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Riak Stats Example

Description

For this example we're going to use check_http_json.py as a pure CLI tool to read Riak's /stats endpoint

Connection information

  • Host = 127.0.0.1:8098
  • Path = /stats

JSON Stats Data

Connectivity Check

  • ring_members: We can use an existence check to monitor the number of ring members
  • connected_nodes: Similarly we can check the number of nodes that are in communication with this node, but this list will be empty in a 1 node cluster

Sample Command

For a single node dev "cluster", you might have a ring_members value like this:

"ring_members": [
    "riak@127.0.0.1"
],

To validate that we have a single node, we can use this check:

$ ./check_http_json.py -H localhost -P 8098 -p stats -E "ring_members(0)"
OK: Status OK.

If we were expecting at least 2 nodes in the cluster, we would use this check:

$ ./check_http_json.py -H localhost -P 8098 -p stats -E "ring_members(1)"
CRITICAL: Status CRITICAL. Key ring_members(1) did not exist.

Obviously this fails because we only had a single ring_member. If we prefer to only get a warning instead of a critical for this check, we just use the correct flag:

$ ./check_http_json.py -H localhost -P 8098 -p stats -e "ring_members(1)"
WARNING: Status WARNING. Key ring_members(1) did not exist.

Gather Metrics

The thresholds for acceptable values for these metrics will vary from system to system, following are the stats we'll be checking:

Throughput Metrics:

  • node_gets
  • node_puts
  • vnode_counter_update
  • vnode_set_update
  • vnode_map_update
  • search_query_throughput_one
  • search_index_throughtput_one
  • consistent_gets
  • consistent_puts
  • vnode_index_reads

Sample Command

./check_http_json.py -H localhost -P 8098 -p stats -m \
    "node_gets" \
    "node_puts" \
    "vnode_counter_update" \
    "vnode_set_update" \
    "vnode_map_update" \
    "search_query_throughput_one" \
    "search_index_throughtput_one" \
    "consistent_gets" \
    "consistent_puts" \
    "vnode_index_reads"

Sample Output

OK: Status OK.|'node_gets'=0 'node_puts'=0 'vnode_counter_update'=0 'vnode_set_update'=0 'vnode_map_update'=0 'search_query_throughput_one'=0 'consistent_gets'=0 'consistent_puts'=0 'vnode_index_reads'=0

Latency Metrics:

  • node_get_fsm_time_mean,_median,_95,_99,_100
  • node_put_fsm_time_mean,_median,_95,_99,_100
  • object_counter_merge_time_mean,_median,_95,_99,_100
  • object_set_merge_time_mean,_median,_95,_99,_100
  • object_map_merge_time_mean,_median,_95,_99,_100
  • search_query_latency_median,_min,_95,_99,_999
  • search_index_latency_median,_min,_95,_99,_999
  • consistent_get_time_mean,_median,_95,_99,_100
  • consistent_put_time_mean,_median,_95,_99,_100

Sample Command

./check_http_json.py -H localhost -P 8098 -p stats -m \
    "node_get_fsm_time_mean,,0:100,0:1000" \
    "node_get_fsm_time_median,,0:100,0:1000" \
    "node_get_fsm_time_95,,0:100,0:1000" \
    "node_get_fsm_time_99,,0:100,0:1000" \
    "node_get_fsm_time_100,,0:100,0:1000" \
    "node_put_fsm_time_mean,,0:100,0:1000" \
    "node_put_fsm_time_median,,0:100,0:1000" \
    "node_put_fsm_time_95,,0:100,0:1000" \
    "node_put_fsm_time_99,,0:100,0:1000" \
    "node_put_fsm_time_100,,0:100,0:1000" \
    "object_counter_merge_time_mean,,0:100,0:1000" \
    "object_counter_merge_time_median,,0:100,0:1000" \
    "object_counter_merge_time_95,,0:100,0:1000" \
    "object_counter_merge_time_99,,0:100,0:1000" \
    "object_counter_merge_time_100,,0:100,0:1000" \
    "object_set_merge_time_mean,,0:100,0:1000" \
    "object_set_merge_time_median,,0:100,0:1000" \
    "object_set_merge_time_95,,0:100,0:1000" \
    "object_set_merge_time_99,,0:100,0:1000" \
    "object_set_merge_time_100,,0:100,0:1000" \
    "object_map_merge_time_mean,,0:100,0:1000" \
    "object_map_merge_time_median,,0:100,0:1000" \
    "object_map_merge_time_95,,0:100,0:1000" \
    "object_map_merge_time_99,,0:100,0:1000" \
    "object_map_merge_time_100,,0:100,0:1000" \
    "consistent_get_time_mean,,0:100,0:1000" \
    "consistent_get_time_median,,0:100,0:1000" \
    "consistent_get_time_95,,0:100,0:1000" \
    "consistent_get_time_99,,0:100,0:1000" \
    "consistent_get_time_100,,0:100,0:1000" \
    "consistent_put_time_mean,,0:100,0:1000" \
    "consistent_put_time_median,,0:100,0:1000" \
    "consistent_put_time_95,,0:100,0:1000" \
    "consistent_put_time_99,,0:100,0:1000" \
    "consistent_put_time_100,,0:100,0:1000" \
    "search_query_latency_median,,0:100,0:1000" \
    "search_query_latency_min,,0:100,0:1000" \
    "search_query_latency_95,,0:100,0:1000" \
    "search_query_latency_99,,0:100,0:1000" \
    "search_query_latency_999,,0:100,0:1000" \
    "search_index_latency_median,,0:100,0:1000" \
    "search_index_latency_min,,0:100,0:1000" \
    "search_index_latency_95,,0:100,0:1000" \
    "search_index_latency_99,,0:100,0:1000" \
    "search_index_latency_999,,0:100,0:1000"

Sample Output

OK: Status OK.|'node_get_fsm_time_mean'=0;0:100;0:1000 'node_get_fsm_time_median'=0;0:100;0:1000 'node_get_fsm_time_95'=0;0:100;0:1000 'node_get_fsm_time_99'=0;0:100;0:1000 'node_get_fsm_time_100'=0;0:100;0:1000 'node_put_fsm_time_mean'=0;0:100;0:1000 'node_put_fsm_time_median'=0;0:100;0:1000 'node_put_fsm_time_95'=0;0:100;0:1000 'node_put_fsm_time_99'=0;0:100;0:1000 'node_put_fsm_time_100'=0;0:100;0:1000 'object_counter_merge_time_mean'=0;0:100;0:1000 'object_counter_merge_time_median'=0;0:100;0:1000 'object_counter_merge_time_95'=0;0:100;0:1000 'object_counter_merge_time_99'=0;0:100;0:1000 'object_counter_merge_time_100'=0;0:100;0:1000 'object_set_merge_time_mean'=0;0:100;0:1000 'object_set_merge_time_median'=0;0:100;0:1000 'object_set_merge_time_95'=0;0:100;0:1000 'object_set_merge_time_99'=0;0:100;0:1000 'object_set_merge_time_100'=0;0:100;0:1000 'object_map_merge_time_mean'=0;0:100;0:1000 'object_map_merge_time_median'=0;0:100;0:1000 'object_map_merge_time_95'=0;0:100;0:1000 'object_map_merge_time_99'=0;0:100;0:1000 'object_map_merge_time_100'=0;0:100;0:1000 'consistent_get_time_mean'=0;0:100;0:1000 'consistent_get_time_median'=0;0:100;0:1000 'consistent_get_time_95'=0;0:100;0:1000 'consistent_get_time_99'=0;0:100;0:1000 'consistent_get_time_100'=0;0:100;0:1000 'consistent_put_time_mean'=0;0:100;0:1000 'consistent_put_time_median'=0;0:100;0:1000 'consistent_put_time_95'=0;0:100;0:1000 'consistent_put_time_99'=0;0:100;0:1000 'consistent_put_time_100'=0;0:100;0:1000 'search_query_latency_median'=0;0:100;0:1000 'search_query_latency_min'=0;0:100;0:1000 'search_query_latency_95'=0;0:100;0:1000 'search_query_latency_99'=0;0:100;0:1000 'search_query_latency_999'=0;0:100;0:1000 'search_index_latency_median'=0;0:100;0:1000 'search_index_latency_min'=0;0:100;0:1000 'search_index_latency_95'=0;0:100;0:1000 'search_index_latency_99'=0;0:100;0:1000 'search_index_latency_999'=0;0:100;0:1000

Erlang Resource Usage Metrics:

  • sys_process_count
  • memory_processes
  • memory_processes_used

Sample Command

./check_http_json.py -H localhost -P 8098 -p stats -m \
    "sys_process_count,,0:5000,0:10000" \
    "memory_processes,,0:50000000,0:100000000" \
    "memory_processes_used,,0:50000000,0:100000000"

Sample Output

OK: Status OK.|'sys_process_count'=1637;0:5000;0:10000 'memory_processes'=46481112;0:50000000;0:100000000 'memory_processes_used'=46476880;0:50000000;0:100000000

General Riak Load / Health Metrics:

  • node_get_fsm_siblings_mean,_median,_95,_99,_100
  • node_get_fsm_objsize_mean,_median,_95,_99,_100
  • riak_search_vnodeq_mean,_median,_95,_99,_100
  • search_index_fail_one
  • pbc_active
  • pbc_connects
  • read_repairs
  • list_fsm_active
  • node_get_fsm_rejected
  • node_put_fsm_rejected

Sample Command

./check_http_json.py -H localhost -P 8098 -p stats -m \
    "node_get_fsm_siblings_mean,,0:100,0:1000" \
    "node_get_fsm_siblings_median,,0:100,0:1000" \
    "node_get_fsm_siblings_95,,0:100,0:1000" \
    "node_get_fsm_siblings_99,,0:100,0:1000" \
    "node_get_fsm_siblings_100,,0:100,0:1000" \
    "node_get_fsm_objsize_mean,,0:100,0:1000" \
    "node_get_fsm_objsize_median,,0:100,0:1000" \
    "node_get_fsm_objsize_95,,0:100,0:1000" \
    "node_get_fsm_objsize_99,,0:100,0:1000" \
    "node_get_fsm_objsize_100,,0:100,0:1000" \
    "riak_search_vnodeq_mean,,0:100,0:1000" \
    "riak_search_vnodeq_median,,0:100,0:1000" \
    "riak_search_vnodeq_95,,0:100,0:1000" \
    "riak_search_vnodeq_99,,0:100,0:1000" \
    "riak_search_vnodeq_100,,0:100,0:1000" \
    "search_index_fail_one,,0:100,0:1000" \
    "pbc_active,,0:100,0:1000" \
    "pbc_connects,,0:100,0:1000" \
    "read_repairs,,0:100,0:1000" \
    "list_fsm_active,,0:100,0:1000" \
    "node_get_fsm_rejected,,0:100,0:1000" \
    "node_put_fsm_rejected,,0:100,0:1000"

Sample Output

OK: Status OK.|'node_get_fsm_siblings_mean'=0;0:100;0:1000 'node_get_fsm_siblings_median'=0;0:100;0:1000 'node_get_fsm_siblings_95'=0;0:100;0:1000 'node_get_fsm_siblings_99'=0;0:100;0:1000 'node_get_fsm_siblings_100'=0;0:100;0:1000 'node_get_fsm_objsize_mean'=0;0:100;0:1000 'node_get_fsm_objsize_median'=0;0:100;0:1000 'node_get_fsm_objsize_95'=0;0:100;0:1000 'node_get_fsm_objsize_99'=0;0:100;0:1000 'node_get_fsm_objsize_100'=0;0:100;0:1000      'search_index_fail_one'=0;0:100;0:1000 'pbc_active'=0;0:100;0:1000 'pbc_connects'=0;0:100;0:1000 'read_repairs'=0;0:100;0:1000 'list_fsm_active'=0;0:100;0:1000 'node_get_fsm_rejected'=0;0:100;0:1000 'node_put_fsm_rejected'=0;0:100;0:1000