Monitored Parameters

Applications Manager monitors attributes of your Windows Server Cluster components - nodes in a cluster, cluster networks, resource groups and critical cluster events. You can also configure thresholds to the numerical attributes monitored by the server based on these details.

The Availability tab shows the Availability history of the Cassandra database for the past 24 hours or 30 days. The Performance tab shows the Health Status and events for the past 24 hours or 30 days. The List view enables you to perform bulk admin configurations. Click on the individual monitors listed to view the following information:

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
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 (available from Version 2.0.9 onwards)
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 (available from Version 2.0.9 onwards)
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
Commitlog/Compaction- Pending Tasks	Number of Commitlog and Compaction tasks waiting in the queue to be executed.
Commands/Responses- Pending Tasks	Number of Command and 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
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
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.

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