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Monitoring
Ozan Tezcan edited this page May 9, 2021
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Resql provides read-only tables for monitoring. You can observe cluster status, RAM capacity, disk usage of the nodes etc. Also, you can monitor client info e.g connection time, prepared statements, connection addresses.
| Table | Description |
|---|---|
| resql_log | Cluster-wide log table, node list, log about adding/removing node to/from cluster |
| resql_clients | Info about connected clients |
| resql_nodes | Nodes, connection status, machine stats |
| resql_statements | Prepared statements |
resql> SELECT * FROM resql_log
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| id | date | level | log |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 0 | 2021-05-09 01:03:14 | INFO | Cluster init. |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 3 | 2021-05-09 01:03:14 | INFO | Term[1] : [node0:leader] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 4 | 2021-05-09 01:03:14 | INFO | Term start |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 7 | 2021-05-09 01:03:14 | INFO | Adding node : [tcp://[email protected]:7601] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 8 | 2021-05-09 01:03:14 | INFO | Term[1] : [node0:leader] [node1:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 18 | 2021-05-09 01:03:14 | INFO | Adding node : [tcp://[email protected]:7602] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 19 | 2021-05-09 01:03:14 | INFO | Term[1] : [node0:leader] [node1:follower] [node2:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 24 | 2021-05-09 01:03:14 | INFO | Adding node : [tcp://[email protected]:7603] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 25 | 2021-05-09 01:03:14 | INFO | Term[1] : [node0:leader] [node1:follower] [node2:follower] [node3:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 30 | 2021-05-09 01:03:14 | INFO | Adding node : [tcp://[email protected]:7604] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 31 | 2021-05-09 01:03:14 | INFO | Term[1] : [node0:leader] [node1:follower] [node2:follower] [node3:follower] [node4:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 35 | 2021-05-09 01:03:14 | INFO | Term[2] : [node0:follower] [node1:leader] [node2:follower] [node3:follower] [node4:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 37 | 2021-05-09 01:03:18 | INFO | Term start |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 50 | 2021-05-09 01:03:55 | ERROR | Remove node[node10] : Node does not exists. |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 55 | 2021-05-09 01:04:05 | INFO | Node[node0] will be removed from the cluster |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 56 | 2021-05-09 01:04:05 | INFO | Term[2] : [node1:leader] [node2:follower] [node3:follower] [node4:follower] |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
| 60 | 2021-05-09 01:04:15 | ERROR | Remove node[node0] : Node does not exists. |
+----+---------------------+-------+-----------------------------------------------------------------------------------------------+
resql> SELECT * FROM resql_clients
+----------------+-----------+----------+----------------+-----------------+---------------------+------+
| client_name | client_id | sequence | local | remote | connect_time | resp |
+----------------+-----------+----------+----------------+-----------------+---------------------+------+
| gQS0SnOialYh50 | 11 | 4 | 127.0.0.1:7601 | 127.0.0.1:59546 | 2021-05-09 04:03:18 | null |
+----------------+-----------+----------+----------------+-----------------+---------------------+------+
| g_506FP0 | 40 | 0 | 127.0.0.1:7601 | 127.0.0.1:59558 | 2021-05-09 04:03:18 | null |
+----------------+-----------+----------+----------------+-----------------+---------------------+------+
resql> SELECT * FROM resql_nodes
Row number : 0
name : node4
connected : true
role : follower
urls : tcp://[email protected]:7604
version : 0.0.17-latest
git_branch : dev
git_commit : ea8f342
machine : Linux 5.4.0-72-generic x86_64
arch : 64
pid : 29849
current_time : 09-05-2021 04:05
start_date : 09-05-2021 04:03
start_time : 1620522194099
uptime_seconds : 151
uptime_days : 0
cpu_sys : 1.024037
cpu_user : 1.200216
network_recv_bytes : 42471
network_send_bytes : 10799
network_recv : 41.48 KB
network_send : 10.55 KB
total_memory_bytes : 33508593664
total_memory : 31.21 GB
used_memory_bytes : 6135808
used_memory : 5.85 MB
fsync_count : 29
fsync_max_ms : 29.512344
fsync_average_ms : 8.908262
snapshot_success : true
snapshot_size_bytes : 40960
snapshot_size : 40.00 KB
snapshot_max_ms : 0.001000
snapshot_average_ms : 0.001000
dir : /tmp/node4
disk_used_bytes : 67215719
disk_used : 64.10 MB
disk_free_bytes : 23494537216
disk_free : 21.88 GB
--------------------------
Row number : 1
name : node1
connected : true
role : leader
urls : tcp://[email protected]:7601
version : 0.0.17-latest
git_branch : dev
git_commit : ea8f342
machine : Linux 5.4.0-72-generic x86_64
arch : 64
pid : 29849
current_time : 09-05-2021 04:05
start_date : 09-05-2021 04:03
start_time : 1620522194049
uptime_seconds : 161
uptime_days : 0
cpu_sys : 1.067285
cpu_user : 1.243333
network_recv_bytes : 49304
network_send_bytes : 130571
network_recv : 48.15 KB
network_send : 127.51 KB
total_memory_bytes : 33508593664
total_memory : 31.21 GB
used_memory_bytes : 6135808
used_memory : 5.85 MB
fsync_count : 30
fsync_max_ms : 7.186787
fsync_average_ms : 3.553254
snapshot_success : true
snapshot_size_bytes : 40960
snapshot_size : 40.00 KB
snapshot_max_ms : 0.001000
snapshot_average_ms : 0.001000
dir : /tmp/node1
disk_used_bytes : 67215719
disk_used : 64.10 MB
disk_free_bytes : 23492616192
disk_free : 21.88 GB
--------------------------
resql> SELECT * FROM resql_statements
+-----+-----------+-------------+-------------------------------------------+
| id | client_id | client_name | sql |
+-----+-----------+-------------+-------------------------------------------+
| 161 | 158 | JavaClient1 | INSERT INTO key_value VALUES(?, ?); |
+-----+-----------+-------------+-------------------------------------------+
| 162 | 158 | JavaClient1 | DELETE FROM key_value WHERE key = ?; |
+-----+-----------+-------------+-------------------------------------------+
| 163 | 158 | JavaClient1 | SELECT value from key_value WHERE key = ? |
+-----+-----------+-------------+-------------------------------------------+
| 164 | 159 | JavaClient2 | SELECT * FROM key_value WHERE value > ? |
+-----+-----------+-------------+-------------------------------------------+
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