nodetool tpstats

Provides usage statistics of thread pools.Provides usage statistics of thread pools.Synopsisnodetool <options> tpstatsCassandra tarball installations:installation_location/cassandra/binDescriptionCassandra is based on a Staged Event Driven Architecture (SEDA). Cassandra separates different tasks into stages connected by a messaging service. Each stage has a queue and a thread pool. Although some stages skip the messaging service and queue tasks immediately on a different stage when it exists on the same node. Cassandra can back up a queue if the next stage is too busy and lead to a performance bottlenecks. Thenodetool tpstatscommand reports on each stage of Cassandra operations by thread pool:Reports are updated when SSTables change through compaction or flushing.Run nodetool tpstats on a local node to get statistics for the thread pool used by the Cassandra instance running on that node.Run nodetool tpstats with the appropriate options to check the thread pool statistics for a remote node. For setup instructions, see Secure JMX Authentication.nodetool tpstats pool names and tasksThis table describes the Cassandra task or property associated with each pool name reported in the nodetool tpstats output: nodetool tpstats droppable messagesCassandra generates the messages listed below, but discards them after a timeout. The nodetool tpstats command reports the number of messages of each type that have been dropped. You can view the messages themselves using a JMX client.ExampleRunning nodetool tpstats on the host labcluster:nodetool -h labcluster tpstatsExample output is:Pool Name Active Pending Completed Blocked All time blockedCounterMutationStage 0 0 0 0 0ReadStage 0 0 103 0 0RequestResponseStage 0 0 0 0 0MutationStage 0 0 13234794 0 0ReadRepairStage 0 0 0 0 0GossipStage 0 0 0 0 0CacheCleanupExecutor 0 0 0 0 0AntiEntropyStage 0 0 0 0 0MigrationStage 0 0 11 0 0ValidationExecutor 0 0 0 0 0CommitLogArchiver 0 0 0 0 0MiscStage 0 0 0 0 0MemtableFlushWriter 0 0 126 0 0MemtableReclaimMemory 0 0 126 0 0PendingRangeCalculator 0 0 1 0 0MemtablePostFlush 0 0 1468 0 0CompactionExecutor 0 0 254 0 0InternalResponseStage 0 0 1 0 0HintedHandoff 0 0 0 Message type DroppedRANGE_SLICE 0READ_REPAIR 0PAGED_RANGE 0BINARY 0READ 0MUTATION 180_TRACE 0REQUEST_RESPONSE 0COUNTER_MUTATION 0