Available stats
The following histograms are available from “timings” in the general form to describe when time was spent doing various things:
| Stat | Description |
|---|---|
| bg_wait | bg fetches waiting in the dispatcher queue |
| bg_load | bg fetches waiting for disk |
| bg_tap_wait | tap bg fetches waiting in the dispatcher queue |
| bg_tap_load | tap bg fetches waiting for disk |
| pending_ops | client connections blocked for operationsin pending vbuckets |
| storage_age | Analogous to ep_storage_age in main stats |
| data_age | Analogous to ep_data_age in main stats |
| get_cmd | servicing get requests |
| arith_cmd | servicing incr/decr requests |
| get_stats_cmd | servicing get_stats requests |
| get_vb_cmd | servicing vbucket status requests |
| set_vb_cmd | servicing vbucket set state commands |
| del_vb_cmd | servicing vbucket deletion commands |
| chk_persistence_cmd | waiting for checkpoint persistence |
| tap_vb_set | servicing tap vbucket set state commands |
| tap_vb_reset | servicing tap vbucket reset commands |
| tap_mutation | servicing tap mutations |
| notify_io | waking blocked connections |
| paged_out_time | time (in seconds) objects are non-resident |
| disk_insert | waiting for disk to store a new item |
| disk_update | waiting for disk to modify an existing item |
| disk_del | waiting for disk to delete an item |
| disk_vb_del | waiting for disk to delete a vbucket |
| disk_commit | waiting for a commit after a batch of updates |
| disk_vbstate_snapshot | Time spent persisting vbucket state changes |
| item_alloc_sizes | Item allocation size counters (in bytes) |