Checkpoint
Checkpoint stats provide detailed information on per-vbucket checkpoint data structure.
Description
Like Hash stats, requesting these stats has some impact on performance. Therefore, please do not poll them from the server frequently. Each stat is prefixed with =vb_= followed by a number, a colon, and then each stat name.
| Stat | Description |
|---|---|
| cursor_name:cursor_checkpoint_id | Checkpoint ID at which the cursor is |
| name ‘cursor_name’ is pointing now | |
| open_checkpoint_id | ID of the current open checkpoint |
| num_tap_cursors | Number of referencing TAP cursors |
| num_checkpoint_items | Number of total items in a checkpoint |
| data structure | |
| num_open_checkpoint_items | Number of items in the open checkpoint |
| num_checkpoints | Number of checkpoints in a checkpoint |
| data structure | |
| num_items_for_persistence | Number of items remaining for persistence |
| checkpoint_extension | True if the open checkpoint is in the |
| extension mode | |
| state | The state of the vbucket this checkpoint |
| contains data for | |
| last_closed_checkpoint_id | The last closed checkpoint number |
| persisted_checkpoint_id | The last persisted checkpoint number |
Example
Request example:
cbstats 10.5.2.117:11210 checkpoint
Response
Response example:
vb_0:last_closed_checkpoint_id: 1
vb_0:num_checkpoint_items: 1
vb_0:num_checkpoints: 1
vb_0:num_items_for_persistence: 0
vb_0:num_open_checkpoint_items: 0
vb_0:num_tap_cursors: 0
vb_0:open_checkpoint_id: 2
vb_0:persisted_checkpoint_id: 1
vb_0:state: active
...
vb_9:last_closed_checkpoint_id: 1
vb_9:num_checkpoint_items: 1
vb_9:num_checkpoints: 1
vb_9:num_items_for_persistence: 0
vb_9:num_open_checkpoint_items: 0
vb_9:num_tap_cursors: 0
vb_9:open_checkpoint_id: 2
vb_9:persisted_checkpoint_id: 1
vb_9:state: active