Heka

Heka

Heka is an open source stream processing software system developed by Mozilla. Heka is a “Swiss Army Knife” type tool for data processing, useful for a wide variety of different tasks, such as:

• Loading and parsing log files from a file system.
• Accepting statsd type metrics data for aggregation and forwarding to upstream time series data stores such as graphite or InfluxDB.
• Launching external processes to gather operational data from the local system.
• Performing real time analysis, graphing, and anomaly detection on any data flowing through the Heka pipeline.
• Shipping data from one location to another via the use of an external transport (such as AMQP) or directly (via TCP).
• Delivering processed data to one or more persistent data stores.

Configuration overview

All LMA heka config files are located in /etc/lma_collector folder. e.g. on controller there are follwing confguration files:

amqp-openstack_error.toml
amqp-openstack_info.toml
amqp-openstack_warn.toml
decoder-collectd.toml
decoder-http-check.toml
decoder-keystone_7_0.toml
decoder-keystone_wsgi.toml
decoder-mysql.toml
decoder-notification.toml
decoder-openstack.toml
decoder-ovs.toml
decoder-pacemaker.toml
decoder-rabbitmq.toml
decoder-swift.toml
decoder-system.toml
encoder-elasticsearch.toml
encoder-influxdb.toml
encoder-nagios_afd_nodes_debug.toml
encoder-nagios_afd_nodes.toml
encoder-nagios_gse_global_clusters.toml
encoder-nagios_gse_node_clusters.toml
filter-afd_api_backends.toml
filter-afd_api_endpoints.toml
filter-afd_node_controller_cpu.toml
filter-afd_node_controller_log-fs.toml
filter-afd_node_controller_root-fs.toml
filter-afd_node_mysql-nodes_mysql-fs.toml
filter-afd_service_apache_worker.toml
filter-afd_service_cinder-api_http_errors.toml
filter-afd_service_glance-api_http_errors.toml
filter-afd_service_heat-api_http_errors.toml
filter-afd_service_keystone-admin-api_http_errors.toml
filter-afd_service_keystone-public-api_http_errors.toml
filter-afd_service_mysql_node-status.toml
filter-afd_service_neutron-api_http_errors.toml
filter-afd_service_nova-api_http_errors.toml
filter-afd_service_rabbitmq_disk.toml
filter-afd_service_rabbitmq_memory.toml
filter-afd_service_rabbitmq_queue.toml
filter-afd_service_swift-api_http_errors.toml
filter-afd_workers.toml
filter-gse_global.toml
filter-gse_node.toml
filter-gse_service.toml
filter-heka_monitoring.toml
filter-http_metrics.toml
filter-influxdb_accumulator.toml
filter-influxdb_annotation.toml
filter-instance_state.toml
filter-resource_creation_time.toml
filter-service_heartbeat.toml
global.toml
httplisten-collectd.toml
httplisten-http-check.toml
input-aggregator.toml
logstreamer-keystone_7_0.toml
logstreamer-keystone_wsgi.toml
logstreamer-mysql.toml
logstreamer-openstack_7_0.toml
logstreamer-openstack_dashboard.toml
logstreamer-ovs.toml
logstreamer-pacemaker.toml
logstreamer-rabbitmq.toml
logstreamer-swift.toml
logstreamer-system.toml
multidecoder-aggregator.toml
output-aggregator.toml
output-dashboard.toml
output-elasticsearch.toml
output-influxdb.toml
output-nagios_afd_nodes.toml
output-nagios_gse_global_clusters.toml
output-nagios_gse_node_clusters.toml
scribbler-aggregator_flag.toml
splitter-openstack.toml
splitter-rabbitmq.toml

Heka's configuration files can be divided into follwing groups:

• Inputs
• Splitters
• Decoders
• Filters
• Encoders
• Outputs

Inputs

On controller there are following inputs groups:

AMQPInput

AMQP input (https://hekad.readthedocs.org/en/v0.10.0/config/inputs/amqp.html)
There are followinf AMQP inputs:

• amqp-openstack_error.toml
• amqp-openstack_info.toml
• amqp-openstack_warn.toml

All AMQP inputs looks like:

[openstack_error_amqp]
type = "AMQPInput"
url = "amqp://nova:nova_password@192.168.0.2:5673/"
exchange = "nova"
exchange_type = "topic"
exchange_durability = false
exchange_auto_delete = false
queue_auto_delete = false
queue = "lma_notifications.error"
routing_key = "lma_notifications.error"
decoder = "notification_decoder"
splitter = "NullSplitter"
can_exit = true

The only difference between AMQP inputs are queue and routing_key parameter:

queue = "lma_notifications.info"
routing_key = "lma_notifications.info"

All AMQP inputs use one decoder to decode AMQP messages: notification_decoder, configuration can be found in decoder-notification.toml file.

LMA plugin configures openstack services to use 'lma_notifications' as notification_topics, e.g :

# cat /etc/nova/nova.conf | grep lma
notification_topics=lma_notifications

so heka is enable to get messages from queue and decode it.
Also, it is possible to see rabbitmq messages using trace plugin, for details please see: http://wiki.sirmax.noname.com.ua/index.php/Rabbitmq_trace#RabbitMQ_log_messages

HttpListenInput

HttpListenInput plugins start a webserver listening on the specified address and port. For more detail: https://hekad.readthedocs.org/en/v0.10.0/config/inputs/httplisten.html
There are the folljwing HttpListen inputs configured in LMA (controller)

• httplisten-collectd.toml
• httplisten-http-check.toml

httplisten-collectd

[collectd_httplisten]
type="HttpListenInput"
address = "127.0.0.1:8325"
decoder = "collectd_decoder"
splitter = "NullSplitter"

httplisten-http-check

[http-check_httplisten]
type="HttpListenInput"
address = "192.168.0.2:5566"
decoder = "http-check_decoder"
splitter = "NullSplitter"

This is 'opened port' used for haproxy http check. As you can see in haproxy config, this port is used only for check 'is heka running or not' for expose port 5565 from input-aggregator. /etc/haproxy/conf.d/999-lma.cfg

listen lma
  bind 192.168.0.7:5565
  balance  roundrobin
  mode  tcp
  option  httpchk
  option  tcplog
  server node-6 192.168.0.2:5565  check port 5566

TcpInput

input-aggregator.toml

LogstreamerInput

• logstreamer-keystone_7_0.toml
• logstreamer-keystone_wsgi.toml
• logstreamer-mysql.toml
• logstreamer-openstack_7_0.toml
• logstreamer-openstack_dashboard.toml
• logstreamer-ovs.toml
• logstreamer-pacemaker.toml
• logstreamer-rabbitmq.toml
• logstreamer-swift.toml
• logstreamer-system.toml

Splitters

Splitter details: https://hekad.readthedocs.org/en/v0.10.0/config/splitters/index.html
There are only one custom splitter:

[openstack_splitter]
type = "RegexSplitter"
delimiter = '(<[0-9]+>)'
delimiter_eol = false

Decoders

decoder-collectd.toml
decoder-libvirt.toml
decoder-openstack.toml
decoder-ovs.toml
decoder-system.toml

Heka Debugging

[RstEncoder]

[output_file]
type = "FileOutput"
#message_matcher = "Fields[aggregator] == NIL && Type == 'heka.sandbox.afd_node_metric'"
message_matcher = "Fields[aggregator] == NIL"
path = "/var/log/heka-debug.log"
perm = "666"
flush_count = 100
flush_operator = "OR"
#encoder = "nagios_afd_nodes_encoder_debug"
encoder = "RstEncoder"