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ScyllaDB Enterprise Metric Update - ScyllaDB Enterprise 2022.1 to 2022.2¶

ScyllaDB Enterprise 2022.2 Dashboards are available as part of the latest Scylla Monitoring Stack.

New Metrics¶

The following metrics are new in ScyllaDB Enterprise 2022.2 compared to 2022.1:

Metric	Description
scylla_cache_rows_compacted_with_tombstones	Number of rows scanned during write of a tombstone for the purpose of compaction in cache
scylla_cache_rows_dropped_by_tombstones	Number of rows dropped in cache by a tombstone write
scylla_commitlog_active_allocations	Current number of active allocations.
scylla_commitlog_blocked_on_new_segment	Number of allocations blocked on acquiring new segment.
scylla_commitlog_bytes_flush_requested	Counts number of bytes requested to be flushed (persisted).
scylla_commitlog_bytes_released	Counts number of bytes released from disk. (Deleted/recycled)
scylla_commitlog_disk_slack_end_bytes	Holds size of disk space in bytes unused because of segment switching (end slack). A too high value indicates that we do not write enough data to each segment.
scylla_compaction_manager_completed_compactions	Holds the number of completed compaction tasks.
scylla_compaction_manager_failed_compactions	Holds the number of failed compaction tasks.
scylla_compaction_manager_normalized_backlog	Holds the sum of normalized compaction backlog for all tables in the system. Backlog is normalized by dividing backlog by shard’s available memory.
scylla_compaction_manager_postponed_compactions	Holds the number of tables with postponed compaction.
scylla_compaction_manager_validation_errors	Holds the number of encountered validation errors.
scylla_cql_authorized_prepared_statements_unprivileged_entries_evictions_on_size	Counts a number of evictions of prepared statements from the authorized prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.
scylla_cql_select_parallelized	Counts the number of parallelized aggregation SELECT query executions.
scylla_cql_unprivileged_entries_evictions_on_size	Counts a number of evictions of prepared statements from the prepared statements cache after they have been used only once. An increasing counter suggests the user may be preparing a different statement for each request instead of reusing the same prepared statement with parameters.
scylla_database_reads_shed_due_to_overload	The number of reads shed because the admission queue reached its max capacity. When the queue is full, excessive reads are shed to avoid overload.
scylla_database_sstable_read_queue_overloads	Counts the number of times the sstable read queue was overloaded. A non-zero value indicates that we have to drop read requests because they arrive faster than we can serve them.
scylla_database_total_reads_rate_limited	Counts read operations which were rejected on the replica side because the per-partition limit was reached.
scylla_database_total_writes_rate_limited	Counts write operations which were rejected on the replica side because the per-partition limit was reached.
scylla_forward_service_requests_dispatched_to_other_nodes	How many forward requests were dispatched to other nodes
scylla_forward_service_requests_dispatched_to_own_shards	How many forward requests were dispatched to local shards
scylla_forward_service_requests_executed	How many forward requests were executed
scylla_gossip_live	How many live nodes the current node sees
scylla_gossip_unreachable	How many unreachable nodes the current node sees
scylla_io_queue_adjusted_consumption	Consumed disk capacity units adjusted for class shares and idling preemption
scylla_io_queue_consumption	Accumulated disk capacity units consumed by this class; an increment per-second rate indicates full utilization
scylla_io_queue_disk_queue_length	Number of requests in the disk
scylla_io_queue_starvation_time_sec	Total time spent starving for disk
scylla_io_queue_total_delay_sec	Total time spent in the queue
scylla_io_queue_total_exec_sec	Total time spent in disk
scylla_io_queue_total_read_bytes	Total read bytes passed in the queue
scylla_io_queue_total_read_ops	Total read operations passed in the queue
scylla_io_queue_total_split_bytes	Total number of bytes split
scylla_io_queue_total_split_ops	Total number of requests split
scylla_io_queue_total_write_bytes	Total write bytes passed in the queue
scylla_io_queue_total_write_ops	Total write operations passed in the queue
scylla_node_ops_finished_percentage	Finished percentage of node operation on this shard
scylla_per_partition_rate_limiter_allocations	Number of times a entry was allocated over an empty/expired entry.
scylla_per_partition_rate_limiter_failed_allocations	Number of times the rate limiter gave up trying to allocate.
scylla_per_partition_rate_limiter_load_factor	Current load factor of the hash table (upper bound, may be overestimated).
scylla_per_partition_rate_limiter_probe_count	Number of probes made during lookups.
scylla_per_partition_rate_limiter_successful_lookups	Number of times a lookup returned an already allocated entry.
scylla_reactor_aio_outsizes	Total number of aio operations that exceed IO limit
scylla_schema_commitlog_active_allocations	Current number of active allocations.
scylla_scheduler_starvetime_ms	Accumulated starvation time of this task queue; an increment rate of 1000ms per second indicates the scheduler feels really bad
scylla_scheduler_waittime_ms	Accumulated waittime of this task queue; an increment rate of 1000ms per second indicates queue is waiting for something (e.g. IO)
scylla_schema_commitlog_allocating_segments	Holds the number of not closed segments that still have some free space. This value should not get too high.
scylla_schema_commitlog_alloc	Counts number of times a new mutation has been added to a segment. Divide bytes_written by this value to get the average number of bytes per mutation written to the disk.
scylla_schema_commitlog_blocked_on_new_segment	Number of allocations blocked on acquiring new segment.
scylla_schema_commitlog_bytes_flush_requested	Counts number of bytes requested to be flushed (persisted).
scylla_schema_commitlog_bytes_released	Counts number of bytes released from disk. (Deleted/recycled)
scylla_schema_commitlog_bytes_written	Counts number of bytes written to the disk. Divide this value by “alloc” to get the average number of bytes per mutation written to the disk.
scylla_schema_commitlog_cycle	Counts number of commitlog write cycles - when the data is written from the internal memory buffer to the disk.
scylla_schema_commitlog_disk_active_bytes	Holds size of disk space in bytes used for data so far. A too high value indicates that we have some bottleneck in the writing to sstables path.
scylla_schema_commitlog_disk_slack_end_bytes	Holds size of disk space in bytes unused because of segment switching (end slack). A too high value indicates that we do not write enough data to each segment.
scylla_schema_commitlog_disk_total_bytes	Holds size of disk space in bytes reserved for data so far. A too high value indicates that we have some bottleneck in the writing to sstables path.
scylla_schema_commitlog_flush	Counts number of times the flush() method was called for a file.
scylla_schema_commitlog_flush_limit_exceeded	Counts number of times a flush limit was exceeded. A non-zero value indicates that there are too many pending flush operations (see pending_flushes) and some of them will be blocked till the total amount of pending flush operations drops below 5.
scylla_schema_commitlog_memory_buffer_bytes	Holds the total number of bytes in internal memory buffers.
scylla_schema_commitlog_pending_allocations	Holds number of currently pending allocations. A non-zero value indicates that we have a bottleneck in the disk write flow.
scylla_schema_commitlog_pending_flushes	Holds number of currently pending flushes. See the related flush_limit_exceeded metric.
scylla_schema_commitlog_requests_blocked_memory	Counts number of requests blocked due to memory pressure. A non-zero value indicates that the commitlog memory quota is not enough to serve the required amount of requests.
scylla_schema_commitlog_segments	Holds the current number of segments.
scylla_schema_commitlog_slack	Counts number of unused bytes written to the disk due to disk segment alignment.
scylla_schema_commitlog_unused_segments	Holds the current number of unused segments. A non-zero value indicates that the disk write path became temporary slow.
scylla_sstables_index_page_cache_bytes_in_std	Total number of bytes in temporary buffers which live in the std allocator
scylla_sstables_index_page_evictions	Index pages which got evicted from memory
scylla_sstables_index_page_populations	Index pages which got populated into memory
scylla_sstables_index_page_used_bytes	Amount of bytes used by index pages in memory
scylla_sstables_pi_auto_scale_events	Number of promoted index auto-scaling events
scylla_storage_proxy_coordinator_read_rate_limited	Number of read requests which were rejected by replicas because rate limit for the partition was reached.
scylla_storage_proxy_coordinator_write_rate_limited	Number of write requests which were rejected by replicas because rate limit for the partition was reached.
scylla_storage_proxy_coordinator_writes_failed_due_to_too_many_in_flight_hints	Number of CQL write requests which failed because the hinted handoff mechanism is overloaded and cannot store any more in-flight hints
scylla_transport_auth_responses	Counts the total number of received CQL AUTH messages.
scylla_transport_batch_requests	Counts the total number of received CQL BATCH messages.
scylla_transport_cql_errors_total	Counts the total number of returned CQL errors.
scylla_transport_execute_requests	Counts the total number of received CQL EXECUTE messages.
scylla_transport_options_requests	Counts the total number of received CQL OPTIONS messages.
scylla_transport_prepare_requests	Counts the total number of received CQL PREPARE messages.
scylla_transport_query_requests	Counts the total number of received CQL QUERY messages.
scylla_transport_register_requests	Counts the total number of received CQL REGISTER messages.
scylla_transport_startups	Counts the total number of received CQL STARTUP messages.

Removed Metrics¶

The following metrics were removed in ScyllaDB Enterprise 2022.2:

scylla_database_querier_cache_memory_based_evictions
scylla_memory_streaming_dirty_bytes
scylla_memory_streaming_virtual_dirty_bytes
scylla_repair_row_from_disk_bytes
scylla_repair_row_from_disk_nr
scylla_repair_rx_hashes_nr
scylla_repair_rx_row_bytes
scylla_repair_rx_row_nr
scylla_repair_tx_hashes_nr
scylla_repair_tx_row_bytes
scylla_repair_tx_row_nr
scylla_thrift_current_connections
scylla_thrift_served
scylla_thrift_thrift_connections

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