A newer version of this documentation is available.

View Latest

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

    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

    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

    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
     ...