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YB-Master metrics

Monitor table and tablet operations

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.