Cache Hits	Number of table key cache hits.
Key Cache Requests	Total number of key cache requests.
Key Cache Recent Hit Rate	All time key cache hit rate
Key Cache Save Period	Indicates how frequently the system saves or persists the contents of this key cache to a more permanent storage medium, such as disk or memory
Key Cache Capacity	Key Cache capacity
Key Cache Size	Total size of occupied key cache,
Key Cache Entries	Total number of key cache entries.
Row Cache Hits	Number of table row cache hits.
Row Cache Requests	Total number of row cache requests.
Row Cache Save Period	Indicates how frequently the system saves or persists the contents of this row cache to a more permanent storage medium, such as disk or memory
Row Cache Capacity	Row Cache capacity
Row Cache Size	Total size of occupied row cache,
Row Cache Entries	Total number of row cache entries.
DATABASE DYNAMIC ENDPOINT SNITCH DETAILS
Dynamic EndpointSnitch Severity	A measure of the severity of latency and instability between Cassandra nodes
Dynamic EndpointSnitch Update Interval	Indicates the frequency at which the Dynamic EndpointSnitch updates its penalties assigned to individual nodes
Dynamic EndpointSnitch Reset Interval	The time interval after which the Dynamic EndpointSnitch clears its penalty history for individual nodes.
DATABASE STORAGE PROXY DETAILS
Storage Proxy Hints in Progress	Number of hints attemping to be sent currently
Storage Proxy Range Operations	the number of range operations performed
Storage Proxy Read Operations	The number of read operations handled
Storage Proxy Read repair attempted	the number of times the storage proxy component has initiated read repair operations.
Storage Proxy Read Repair Repaired Background	the number of successful background read repair operations completed
Storage Proxy Read Repair Repaired Blocking	the number of successful read repair operations completed
Storage Proxy Recent Range Latency Micros	the recent latency of range operations handled
Storage Proxy Recent Read Latency Micros	the recent latency of read operations handled
Storage Proxy Rpc Timeout	the duration it takes for a RPC initiated by the storage proxy to time out
Storage Proxy Total Hints	Number of hint messages written to this node since [re]start. Includes one entry for each host to be hinted per hint.
Storage Proxy Total Read Latency Micros	the total latency of read operations handled
Storage Proxy Total Range Latency Micros	the total latency of read operations handled
Storage Proxy Total Write Latency Micros	the total latency of write operations handled
Storage Proxy Truncate RPC Timeout	the duration it takes for a truncate operation initiated by the storage proxy to time out
Storage Proxy Write Operations	the number of write operations handled
Storage Proxy Write Rpc Timeout	the duration it takes for a RPC initiated by the storage proxy to time out during write operations
Storage Proxy Cas Contention Timeout	the duration it takes for a CAS operation initiated by the storage proxy to time out due to contention.
Storage Proxy Counter Write Rpc Timeout	the duration it takes for a RPC initiated by the storage proxy to time out during counter write operations
DATABASE COMPACTION MANAGER DETAILS
Compaction Manager Completed Tasks	Number of completed compactions since server [re]start.
Compaction Manager Pending Tasks	Estimated number of compactions remaining to perform.
Compaction Manager Total Bytes Compacted	Total number of bytes compacted since server [re]start.
Compaction Manager Total Compaction Completed	Throughput of completed compactions since server [re]start.
Compaction Manager Core Compactor Threads	number of threads dedicated to handling compaction tasks within the compaction manager core.
Compaction Manager Maximum Compactor Threads	maximum number of threads that can be allocated for handling compaction tasks
Compaction Manager Core Validation Threads	number of threads dedicated to performing validation tasks within the compaction manager core.
DATABASE INDEX SUMMARIES DETAILS
Index Summaries Average Index Interval	average distance between consecutive index summary entries within an SSTable
Index Summaries Memory Pool Capacity	maximum amount of memory allocated for storing index summaries
Index Summaries Resize Interval	the frequency at which index summaries are resized or updated within an SSTable

Internal Details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
ANTI ENTROPY STAGE
Anti Entropy Stage Active Count	number of active anti-entropy repair sessions currently in progress within the system.
Anti Entropy Stage Pending Tasks	the number of pending anti-entropy repair tasks that are awaiting execution within the system
Anti Entropy Stage Blocked Tasks	the number of anti-entropy repair tasks that are currently blocked or unable to proceed due to resource constraints
Anti Entropy Stage Currently Blocked Tasks	count of the anti-entropy repair tasks that are presently blocked or unable to proceed
COMMIT LOG ARCHIVER
CommitLog Archiver Active Count	the number of active threads currently engaged in archiving commit log segments
CommitLog Archiver Pending Tasks	Number of commit log messages written but yet to be fsync’d.
CommitLog Archiver Blocked Tasks	the number of tasks in the commit log archiver's queue that are blocked
CommitLog Archiver Currently Blocked Tasks	number of tasks in the commit log archiver's queue that are currently blocked
GOSSIP STAGE
Gossip Stage Active Count	number of active threads currently involved in the gossip stage of the gossip protocol
Gossip Stage Pending Tasks	number of pending tasks in the gossip stage of the gossip protocol that are awaiting execution
Gossip Stage Blocked Tasks	number of tasks in the gossip stage of the gossip protocol that are blocked
Gossip Stage Currently Blocked Tasks	the number of tasks in the gossip stage of the gossip protocol that are currently blocked
INTERNAL RESPONSE STAGE
Internal Response Stage Active Count	the number of active threads currently engaged in processing internal responses within the system
Internal Response Stage Pending Tasks	The number of pending tasks in the internal response processing stage of the system
Internal Response Stage Blocked Tasks	The number of tasks in the internal response processing stage that are blocked
Internal Response Stage Currently Blocked Tasks	he number of tasks in the internal response processing stage that are currently blocked
MEMTABLE POST FLUSH
Memtable Post Flush Active Count	the number of active threads currently involved in post-flush operations after flushing memtables to disk
Memtable Post Flush Pending Tasks	the number of pending tasks in the post-flush stage after memtables have been flushed to disk
Memtable Post Flush Blocked Tasks	the number of tasks in the post-flush stage after memtables have been flushed to disk that are blocked
Memtable Post Flush Currently Blocked Tasks	the number of tasks in the post-flush stage after memtables have been flushed to disk that are blocked
MIGRATION STAGE
Migration Stage Active Count	the number of active threads currently engaged in the migration stage of the system
Migration Stage Pending Tasks	the number of tasks in the post-flush stage after memtables have been flushed to disk that are blocked
Migration Stage Blocked Tasks	number of tasks in the migration stage that are blocked
Migration Stage Currently Blocked Tasks	number of tasks in the migration stage that are currently blocked
PENDING RANGE CALCULATOR
Pending Range Calculator Active Count	the number of active threads currently engaged in the pending range calculation stage
Pending Range Calculator Pending Tasks	the number of pending tasks in the pending range calculation stage
Pending Range Calculator Blocked Tasks	the number of tasks in the pending range calculation stage that are blocked
Pending Range Calculator Currently Blocked Tasks	the number of tasks in the pending range calculation stage that are currently blocked
VALIDATION EXECUTOR DETAIL
Validation Executor Active Count	the number of active threads currently engaged in the validation executor stage
Validation Executor Pending Tasks	the number of validation tasks that are queued up for execution within the validation executor stage
Validation Executor Blocked Tasks	the number of validation tasks that are blocked or unable to proceed within the validation executor stage
Validation Executor Currently Blocked Tasks	the count of tasks within the validation executor stage that are presently obstructed
CACHE CLEANUP EXECUTER
Cache Cleanup Executor Active Count	the number of active threads currently engaged in the cache cleanup executor stage
Cache Cleanup Executor Pending Tasks	the number of pending tasks in the cache cleanup executor stage
Cache Cleanup Executor Blocked Tasks	the number of tasks in the cache cleanup executor stage that are blocked
Cache Cleanup Executor Currently Blocked Tasks	the number of tasks in the cache cleanup executor stage that are currently blocked
COMPACTION EXECUTER
Compaction Executor Active Count	the number of active threads currently engaged in the compaction executor stage
Compaction Executor Pending Tasks	the number of compaction tasks that are queued up for execution within the compaction executor stage
Compaction Executor Blocked Tasks	the number of tasks within the compaction executor stage that are blocked
Compaction Executor Currently Blocked Tasks	the number of tasks within the compaction executor stage that are currently blocked
HINTED HANDOFF
Hinted Handoff Active Count	the number of active threads currently involved in the hinted handoff process
Hinted Handoff Pending Tasks	he number of tasks queued up for processing within the hinted handoff mechanism
Hinted Handoff Blocked Tasks	the number of tasks within the hinted handoff mechanism that are blocked
Hinted Handoff Currently Blocked Tasks	the number of tasks within the hinted handoff mechanism that are currently blocked
MEMTABLE FLUSH WRITER
Memtable Flash Writer Active Count	the number of active threads currently involved in flushing memtables to disk
Memtable Flash Writer Pending Tasks	the number of tasks that are queued up for processing within the memtable flush writer stage
Memtable Flash Writer Blocked Tasks	the number of tasks within the memtable flush writer stage that are blocked
Memtable Flash Writer Currently Blocked Tasks	the number of tasks within the memtable flush writer stage that are currently blocked
MEMTABLE RECLAIM MEMORY
Memtable Reclaim Memory Active Count	the number of active threads currently engaged in the process of reclaiming memory from memtables
Memtable Reclaim Memory Pending Tasks	the number of tasks that are queued up for processing within the memtable memory reclamation stage
Memtable Reclaim Memory Blocked Tasks	the number of tasks within the memtable memory reclamation stage that are blocked
Memtable Reclaim Memory Currently Blocked Tasks	the number of tasks within the memtable memory reclamation stage that are currently blocked
MISC STAGE
Misc Stage Active Count	the number of active threads currently engaged in miscellaneous tasks
Misc Stage Pending Tasks	the number of tasks that are queued up for processing within the miscellaneous stage
Misc Stage Blocked Tasks	the number of tasks within the miscellaneous stage of the system that are blocked
Misc Stage Currently Blocked Tasks	the number of tasks within the miscellaneous stage of the system that are currently blocked
SAMPLER DETAIL
Sampler Active Count	the number of active threads currently engaged in re-sampling the index summaries of SStables
Sampler Pending Tasks	The number of tasks that are currently queued for re-sampling the index summaries of SStables
Sampler Blocked Tasks	the number of tasks within the sampler stage that are blocked
Sampler Currently Blocked Tasks	the number of tasks within the sampler stage that are currently blocked

Request Details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
COUNTER MUTATION STAGE
Counter Mutation Stage Active Count	the number of active threads currently engaged in processing counter mutation writes
Counter Mutation Stage Pending Tasks	the number of pending tasks in the counter mutation stage
Counter Mutation Stage Blocked Tasks	the number of tasks in the counter mutation stage that are blocked
Counter Mutation Stage Currently Blocked Tasks	the number of tasks in the counter mutation stage that are currently blocked
READ REPAIR STAGE
Read Repair Stage Active Count	the number of active read repair tasks currently being executed
Read Repair Stage Pending Tasks	the number of pending read repair tasks in the read repair stage
Read Repair Stage Blocked Tasks	the number of read repair tasks that are blocked
Read Repair Stage Currently Blocked Tasks	the number of read repair tasks that are currently blocked
READ REQUEST RESPONSE STAGE
Request Response Stage Active Count	the number of coordinator requests currently being processed in the request response stage
Request Response Stage Pending Tasks	the number of pending requests in the request response stage
Request Response Stage Blocked Tasks	the number of coordinator requests in the request response stage that are blocked
Request Response Stage Currently Blocked Tasks	the number of coordinator requests in the request response stage that are currently blocked
MUTATION STAGE
Mutation Stage Active Count	the number of active writes currently being processed in the mutation stage
Mutation Stage Pending Tasks	the number of pending writes in the mutation stage
Mutation Stage Blocked Tasks	the number of writes in the mutation stage that are blocked
Mutation Stage Currently Blocked Tasks	the number of writes in the mutation stage that are currently blocked
READ STAGE
Read Stage Active Count	The number of active local reads currently being processed in the read stage
Read Stage Pending Tasks	the number of pending local reads in the read stage
Read Stage Blocked Tasks	The number of local reads within the read stage that are blocked
Read Stage Currently Blocked Tasks	The number of local reads within the read stage that are currently blocked

General details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
CQL DETAILS
CQL Prepared Statements Count	Number of cached prepared statements.
CQL Prepared Statements Ratio	Percentage of statements that are prepared vs unprepared
CQL Prepared Statements Evicted	Number of prepared statements evicted from the prepared statement cache
CQL Prepared Statements Executed	Number of prepared statements executed.
CAS WRITE DETAILS
CAS Write Failure Count	Count of CAS write failures
CAS Write Contention Histogram	A breakdown of the distribution of contention levels for CAS writes
CAS Write Latency	Time taken for CAS write operations to complete
CAS Write Timeouts	The number of CAS write operations that have timed out.
CAS Write TotalLatency	The total latency or cumulative time taken for CAS write operations
CAS Write Unavailables	The number of CAS write operations that were unable to complete due to unavailability of resources or nodes within the cluster.
CAS Write Unfinished Commit	CAS write operation has been initiated but has not completed its commit phase successfully.
READ PERFORMANCE DETAILS
Read Latency	Local read latency for this table.
Read Timeouts	Read timeouts encountered
Read Unavailables	Number of unavailable exceptions encountered
COMMIT LOG DETAILS
Commitlog Completed Tasks	Total number of commit log messages written since [re]start.
Commitlog Size	Current size, in bytes, used by all the commit log segments.
Commitlog Waiting On Commit	The time spent waiting on CL fsync; for Periodic this is only occurs when the sync is lagging its sync interval
Commitlog Waiting On Segment Allocation	Time spent waiting for a CommitLogSegment to be allocated - under normal conditions this should be zero.
DROPPED MESSAGE DETAILS
Dropped Message Binary	Messages dropped by the server during communication with clients or other nodes in the cluster.These dropped messages are specifically in binary format.
Dropped Message Counter Mutation	Dropped counter mutation messages
Dropped Message Mutation	Dropped mutation messages
Dropped Message Paged Range	paged range query initiated by a client is dropped
Dropped Message Range Slice	range slice operation initiated by a client is dropped without receiving a response
Dropped Message Read	read request initiated by a client is dropped without receiving a respons
Dropped Message Read Repair	read repair operation initiated by the system fails to complete successfully.
Dropped Message Request Response	request initiated by a client is dropped
Dropped Message Trace	Information about the messages that have been dropped
CAS READ DETAILS
CAS Read Condition Failure Count	Count of CAS read failures
CAS Read Contention Histogram	A breakdown of the distribution of contention levels for CAS reads
CAS Read Latency	Time taken for CAS read operations to complete
CAS Read Timeouts	The number of CAS read operations that have timed out.
CAS Read TotalLatency	The total latency or cumulative time taken for CAS read operations
CAS Read Unavailables	The number of CAS read operations that were unable to complete due to unavailability of resources or nodes within the cluster.
CAS Read Unfinished Commit	CAS read operation has been initiated but has not completed its commit phase successfully.
RANGE SLICE DETAILS
RangeSlice Latency	Local rangeslice latency for this table.
RangeSlice Timeouts	RangeSlice timeouts encountered
RangeSlice Unavailables	Number of unavailable exceptions encountered
WRITE PERFORMANCE DETAILS
Write Latency	Local write latency for this table.
Write Timeouts	Number of write timeouts occured
Write Unavailables	Number of unavailable exceptions encountered
COMPACTION DETAILS
Compaction Bytes Compacted	Total number of bytes compacted since server [re]start.
Compaction Completed Tasks	Number of completed compactions since server [re]start.
Compaction Completed	Throughput of completed compactions since server [re]start.

KeySpace Details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
KEYSPACE LATENCY DETAILS
Read Latency(/min)	Read operation latency per min
Read Latecy 99th% (/Min)	Read operation latency at 99th percentile per min
Read Total Latency(/Min)	Total time taken for read operations
Write Latency (/Min)	Write operation latency per min
Write Latency 99th% (/Min)	Write operation latency at 99th percentile per min
Write Total Latency(/Min)	Total time taken for write operations
KEYSPACE MEMTABLE DETAILS
All Memtables On Heap Datasize(MB)	Total amount of data stored in the memtables (2i and pending flush memtables included) that resides on -heap.
All Memtables Off Heap Datasize(MB)	Total amount of data stored in the memtables (2i and pending flush memtables included) that resides off -heap.
Memtable Live Data Size(MB)	Total amount of live data stored in the memtables (2i and pending flush memtables included) that resides off-heap, excluding any data structure overhead.
Memtable Columns Count	Total number of columns present in the memtable.
Memtable On Heap Datasize(MB)	Total amount of data stored in the memtable that resides on -heap, including column related overhead and partitions overwritten.
Memtable Off Heap Datasize(MB)	Total amount of data stored in the memtable that resides off -heap, including column related overhead and partitions overwritten.
Memtable Switch Count(/ Min)	Number of times flush has resulted in the memtable being switched out.

KeySpace Storage Details

Parameters	Description	JMX Support		Prometheus Support
		2 and below	3 and 4
Live Disk Space Used(MB)	Disk space used by SSTables belonging to this table (in bytes).
Live Scanned Histogram(/ Min)	Histogram of live cells scanned in queries on this table.
SS Table per Read Histogram(/ Min)	Histogram of the number of sstable data files accessed per single partition read. SSTables skipped due to Bloom Filters, min-max key or partition index lookup are not taken into account.
SS Table per Read Histogram 99th%	Histogram of the number of sstable data files accessed per single partition read at 99th percentile. SSTables skipped due to Bloom Filters, min-max key or partition index lookup are not taken into account.
Tomb Stone Scanned Histogram(/ Min)	Histogram of tombstones scanned in queries on this table per min
Bloom Filter Disk Space Used(KB)	Disk space used by bloom filter
Bloom Filter Off Heap Memory Used(KB)	Off-heap memory used by bloom filter.
Index Summary OFF heap Memory Used(KB)	Off-heap memory used by index summary