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-'\" t
-.\" Title: ctdb-statistics
-.\" Author:
-.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
-.\" Date: 09/23/2020
-.\" Manual: CTDB - clustered TDB database
-.\" Source: ctdb
-.\" Language: English
-.\"
-.TH "CTDB\-STATISTICS" "7" "09/23/2020" "ctdb" "CTDB \- clustered TDB database"
-.\" -----------------------------------------------------------------
-.\" * Define some portability stuff
-.\" -----------------------------------------------------------------
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.\" http://bugs.debian.org/507673
-.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.ie \n(.g .ds Aq \(aq
-.el .ds Aq '
-.\" -----------------------------------------------------------------
-.\" * set default formatting
-.\" -----------------------------------------------------------------
-.\" disable hyphenation
-.nh
-.\" disable justification (adjust text to left margin only)
-.ad l
-.\" -----------------------------------------------------------------
-.\" * MAIN CONTENT STARTS HERE *
-.\" -----------------------------------------------------------------
-.SH "NAME"
-ctdb-statistics \- CTDB statistics output
-.SH "OVERALL STATISTICS"
-.PP
-CTDB maintains information about various messages communicated and some of the important operations per node\&. See the
-\fBctdb\fR(1)
-commands
-\fBstatistics\fR
-and
-\fBstatisticsreset\fR
-for displaying statistics\&.
-.SS "Example: ctdb statistics"
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-CTDB version 1
-Current time of statistics : Fri Sep 12 13:32:32 2014
-Statistics collected since : (000 01:49:20) Fri Sep 12 11:43:12 2014
- num_clients 6
- frozen 0
- recovering 0
- num_recoveries 2
- client_packets_sent 281293
- client_packets_recv 296317
- node_packets_sent 452387
- node_packets_recv 182394
- keepalive_packets_sent 3927
- keepalive_packets_recv 3928
- node
- req_call 48605
- reply_call 1
- req_dmaster 23404
- reply_dmaster 24917
- reply_error 0
- req_message 958
- req_control 197513
- reply_control 153705
- client
- req_call 130866
- req_message 770
- req_control 168921
- timeouts
- call 0
- control 0
- traverse 0
- locks
- num_calls 220
- num_current 0
- num_pending 0
- num_failed 0
- total_calls 130866
- pending_calls 0
- childwrite_calls 1
- pending_childwrite_calls 0
- memory_used 334490
- max_hop_count 18
- total_ro_delegations 2
- total_ro_revokes 2
- hop_count_buckets: 42816 5464 26 1 0 0 0 0 0 0 0 0 0 0 0 0
- lock_buckets: 9 165 14 15 7 2 2 0 0 0 0 0 0 0 0 0
- locks_latency MIN/AVG/MAX 0\&.000685/0\&.160302/6\&.369342 sec out of 214
- reclock_ctdbd MIN/AVG/MAX 0\&.004940/0\&.004969/0\&.004998 sec out of 2
- reclock_recd MIN/AVG/MAX 0\&.000000/0\&.000000/0\&.000000 sec out of 0
- call_latency MIN/AVG/MAX 0\&.000006/0\&.000719/4\&.562991 sec out of 126626
- childwrite_latency MIN/AVG/MAX 0\&.014527/0\&.014527/0\&.014527 sec out of 1
-
-.fi
-.if n \{\
-.RE
-.\}
-.SS "CTDB version"
-.PP
-Version of the ctdb protocol used by the node\&.
-.SS "Current time of statistics"
-.PP
-Time when the statistics are generated\&.
-.PP
-This is useful when collecting statistics output periodically for post\-processing\&.
-.SS "Statistics collected since"
-.PP
-Time when ctdb was started or the last time statistics was reset\&. The output shows the duration and the timestamp\&.
-.SS "num_clients"
-.PP
-Number of processes currently connected to CTDB\*(Aqs unix socket\&. This includes recovery daemon, ctdb tool and samba processes (smbd, winbindd)\&.
-.SS "frozen"
-.PP
-1 if the databases are currently frozen, 0 otherwise\&.
-.SS "recovering"
-.PP
-1 if recovery is active, 0 otherwise\&.
-.SS "num_recoveries"
-.PP
-Number of recoveries since the start of ctdb or since the last statistics reset\&.
-.SS "client_packets_sent"
-.PP
-Number of packets sent to client processes via unix domain socket\&.
-.SS "client_packets_recv"
-.PP
-Number of packets received from client processes via unix domain socket\&.
-.SS "node_packets_sent"
-.PP
-Number of packets sent to the other nodes in the cluster via TCP\&.
-.SS "node_packets_recv"
-.PP
-Number of packets received from the other nodes in the cluster via TCP\&.
-.SS "keepalive_packets_sent"
-.PP
-Number of keepalive messages sent to other nodes\&.
-.PP
-CTDB periodically sends keepalive messages to other nodes\&. See
-KeepaliveInterval
-tunable in
-\fBctdb-tunables\fR(7)
-for more details\&.
-.SS "keepalive_packets_recv"
-.PP
-Number of keepalive messages received from other nodes\&.
-.SS "node"
-.PP
-This section lists various types of messages processed which originated from other nodes via TCP\&.
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_call\fR
-.RS 4
-.PP
-Number of REQ_CALL messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreply_call\fR
-.RS 4
-.PP
-Number of REPLY_CALL messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_dmaster\fR
-.RS 4
-.PP
-Number of REQ_DMASTER messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreply_dmaster\fR
-.RS 4
-.PP
-Number of REPLY_DMASTER messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreply_error\fR
-.RS 4
-.PP
-Number of REPLY_ERROR messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_message\fR
-.RS 4
-.PP
-Number of REQ_MESSAGE messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_control\fR
-.RS 4
-.PP
-Number of REQ_CONTROL messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreply_control\fR
-.RS 4
-.PP
-Number of REPLY_CONTROL messages from the other nodes\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_tunnel\fR
-.RS 4
-.PP
-Number of REQ_TUNNEL messages from the other nodes\&.
-.RE
-.SS "client"
-.PP
-This section lists various types of messages processed which originated from clients via unix domain socket\&.
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_call\fR
-.RS 4
-.PP
-Number of REQ_CALL messages from the clients\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_message\fR
-.RS 4
-.PP
-Number of REQ_MESSAGE messages from the clients\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_control\fR
-.RS 4
-.PP
-Number of REQ_CONTROL messages from the clients\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBreq_tunnel\fR
-.RS 4
-.PP
-Number of REQ_TUNNEL messages from the clients\&.
-.RE
-.SS "timeouts"
-.PP
-This section lists timeouts occurred when sending various messages\&.
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBcall\fR
-.RS 4
-.PP
-Number of timeouts for REQ_CALL messages\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBcontrol\fR
-.RS 4
-.PP
-Number of timeouts for REQ_CONTROL messages\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBtraverse\fR
-.RS 4
-.PP
-Number of timeouts for database traverse operations\&.
-.RE
-.SS "locks"
-.PP
-This section lists locking statistics\&.
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBnum_calls\fR
-.RS 4
-.PP
-Number of completed lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBnum_current\fR
-.RS 4
-.PP
-Number of scheduled lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBnum_pending\fR
-.RS 4
-.PP
-Number of queued lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBnum_failed\fR
-.RS 4
-.PP
-Number of failed lock calls\&. This includes database locks and record locks\&.
-.RE
-.SS "total_calls"
-.PP
-Number of req_call messages processed from clients\&. This number should be same as client \-\-> req_call\&.
-.SS "pending_calls"
-.PP
-Number of req_call messages which are currently being processed\&. This number indicates the number of record migrations in flight\&.
-.SS "childwrite_calls"
-.PP
-Number of record update calls\&. Record update calls are used to update a record under a transaction\&.
-.SS "pending_childwrite_calls"
-.PP
-Number of record update calls currently active\&.
-.SS "memory_used"
-.PP
-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\&.
-.SS "max_hop_count"
-.PP
-The maximum number of hops required for a record migration request to obtain the record\&. High numbers indicate record contention\&.
-.SS "total_ro_delegations"
-.PP
-Number of readonly delegations created\&.
-.SS "total_ro_revokes"
-.PP
-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\&.
-.SS "hop_count_buckets"
-.PP
-Distribution of migration requests based on hop counts values\&. Buckets are 0, <\ \&2, <\ \&4, <\ \&8, <\ \&16, <\ \&32, <\ \&64, <\ \&128, <\ \&256, <\ \&512, <\ \&1024, <\ \&2048, <\ \&4096, <\ \&8192, <\ \&16384, ≥\ \&16384\&.
-.SS "lock_buckets"
-.PP
-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\&.
-.SS "locks_latency"
-.PP
-The minimum, the average and the maximum time (in seconds) required to obtain record locks\&.
-.SS "reclock_ctdbd"
-.PP
-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\&.
-.SS "reclock_recd"
-.PP
-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\&.
-.SS "call_latency"
-.PP
-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\&.
-.SS "childwrite_latency"
-.PP
-Default: 0
-.PP
-The minimum, the average and the maximum time (in seconds) required to update records under a transaction\&.
-.SH "DATABASE STATISTICS"
-.PP
-CTDB maintains per database statistics about important operations\&. See the
-\fBctdb\fR(1)
-command
-\fBdbstatistics\fR
-for displaying database statistics\&.
-.SS "Example: ctdb dbstatistics notify_index\&.tdb"
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-DB Statistics: notify_index\&.tdb
- ro_delegations 0
- ro_revokes 0
- locks
- total 131
- failed 0
- current 0
- pending 0
- hop_count_buckets: 9890 5454 26 1 0 0 0 0 0 0 0 0 0 0 0 0
- lock_buckets: 4 117 10 0 0 0 0 0 0 0 0 0 0 0 0 0
- locks_latency MIN/AVG/MAX 0\&.000683/0\&.004198/0\&.014730 sec out of 131
- Num Hot Keys: 3
- Count:7 Key:2f636c75737465726673
- Count:18 Key:2f636c757374657266732f64617461
- Count:7 Key:2f636c757374657266732f646174612f636c69656e7473
-
-.fi
-.if n \{\
-.RE
-.\}
-.SS "DB Statistics"
-.PP
-Name of the database\&.
-.SS "ro_delegations"
-.PP
-Number of readonly delegations created in the database\&.
-.SS "ro_revokes"
-.PP
-Number of readonly delegations revoked\&. The difference in ro_delegations and ro_revokes indicates the currently active readonly delegations\&.
-.SS "locks"
-.PP
-This section lists locking statistics\&.
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBtotal\fR
-.RS 4
-.PP
-Number of completed lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBfailed\fR
-.RS 4
-.PP
-Number of failed lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBcurrent\fR
-.RS 4
-.PP
-Number of scheduled lock calls\&. This includes database locks and record locks\&.
-.RE
-.sp
-.it 1 an-trap
-.nr an-no-space-flag 1
-.nr an-break-flag 1
-.br
-.ps +1
-\fBpending\fR
-.RS 4
-.PP
-Number of queued lock calls\&. This includes database locks and record locks\&.
-.RE
-.SS "hop_count_buckets"
-.PP
-Distribution of migration requests based on hop counts values\&. Buckets are 0, <\ \&2, <\ \&4, <\ \&8, <\ \&16, <\ \&32, <\ \&64, <\ \&128, <\ \&256, <\ \&512, <\ \&1024, <\ \&2048, <\ \&4096, <\ \&8192, <\ \&16384, ≥\ \&16384\&.
-.SS "lock_buckets"
-.PP
-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\&.
-.SS "locks_latency"
-.PP
-The minimum, the average and the maximum time (in seconds) required to obtain record locks\&.
-.SS "Num Hot Keys"
-.PP
-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\&.
-.SH "SEE ALSO"
-.PP
-\fBctdb\fR(1),
-\fBctdbd\fR(1),
-\fBctdb-tunables\fR(7),
-\m[blue]\fB\%http://ctdb.samba.org/\fR\m[]
-.SH "AUTHOR"
-.br
-.PP
-This documentation was written by Amitay Isaacs, Martin Schwenke
-.SH "COPYRIGHT"
-.br
-Copyright \(co 2007 Andrew Tridgell, Ronnie Sahlberg
-.br
-.PP
-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\&.
-.PP
-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\&.
-.PP
-You should have received a copy of the GNU General Public License along with this program; if not, see
-\m[blue]\fB\%http://www.gnu.org/licenses\fR\m[]\&.
-.sp