| 1 | '\" t
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| 2 | .\" Title: ctdb-statistics
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| 3 | .\" Author:
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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| 5 | .\" Date: 01/27/2016
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| 6 | .\" Manual: CTDB - clustered TDB database
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| 7 | .\" Source: ctdb
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "CTDB\-STATISTICS" "7" "01/27/2016" "ctdb" "CTDB \- clustered TDB database"
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| 11 | .\" -----------------------------------------------------------------
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| 12 | .\" * Define some portability stuff
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| 13 | .\" -----------------------------------------------------------------
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| 14 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 15 | .\" http://bugs.debian.org/507673
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| 16 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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| 17 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 18 | .ie \n(.g .ds Aq \(aq
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| 19 | .el .ds Aq '
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| 20 | .\" -----------------------------------------------------------------
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| 21 | .\" * set default formatting
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| 22 | .\" -----------------------------------------------------------------
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| 23 | .\" disable hyphenation
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| 24 | .nh
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| 25 | .\" disable justification (adjust text to left margin only)
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| 26 | .ad l
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| 27 | .\" -----------------------------------------------------------------
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| 28 | .\" * MAIN CONTENT STARTS HERE *
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| 29 | .\" -----------------------------------------------------------------
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| 30 | .SH "NAME"
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| 31 | ctdb-statistics \- CTDB statistics output
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| 32 | .SH "OVERALL STATISTICS"
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| 33 | .PP
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| 34 | CTDB maintains information about various messages communicated and some of the important operations per node\&. See the
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| 35 | \fBctdb\fR(1)
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| 36 | commands
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| 37 | \fBstatistics\fR
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| 38 | and
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| 39 | \fBstatisticsreset\fR
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| 40 | for displaying statistics\&.
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| 41 | .SS "Example: ctdb statistics"
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| 42 | .sp
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| 43 | .if n \{\
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| 44 | .RS 4
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| 45 | .\}
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| 46 | .nf
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| 47 | CTDB version 1
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| 48 | Current time of statistics : Fri Sep 12 13:32:32 2014
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| 49 | Statistics collected since : (000 01:49:20) Fri Sep 12 11:43:12 2014
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| 50 | num_clients 6
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| 51 | frozen 0
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| 52 | recovering 0
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| 53 | num_recoveries 2
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| 54 | client_packets_sent 281293
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| 55 | client_packets_recv 296317
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| 56 | node_packets_sent 452387
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| 57 | node_packets_recv 182394
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| 58 | keepalive_packets_sent 3927
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| 59 | keepalive_packets_recv 3928
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| 60 | node
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| 61 | req_call 48605
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| 62 | reply_call 1
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| 63 | req_dmaster 23404
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| 64 | reply_dmaster 24917
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| 65 | reply_error 0
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| 66 | req_message 958
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| 67 | req_control 197513
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| 68 | reply_control 153705
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| 69 | client
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| 70 | req_call 130866
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| 71 | req_message 770
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| 72 | req_control 168921
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| 73 | timeouts
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| 74 | call 0
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| 75 | control 0
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| 76 | traverse 0
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| 77 | locks
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| 78 | num_calls 220
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| 79 | num_current 0
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| 80 | num_pending 0
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| 81 | num_failed 0
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| 82 | total_calls 130866
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| 83 | pending_calls 0
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| 84 | childwrite_calls 1
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| 85 | pending_childwrite_calls 0
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| 86 | memory_used 334490
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| 87 | max_hop_count 18
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| 88 | total_ro_delegations 2
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| 89 | total_ro_revokes 2
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| 90 | hop_count_buckets: 42816 5464 26 1 0 0 0 0 0 0 0 0 0 0 0 0
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| 91 | lock_buckets: 9 165 14 15 7 2 2 0 0 0 0 0 0 0 0 0
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| 92 | locks_latency MIN/AVG/MAX 0\&.000685/0\&.160302/6\&.369342 sec out of 214
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| 93 | reclock_ctdbd MIN/AVG/MAX 0\&.004940/0\&.004969/0\&.004998 sec out of 2
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| 94 | reclock_recd MIN/AVG/MAX 0\&.000000/0\&.000000/0\&.000000 sec out of 0
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| 95 | call_latency MIN/AVG/MAX 0\&.000006/0\&.000719/4\&.562991 sec out of 126626
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| 96 | childwrite_latency MIN/AVG/MAX 0\&.014527/0\&.014527/0\&.014527 sec out of 1
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| 97 |
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| 98 | .fi
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| 99 | .if n \{\
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| 100 | .RE
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| 101 | .\}
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| 102 | .SS "CTDB version"
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| 103 | .PP
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| 104 | Version of the ctdb protocol used by the node\&.
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| 105 | .SS "Current time of statistics"
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| 106 | .PP
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| 107 | Time when the statistics are generated\&.
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| 108 | .PP
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| 109 | This is useful when collecting statistics output periodically for post\-processing\&.
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| 110 | .SS "Statistics collected since"
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| 111 | .PP
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| 112 | Time when ctdb was started or the last time statistics was reset\&. The output shows the duration and the timestamp\&.
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| 113 | .SS "num_clients"
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| 114 | .PP
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| 115 | Number of processes currently connected to CTDB\*(Aqs unix socket\&. This includes recovery daemon, ctdb tool and samba processes (smbd, winbindd)\&.
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| 116 | .SS "frozen"
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| 117 | .PP
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| 118 | 1 if the the databases are currently frozen, 0 otherwise\&.
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| 119 | .SS "recovering"
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| 120 | .PP
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| 121 | 1 if recovery is active, 0 otherwise\&.
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| 122 | .SS "num_recoveries"
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| 123 | .PP
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| 124 | Number of recoveries since the start of ctdb or since the last statistics reset\&.
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| 125 | .SS "client_packets_sent"
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| 126 | .PP
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| 127 | Number of packets sent to client processes via unix domain socket\&.
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| 128 | .SS "client_packets_recv"
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| 129 | .PP
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| 130 | Number of packets received from client processes via unix domain socket\&.
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| 131 | .SS "node_packets_sent"
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| 132 | .PP
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| 133 | Number of packets sent to the other nodes in the cluster via TCP\&.
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| 134 | .SS "node_packets_recv"
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| 135 | .PP
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| 136 | Number of packets received from the other nodes in the cluster via TCP\&.
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| 137 | .SS "keepalive_packets_sent"
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| 138 | .PP
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| 139 | Number of keepalive messages sent to other nodes\&.
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| 140 | .PP
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| 141 | CTDB periodically sends keepalive messages to other nodes\&. See
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| 142 | KeepaliveInterval
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| 143 | tunable in
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| 144 | \fBctdb-tunables\fR(7)
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| 145 | for more details\&.
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| 146 | .SS "keepalive_packets_recv"
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| 147 | .PP
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| 148 | Number of keepalive messages received from other nodes\&.
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| 149 | .SS "node"
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| 150 | .PP
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| 151 | This section lists various types of messages processed which originated from other nodes via TCP\&.
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| 152 | .sp
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| 153 | .it 1 an-trap
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| 154 | .nr an-no-space-flag 1
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| 155 | .nr an-break-flag 1
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| 156 | .br
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| 157 | .ps +1
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| 158 | \fBreq_call\fR
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| 159 | .RS 4
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| 160 | .PP
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| 161 | Number of REQ_CALL messages from the other nodes\&.
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| 162 | .RE
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| 163 | .sp
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| 164 | .it 1 an-trap
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| 165 | .nr an-no-space-flag 1
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| 166 | .nr an-break-flag 1
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| 167 | .br
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| 168 | .ps +1
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| 169 | \fBreply_call\fR
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| 170 | .RS 4
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| 171 | .PP
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| 172 | Number of REPLY_CALL messages from the other nodes\&.
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| 173 | .RE
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| 174 | .sp
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| 175 | .it 1 an-trap
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| 176 | .nr an-no-space-flag 1
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| 177 | .nr an-break-flag 1
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| 178 | .br
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| 179 | .ps +1
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| 180 | \fBreq_dmaster\fR
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| 181 | .RS 4
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| 182 | .PP
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| 183 | Number of REQ_DMASTER messages from the other nodes\&.
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| 184 | .RE
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| 185 | .sp
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| 186 | .it 1 an-trap
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| 187 | .nr an-no-space-flag 1
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| 188 | .nr an-break-flag 1
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| 189 | .br
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| 190 | .ps +1
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| 191 | \fBreply_dmaster\fR
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| 192 | .RS 4
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| 193 | .PP
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| 194 | Number of REPLY_DMASTER messages from the other nodes\&.
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| 195 | .RE
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| 196 | .sp
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| 197 | .it 1 an-trap
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| 198 | .nr an-no-space-flag 1
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| 199 | .nr an-break-flag 1
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| 200 | .br
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| 201 | .ps +1
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| 202 | \fBreply_error\fR
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| 203 | .RS 4
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| 204 | .PP
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| 205 | Number of REPLY_ERROR messages from the other nodes\&.
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| 206 | .RE
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| 207 | .sp
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| 208 | .it 1 an-trap
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| 209 | .nr an-no-space-flag 1
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| 210 | .nr an-break-flag 1
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| 211 | .br
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| 212 | .ps +1
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| 213 | \fBreq_message\fR
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| 214 | .RS 4
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| 215 | .PP
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| 216 | Number of REQ_MESSAGE messages from the other nodes\&.
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| 217 | .RE
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| 218 | .sp
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| 219 | .it 1 an-trap
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| 220 | .nr an-no-space-flag 1
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| 221 | .nr an-break-flag 1
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| 222 | .br
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| 223 | .ps +1
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| 224 | \fBreq_control\fR
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| 225 | .RS 4
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| 226 | .PP
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| 227 | Number of REQ_CONTROL messages from the other nodes\&.
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| 228 | .RE
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| 229 | .sp
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| 230 | .it 1 an-trap
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| 231 | .nr an-no-space-flag 1
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| 232 | .nr an-break-flag 1
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| 233 | .br
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| 234 | .ps +1
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| 235 | \fBreply_control\fR
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| 236 | .RS 4
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| 237 | .PP
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| 238 | Number of REPLY_CONTROL messages from the other nodes\&.
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| 239 | .RE
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| 240 | .SS "client"
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| 241 | .PP
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| 242 | This section lists various types of messages processed which originated from clients via unix domain socket\&.
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| 243 | .sp
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| 244 | .it 1 an-trap
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| 245 | .nr an-no-space-flag 1
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| 246 | .nr an-break-flag 1
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| 247 | .br
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| 248 | .ps +1
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| 249 | \fBreq_call\fR
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| 250 | .RS 4
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| 251 | .PP
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| 252 | Number of REQ_CALL messages from the clients\&.
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| 253 | .RE
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| 254 | .sp
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| 255 | .it 1 an-trap
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| 256 | .nr an-no-space-flag 1
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| 257 | .nr an-break-flag 1
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| 258 | .br
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| 259 | .ps +1
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| 260 | \fBreq_message\fR
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| 261 | .RS 4
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| 262 | .PP
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| 263 | Number of REQ_MESSAGE messages from the clients\&.
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| 264 | .RE
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| 265 | .sp
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| 266 | .it 1 an-trap
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| 267 | .nr an-no-space-flag 1
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| 268 | .nr an-break-flag 1
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| 269 | .br
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| 270 | .ps +1
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| 271 | \fBreq_control\fR
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| 272 | .RS 4
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| 273 | .PP
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| 274 | Number of REQ_CONTROL messages from the clients\&.
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| 275 | .RE
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| 276 | .SS "timeouts"
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| 277 | .PP
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| 278 | This section lists timeouts occurred when sending various messages\&.
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| 279 | .sp
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| 280 | .it 1 an-trap
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| 281 | .nr an-no-space-flag 1
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| 282 | .nr an-break-flag 1
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| 283 | .br
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| 284 | .ps +1
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| 285 | \fBcall\fR
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| 286 | .RS 4
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| 287 | .PP
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| 288 | Number of timeouts for REQ_CALL messages\&.
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| 289 | .RE
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| 290 | .sp
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| 291 | .it 1 an-trap
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| 292 | .nr an-no-space-flag 1
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| 293 | .nr an-break-flag 1
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| 294 | .br
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| 295 | .ps +1
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| 296 | \fBcontrol\fR
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| 297 | .RS 4
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| 298 | .PP
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| 299 | Number of timeouts for REQ_CONTROL messages\&.
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| 300 | .RE
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| 301 | .sp
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| 302 | .it 1 an-trap
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| 303 | .nr an-no-space-flag 1
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| 304 | .nr an-break-flag 1
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| 305 | .br
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| 306 | .ps +1
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| 307 | \fBtraverse\fR
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| 308 | .RS 4
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| 309 | .PP
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| 310 | Number of timeouts for database traverse operations\&.
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| 311 | .RE
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| 312 | .SS "locks"
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| 313 | .PP
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| 314 | This section lists locking statistics\&.
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| 315 | .sp
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| 316 | .it 1 an-trap
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| 317 | .nr an-no-space-flag 1
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| 318 | .nr an-break-flag 1
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| 319 | .br
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| 320 | .ps +1
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| 321 | \fBnum_calls\fR
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| 322 | .RS 4
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| 323 | .PP
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| 324 | Number of completed lock calls\&. This includes database locks and record locks\&.
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| 325 | .RE
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| 326 | .sp
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| 327 | .it 1 an-trap
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| 328 | .nr an-no-space-flag 1
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| 329 | .nr an-break-flag 1
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| 330 | .br
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| 331 | .ps +1
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| 332 | \fBnum_current\fR
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| 333 | .RS 4
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| 334 | .PP
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| 335 | Number of scheduled lock calls\&. This includes database locks and record locks\&.
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| 336 | .RE
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| 337 | .sp
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| 338 | .it 1 an-trap
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| 339 | .nr an-no-space-flag 1
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| 340 | .nr an-break-flag 1
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| 341 | .br
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| 342 | .ps +1
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| 343 | \fBnum_pending\fR
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| 344 | .RS 4
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| 345 | .PP
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| 346 | Number of queued lock calls\&. This includes database locks and record locks\&.
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| 347 | .RE
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| 348 | .sp
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| 349 | .it 1 an-trap
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| 350 | .nr an-no-space-flag 1
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| 351 | .nr an-break-flag 1
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| 352 | .br
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| 353 | .ps +1
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| 354 | \fBnum_failed\fR
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| 355 | .RS 4
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| 356 | .PP
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| 357 | Number of failed lock calls\&. This includes database locks and record locks\&.
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| 358 | .RE
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| 359 | .SS "total_calls"
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| 360 | .PP
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| 361 | Number of req_call messages processed from clients\&. This number should be same as client \-\-> req_call\&.
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| 362 | .SS "pending_calls"
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| 363 | .PP
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| 364 | Number of req_call messages which are currenly being processed\&. This number indicates the number of record migrations in flight\&.
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| 365 | .SS "childwrite_calls"
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| 366 | .PP
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| 367 | Number of record update calls\&. Record update calls are used to update a record under a transaction\&.
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| 368 | .SS "pending_childwrite_calls"
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| 369 | .PP
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| 370 | Number of record update calls currently active\&.
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| 371 | .SS "memory_used"
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| 372 | .PP
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| 373 | The amount of memory in bytes currently used by CTDB using talloc\&. This includes all the memory used for CTDB\*(Aqs internal data structures\&. This does not include the memory mapped TDB databases\&.
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| 374 | .SS "max_hop_count"
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| 375 | .PP
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| 376 | The maximum number of hops required for a record migration request to obtain the record\&. High numbers indicate record contention\&.
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| 377 | .SS "total_ro_delegations"
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| 378 | .PP
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| 379 | Number of readonly delegations created\&.
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| 380 | .SS "total_ro_revokes"
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| 381 | .PP
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| 382 | Number of readonly delegations that were revoked\&. The difference between total_ro_revokes and total_ro_delegations gives the number of currently active readonly delegations\&.
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| 383 | .SS "hop_count_buckets"
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| 384 | .PP
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| 385 | Distribution of migration requests based on hop counts values\&. Buckets are 1, < 4, < 8, < 16, < 32, < 64, < 128, < 256, < 512, ⥠512\&.
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| 386 | .SS "lock_buckets"
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| 387 | .PP
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| 388 | Distribution of record lock requests based on time required to obtain locks\&. Buckets are < 1ms, < 10ms, < 100ms, < 1s, < 2s, < 4s, < 8s, < 16s, < 32s, < 64s, ⥠64s\&.
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| 389 | .SS "locks_latency"
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| 390 | .PP
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| 391 | The minimum, the average and the maximum time (in seconds) required to obtain record locks\&.
|
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| 392 | .SS "reclock_ctdbd"
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| 393 | .PP
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| 394 | The minimum, the average and the maximum time (in seconds) required to check if recovery lock is still held by recovery daemon when recovery mode is changed\&. This check is done in ctdb daemon\&.
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| 395 | .SS "reclock_recd"
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| 396 | .PP
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| 397 | The minimum, the average and the maximum time (in seconds) required to check if recovery lock is still held by recovery daemon during recovery\&. This check is done in recovery daemon\&.
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| 398 | .SS "call_latency"
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| 399 | .PP
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| 400 | The minimum, the average and the maximum time (in seconds) required to process a REQ_CALL message from client\&. This includes the time required to migrate a record from remote node, if the record is not available on the local node\&.
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| 401 | .SS "childwrite_latency"
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| 402 | .PP
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| 403 | Default: 0
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| 404 | .PP
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| 405 | The minimum, the average and the maximum time (in seconds) required to update records under a transaction\&.
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|---|
| 406 | .SH "DATABASE STATISTICS"
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| 407 | .PP
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| 408 | CTDB maintains per database statistics about important operations\&. See the
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| 409 | \fBctdb\fR(1)
|
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| 410 | command
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|---|
| 411 | \fBdbstatistics\fR
|
|---|
| 412 | for displaying database statistics\&.
|
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| 413 | .SS "Example: ctdb dbstatistics notify_index\&.tdb"
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| 414 | .sp
|
|---|
| 415 | .if n \{\
|
|---|
| 416 | .RS 4
|
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| 417 | .\}
|
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| 418 | .nf
|
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| 419 | DB Statistics: notify_index\&.tdb
|
|---|
| 420 | ro_delegations 0
|
|---|
| 421 | ro_revokes 0
|
|---|
| 422 | locks
|
|---|
| 423 | total 131
|
|---|
| 424 | failed 0
|
|---|
| 425 | current 0
|
|---|
| 426 | pending 0
|
|---|
| 427 | hop_count_buckets: 9890 5454 26 1 0 0 0 0 0 0 0 0 0 0 0 0
|
|---|
| 428 | lock_buckets: 4 117 10 0 0 0 0 0 0 0 0 0 0 0 0 0
|
|---|
| 429 | locks_latency MIN/AVG/MAX 0\&.000683/0\&.004198/0\&.014730 sec out of 131
|
|---|
| 430 | Num Hot Keys: 3
|
|---|
| 431 | Count:7 Key:2f636c75737465726673
|
|---|
| 432 | Count:18 Key:2f636c757374657266732f64617461
|
|---|
| 433 | Count:7 Key:2f636c757374657266732f646174612f636c69656e7473
|
|---|
| 434 |
|
|---|
| 435 | .fi
|
|---|
| 436 | .if n \{\
|
|---|
| 437 | .RE
|
|---|
| 438 | .\}
|
|---|
| 439 | .SS "DB Statistics"
|
|---|
| 440 | .PP
|
|---|
| 441 | Name of the database\&.
|
|---|
| 442 | .SS "ro_delegations"
|
|---|
| 443 | .PP
|
|---|
| 444 | Number of readonly delegations created in the database\&.
|
|---|
| 445 | .SS "ro_revokes"
|
|---|
| 446 | .PP
|
|---|
| 447 | Number of readonly delegations revoked\&. The difference in ro_delegations and ro_revokes indicates the currently active readonly delegations\&.
|
|---|
| 448 | .SS "locks"
|
|---|
| 449 | .PP
|
|---|
| 450 | This section lists locking statistics\&.
|
|---|
| 451 | .sp
|
|---|
| 452 | .it 1 an-trap
|
|---|
| 453 | .nr an-no-space-flag 1
|
|---|
| 454 | .nr an-break-flag 1
|
|---|
| 455 | .br
|
|---|
| 456 | .ps +1
|
|---|
| 457 | \fBtotal\fR
|
|---|
| 458 | .RS 4
|
|---|
| 459 | .PP
|
|---|
| 460 | Number of completed lock calls\&. This includes database locks and record locks\&.
|
|---|
| 461 | .RE
|
|---|
| 462 | .sp
|
|---|
| 463 | .it 1 an-trap
|
|---|
| 464 | .nr an-no-space-flag 1
|
|---|
| 465 | .nr an-break-flag 1
|
|---|
| 466 | .br
|
|---|
| 467 | .ps +1
|
|---|
| 468 | \fBfailed\fR
|
|---|
| 469 | .RS 4
|
|---|
| 470 | .PP
|
|---|
| 471 | Number of failed lock calls\&. This includes database locks and record locks\&.
|
|---|
| 472 | .RE
|
|---|
| 473 | .sp
|
|---|
| 474 | .it 1 an-trap
|
|---|
| 475 | .nr an-no-space-flag 1
|
|---|
| 476 | .nr an-break-flag 1
|
|---|
| 477 | .br
|
|---|
| 478 | .ps +1
|
|---|
| 479 | \fBcurrent\fR
|
|---|
| 480 | .RS 4
|
|---|
| 481 | .PP
|
|---|
| 482 | Number of scheduled lock calls\&. This includes database locks and record locks\&.
|
|---|
| 483 | .RE
|
|---|
| 484 | .sp
|
|---|
| 485 | .it 1 an-trap
|
|---|
| 486 | .nr an-no-space-flag 1
|
|---|
| 487 | .nr an-break-flag 1
|
|---|
| 488 | .br
|
|---|
| 489 | .ps +1
|
|---|
| 490 | \fBpending\fR
|
|---|
| 491 | .RS 4
|
|---|
| 492 | .PP
|
|---|
| 493 | Number of queued lock calls\&. This includes database locks and record locks\&.
|
|---|
| 494 | .RE
|
|---|
| 495 | .SS "hop_count_buckets"
|
|---|
| 496 | .PP
|
|---|
| 497 | Distribution of migration requests based on hop counts values\&. Buckets are 1, < 4, < 8, < 16, < 32, < 64, < 128, < 256, < 512, ⥠512\&.
|
|---|
| 498 | .SS "lock_buckets"
|
|---|
| 499 | .PP
|
|---|
| 500 | Distribution of record lock requests based on time required to obtain locks\&. Buckets are < 1ms, < 10ms, < 100ms, < 1s, < 2s, < 4s, < 8s, < 16s, < 32s, < 64s, ⥠64s\&.
|
|---|
| 501 | .SS "locks_latency"
|
|---|
| 502 | .PP
|
|---|
| 503 | The minimum, the average and the maximum time (in seconds) required to obtain record locks\&.
|
|---|
| 504 | .SS "Num Hot Keys"
|
|---|
| 505 | .PP
|
|---|
| 506 | Number of contended records determined by hop count\&. CTDB keeps track of top 10 hot records and the output shows hex encoded keys for the hot records\&.
|
|---|
| 507 | .SH "SEE ALSO"
|
|---|
| 508 | .PP
|
|---|
| 509 | \fBctdb\fR(1),
|
|---|
| 510 | \fBctdbd\fR(1),
|
|---|
| 511 | \fBctdb-tunables\fR(7),
|
|---|
| 512 | \m[blue]\fB\%http://ctdb.samba.org/\fR\m[]
|
|---|
| 513 | .SH "AUTHOR"
|
|---|
| 514 | .br
|
|---|
| 515 | .PP
|
|---|
| 516 | This documentation was written by Amitay Isaacs, Martin Schwenke
|
|---|
| 517 | .SH "COPYRIGHT"
|
|---|
| 518 | .br
|
|---|
| 519 | Copyright \(co 2007 Andrew Tridgell, Ronnie Sahlberg
|
|---|
| 520 | .br
|
|---|
| 521 | .PP
|
|---|
| 522 | This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version\&.
|
|---|
| 523 | .PP
|
|---|
| 524 | This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE\&. See the GNU General Public License for more details\&.
|
|---|
| 525 | .PP
|
|---|
| 526 | You should have received a copy of the GNU General Public License along with this program; if not, see
|
|---|
| 527 | \m[blue]\fB\%http://www.gnu.org/licenses\fR\m[]\&.
|
|---|
| 528 | .sp
|
|---|
