dcp

Shows statistics for Database Change Protocol (DCP).

Syntax

Request syuntax:

cbstats HOST:11210 dcp

Description

This command retrieves connections specific to statistics.

DCP statistics by connection type

DCP provides statistics for consumer, producer, and notifier connection types. The following tables describe the available consumer, producer, and notifier connection statistics. Each connection type has a group of statistics that apply to the connection overall and a group of statistics that apply to the individual streams in the connections.

The identifier for each DCP statistic begins with the string ep_dcpq: followed by a unique client_id and another colon. For example, if your client is named slave1, the identifier for the DCP statistic named created is ep_dcpq:slave1:created.

Table 1. Consumer connection statistics
Name	Description
`connected`	True if this client is connected
`created`	Creation time of the DCP connection
`pending_disconnect`	True if we’re hanging up on this client
`reserved`	True if the DCP stream is reserved
`supports_ack`	True if the connection use flow control
`total_acked_bytes`	The amount of bytes that the consumer has acknowledged
`type`	The connection type (producer, consumer, or notifier)

Consumer connection per-stream statistics

Name Description

Name	Description
`buffer_bytes`	The amount of unprocessed bytes
`buffer_items`	The amount of unprocessed items
`end_seqno`	The sequence number where this stream should end
`flags`	The flags used to create this stream
`items_ready`	Whether the stream has messages ready to send
`opaque`	The unique stream identifier
`snap_end_seqno`	The end sequence number of the last snapshot received
`snap_start_seqno`	The start sequence number of the last snapshot received
`start_seqno`	The start sequence number used to create this stream
`state`	The stream state (pending, reading, or dead)
`vb_uuid`	The vBucket UUID used to create this stream

buffer_bytes

The amount of unprocessed bytes

buffer_items

The amount of unprocessed items

end_seqno

The sequence number where this stream should end

flags

The flags used to create this stream

items_ready

Whether the stream has messages ready to send

opaque

The unique stream identifier

snap_end_seqno

The end sequence number of the last snapshot received

snap_start_seqno

The start sequence number of the last snapshot received

start_seqno

The start sequence number used to create this stream

state

The stream state (pending, reading, or dead)

vb_uuid

The vBucket UUID used to create this stream

Producer and notifier connection statistics

Name Description

Name	Description
`backfilled`	The amount of items sent from disk
`cur_snapshot_end`	The end sequence number of the current snapshot being received
`cur_snapshot_start`	The start sequence number of the current snapshot being received
`cur_snapshot_type`	The type of the current snapshot being received
`end_seqno`	The sequence number of the last mutation to send
`flags`	The flags supplied in the stream request
`items_ready`	Whether the stream has items ready to send
`last_sent_seqno`	The last sequence number sent by this stream
`memory`	The amount of items sent from memory
`opaque`	The unique stream identifier
`snap_end_seqno`	The last snapshot end sequence number (used if a consumer is resuming a stream)
`snap_start_seqno`	The last snapshot start sequence number (used if a consumer is resuming a stream)
`start_seqno`	The sequence number to start sending mutations from
`state`	The stream state (pending, backfilling, in-memory, takeover-send, takeover-wait, or dead)
`vb_uuid`	The vBucket UUID used in the stream request

backfilled

The amount of items sent from disk

cur_snapshot_end

The end sequence number of the current snapshot being received

cur_snapshot_start

The start sequence number of the current snapshot being received

cur_snapshot_type

The type of the current snapshot being received

end_seqno

The sequence number of the last mutation to send

flags

The flags supplied in the stream request

items_ready

Whether the stream has items ready to send

last_sent_seqno

The last sequence number sent by this stream

memory

The amount of items sent from memory

opaque

The unique stream identifier

snap_end_seqno

The last snapshot end sequence number (used if a consumer is resuming a stream)

snap_start_seqno

The last snapshot start sequence number (used if a consumer is resuming a stream)

start_seqno

The sequence number to start sending mutations from

state

The stream state (pending, backfilling, in-memory, takeover-send, takeover-wait, or dead)

vb_uuid

The vBucket UUID used in the stream request

Producer and notifier connection statistics

Name Description

Name	Description
`bytes_sent`	The amount of unacknowledged bytes sent to the consumer.
`connected`	True if this client is connected.
`created`	Creation time for the DCP connection.
`flow_control`	True if the connection uses flow control.
`items_remaining`	The amount of items remaining to be sent.
`items_sent`	The amount of items already sent to the consumer.
`last_sent_time`	The last time items have been sent.
`noop_enabled`	Indicates whether this connection sends noop’s .
`noop_wait`	Indicates whether this connection is waiting for a noop response from the consumer.
`pending_disconnect`	True if we’re hanging up on this client.
`reserved`	True if the DCP stream is reserved.
`supports_ack`	True if the connection uses flow control.
`total_acked_bytes`	The number of bytes that have been acknowledged by the consumer when flow control is enabled.
`total_bytes_sent`	The number of bytes already sent to the consumer.
`type`	The connection type (producer, consumer, or notifier).
`unacked_bytes`	The amount of bytes the consumer has not acknowledged.

bytes_sent

The amount of unacknowledged bytes sent to the consumer.

connected

True if this client is connected.

created

Creation time for the DCP connection.

flow_control

True if the connection uses flow control.

items_remaining

The amount of items remaining to be sent.

items_sent

The amount of items already sent to the consumer.

last_sent_time

The last time items have been sent.

noop_enabled

Indicates whether this connection sends noop’s .

noop_wait

Indicates whether this connection is waiting for a noop response from the consumer.

pending_disconnect

True if we’re hanging up on this client.

reserved

True if the DCP stream is reserved.

supports_ack

True if the connection uses flow control.

total_acked_bytes

The number of bytes that have been acknowledged by the consumer when flow control is enabled.

total_bytes_sent

The number of bytes already sent to the consumer.

type

The connection type (producer, consumer, or notifier).

unacked_bytes

The amount of bytes the consumer has not acknowledged.

Options

None

Example

This example shows a request for all DCP-related statistics.

# ./cbstats 10.5.2.54:11210 dcp

Here’s some output from the command. The output is quite lengthy, so this sample is truncated.

ep_dcp_count:                                                                               6
 ep_dcp_items_remaining:                                                                     0
 ep_dcp_items_sent:                                                                          0
 ep_dcp_producer_count:                                                                      3
 ep_dcp_queue_backfillremaining:                                                             0
 ep_dcp_queue_fill:                                                                          0
 ep_dcp_total_bytes:                                                                         6630
 ep_dcp_total_queue:                                                                         0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:connected:                      true
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:created:                        1168
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:pending_disconnect:             false
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:reserved:                       true
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_buffer_bytes:        0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_buffer_items:        0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_cur_snapshot_type:   none
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_end_seqno:           18446744073709551615
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_flags:               0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_items_ready:         false
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_last_received_seqno: 0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_opaque:              73
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_snap_end_seqno:      0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_snap_start_seqno:    0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_start_seqno:         0
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_state:               reading
 eq_dcpq:replication:ns_1@10.5.2.117->ns_1@10.5.2.54:default:stream_100_vb_uuid:             122364695596024
 ...