TDengine Monitoring

After TDengine is started, it automatically writes monitoring data including CPU, memory and disk usage, bandwidth, number of requests, disk I/O speed, slow queries, into a designated database at a predefined interval through taosKeeper. Additionally, some important system operations, like logon, create user, drop database, and alerts and warnings generated in TDengine are written into the log database too. A system operator can view the data in log database from TDengine CLI or from a web console.

The collection of the monitoring information is enabled by default, but can be disabled by parameter monitor in the configuration file.

TDinsight

TDinsight is a complete solution which uses the monitoring database log mentioned previously, and Grafana, to monitor a TDengine cluster.

A script TDinsight.sh is provided to deploy TDinsight automatically.

Download TDinsight.sh with the below command:

wget https://github.com/taosdata/grafanaplugin/raw/master/dashboards/TDinsight.sh
chmod +x TDinsight.sh

Prepare:

1. TDengine Server

   • The URL of REST service: for example http://localhost:6041 if TDengine is deployed locally
   • User name and password

2. Grafana Alert Notification

You can use below command to setup Grafana alert notification.

An existing Grafana Notification Channel can be specified with parameter -E, the notifier uid of the channel can be obtained by curl -u admin:admin localhost:3000/api/alert-notifications |jq

 ```bash
 ./TDinsight.sh -a http://localhost:6041 -u root -p taosdata -E <notifier uid>
 ```

Launch TDinsight.sh with the command above and restart Grafana, then open Dashboard http://localhost:3000/d/tdinsight.

log database

The data of tdinsight dashboard is stored in log database (default. You can change it in taoskeeper's config file. For more infrmation, please reference to taoskeeper document). The taoskeeper will create log database on taoskeeper startup.

cluster_info table

cluster_info table contains cluster information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
first_ep	VARCHAR		first ep of cluster
first_ep_dnode_id	INT		dnode id or first_ep
version	VARCHAR		tdengine version. such as: 3.0.4.0
master_uptime	FLOAT		days of master's uptime
monitor_interval	INT		monitor interval in second
dbs_total	INT		total number of databases in cluster
tbs_total	BIGINT		total number of tables in cluster
stbs_total	INT		total number of stables in cluster
dnodes_total	INT		total number of dnodes in cluster
dnodes_alive	INT		total number of dnodes in ready state
mnodes_total	INT		total number of mnodes in cluster
mnodes_alive	INT		total number of mnodes in ready state
vgroups_total	INT		total number of vgroups in cluster
vgroups_alive	INT		total number of vgroups in ready state
vnodes_total	INT		total number of vnode in cluster
vnodes_alive	INT		total number of vnode in ready state
connections_total	INT		total number of connections to cluster
topics_total	INT		total number of topics in cluster
streams_total	INT		total number of streams in cluster
protocol	INT		protocol version
cluster_id	NCHAR	TAG	cluster id

d_info table

d_info table contains dnodes information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
status	VARCHAR		dnode status
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

m_info table

m_info table contains mnode information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
role	VARCHAR		the role of mnode. leader or follower
mnode_id	INT	TAG	master node id
mnode_ep	NCHAR	TAG	master node endpoint
cluster_id	NCHAR	TAG	cluster id

dnodes_info table

dnodes_info table contains dnodes information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
uptime	FLOAT		dnode uptime in days
cpu_engine	FLOAT		cpu usage of tdengine. read from /proc/<taosd_pid>/stat
cpu_system	FLOAT		cpu usage of server. read from /proc/stat
cpu_cores	FLOAT		cpu cores of server
mem_engine	INT		memory usage of tdengine. read from /proc/<taosd_pid>/status
mem_system	INT		available memory on the server in KB
mem_total	INT		total memory of server in KB
disk_engine	INT
disk_used	BIGINT		usage of data dir in bytes
disk_total	BIGINT		the capacity of data dir in bytes
net_in	FLOAT		network throughput rate in byte/s. read from /proc/net/dev
net_out	FLOAT		network throughput rate in byte/s. read from /proc/net/dev
io_read	FLOAT		io throughput rate in byte/s. read from /proc/<taosd_pid>/io
io_write	FLOAT		io throughput rate in byte/s. read from /proc/<taosd_pid>/io
io_read_disk	FLOAT		io throughput rate of disk in byte/s. read from /proc/<taosd_pid>/io
io_write_disk	FLOAT		io throughput rate of disk in byte/s. read from /proc/<taosd_pid>/io
req_select	INT		number of select queries received per dnode
req_select_rate	FLOAT		number of select queries received per dnode divided by monitor interval.
req_insert	INT		number of insert queries received per dnode
req_insert_success	INT		number of successfully insert queries received per dnode
req_insert_rate	FLOAT		number of insert queries received per dnode divided by monitor interval
req_insert_batch	INT		number of batch insertions
req_insert_batch_success	INT		number of successful batch insertions
req_insert_batch_rate	FLOAT		number of batch insertions divided by monitor interval
errors	INT		dnode errors
vnodes_num	INT		number of vnodes per dnode
masters	INT		number of master vnodes
has_mnode	INT		if the dnode has mnode
has_qnode	INT		if the dnode has qnode
has_snode	INT		if the dnode has snode
has_bnode	INT		if the dnode has bnode
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

data_dir table

data_dir table contains data directory information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
name	NCHAR		data directory. default is /var/lib/taos
level	INT		level for multi-level storage
avail	BIGINT		available space for data directory in bytes
used	BIGINT		used space for data directory in bytes
total	BIGINT		total space for data directory in bytes
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

log_dir table

log_dir table contains log directory information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
name	NCHAR		log directory. default is /var/log/taos/
avail	BIGINT		available space for log directory in bytes
used	BIGINT		used space for data directory in bytes
total	BIGINT		total space for data directory in bytes
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

temp_dir table

temp_dir table contains temp dir information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
name	NCHAR		temp directory. default is /tmp/
avail	BIGINT		available space for temp directory in bytes
used	BIGINT		used space for temp directory in bytes
total	BIGINT		total space for temp directory in bytes
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

vgroups_info table

vgroups_info table contains vgroups information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
vgroup_id	INT		vgroup id
database_name	VARCHAR		database for the vgroup
tables_num	BIGINT		number of tables per vgroup
status	VARCHAR		status
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

vnodes_role table

vnodes_role table contains vnode role information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
vnode_role	VARCHAR		role. leader or follower
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

log_summary table

log_summary table contains log summary information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
error	INT		error count
info	INT		info count
debug	INT		debug count
trace	INT		trace count
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

grants_info table

grants_info table contains grants information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
expire_time	BIGINT		time until grants expire in seconds
timeseries_used	BIGINT		timeseries used
timeseries_total	BIGINT		total timeseries
dnode_id	INT	TAG	dnode id
dnode_ep	NCHAR	TAG	dnode endpoint
cluster_id	NCHAR	TAG	cluster id

keeper_monitor table

keeper_monitor table contains keeper monitor information records.

field	type	is_tag	comment
ts	TIMESTAMP		timestamp
cpu	FLOAT		cpu usage
mem	FLOAT		memory usage
identify	NCHAR	TAG

taosadapter_restful_http_request_total table

taosadapter_restful_http_request_total table contains taosadapter rest request information record. The timestamp column of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
gauge	DOUBLE		metric value
client_ip	NCHAR	TAG	client ip
endpoint	NCHAR	TAG	taosadpater endpoint
request_method	NCHAR	TAG	request method
request_uri	NCHAR	TAG	request uri
status_code	NCHAR	TAG	status code

taosadapter_restful_http_request_fail table

taosadapter_restful_http_request_fail table contains taosadapter failed rest request information record. The timestamp column of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
gauge	DOUBLE		metric value
client_ip	NCHAR	TAG	client ip
endpoint	NCHAR	TAG	taosadpater endpoint
request_method	NCHAR	TAG	request method
request_uri	NCHAR	TAG	request uri
status_code	NCHAR	TAG	status code

taosadapter_restful_http_request_in_flight table

taosadapter_restful_http_request_in_flight table contains taosadapter rest request information record in real time. The timestamp column of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
gauge	DOUBLE		metric value
endpoint	NCHAR	TAG	taosadpater endpoint

taosadapter_restful_http_request_summary_milliseconds table

taosadapter_restful_http_request_summary_milliseconds table contains the summary or rest information record. The timestamp column of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
count	DOUBLE
sum	DOUBLE
0.5	DOUBLE
0.9	DOUBLE
0.99	DOUBLE
0.1	DOUBLE
0.2	DOUBLE
endpoint	NCHAR	TAG	taosadpater endpoint
request_method	NCHAR	TAG	request method
request_uri	NCHAR	TAG	request uri

taosadapter_system_mem_percent table

taosadapter_system_mem_percent table contains taosadapter memory usage information. The timestamp of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
gauge	DOUBLE		metric value
endpoint	NCHAR	TAG	taosadpater endpoint

taosadapter_system_cpu_percent table

taosadapter_system_cpu_percent table contains taosadapter cup usage information. The timestamp of this table is _ts.

field	type	is_tag	comment
_ts	TIMESTAMP		timestamp
gauge	DOUBLE		mertic value
endpoint	NCHAR	TAG	taosadpater endpoint