YB-Master metrics
This page documents the preview version (v2.23). Preview includes features under active development and is for development and testing only. For production, use the stable version (v2024.1). To learn more, see Versioning.
The YB-Master hosts system metadata, records about tables in the system and locations of their tablets, users, roles, permissions, and so on. YB-Masters are also responsible for coordinating background operations such as schema changes, handling addition and removal of nodes from the cluster, automatic re-replication of data on permanent failures, and so on.
All handler latency metrics include additional attributes. Refer to Throughput and latency.
The following are key metrics for evaluating YB-Master performance. All metrics are counters and units are microseconds.
| Metric (Counter | microseconds) | Description |
|---|---|
handler_latency_yb_master_MasterClient_GetTabletLocations |
Time spent on fetching the replicas from the master servers. This metric includes the number of times the locations of the replicas are fetched from the master server. |
handler_latency_yb_tserver_TabletServerService_Read |
Time to read the PostgreSQL system tables (during DDL). This metric includes the count or number of reads. |
handler_latency_yb_tserver_TabletServerService_Write |
Time to write the PostgreSQL system tables (during DDL). This metric includes the count or number of writes. |
handler_latency_yb_master_MasterDdl_CreateTable |
Time to create a table (during DDL). This metric includes the count of create table operations. |
handler_latency_yb_master_MasterDdl_DeleteTable |
Time to delete a table (during DDL). This metric includes the count of delete table operations. |
These metrics can be aggregated for nodes across the entire cluster using appropriate aggregations.