Apache ZooKeeper

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The Apache ZooKeeper integration collects traffic metrics for nodes, such as latency, active requests, and active connections. The integration also collects ZooKeeper logs and parses them into a JSON payload. The result includes fields for node ID, source, level, and message.

For more information about ZooKeeper, see zookeeper.apache.org.

Prerequisites

To collect and ingest ZooKeeper logs and metrics, you must install Ops Agent version 2.11.0 or higher.

This receiver supports Apache ZooKeeper versions 3.5, 3.6, and 3.7.

Configure the Ops Agent for ZooKeeper

Following the guide for Configuring the Ops Agent, add the required elements to collect logs and metrics from your ZooKeeper instances, and restart the agent.

Example configuration

The following command creates the configuration file to collect and ingest logs and metrics for ZooKeeper and restarts the Ops Agent on Linux.

sudo tee /etc/google-cloud-ops-agent/config.yaml > /dev/null << EOF
logging:
  receivers:
    zookeeper_general:
      type: zookeeper_general
  service:
    pipelines:
      zookeeper_general:
        receivers:
          - zookeeper_general
metrics:
  receivers:
    zookeeper:
      type: zookeeper
  service:
    pipelines:
      zookeeper:
        receivers:
          - zookeeper
EOF
sudo service google-cloud-ops-agent restart

Configure logs collection

To ingest logs from ZooKeeper, you must create receivers for the logs ZooKeeper produces and then create a pipeline for the new receivers. To configure a receiver for your zookeeper_general logs, specify the following fields:

Field Default Description
type The value must be zookeeper_general.
include_paths [/opt/zookeeper/logs/zookeeper-*.out, /var/log/zookeeper/zookeeper.log] A list of filesystem paths to read by tailing each file. A wild card (*) can be used in the paths; for example, /var/log/zookeeper*/*.log.
exclude_paths A list of filesystem path patterns to exclude from the set matched by include_paths.
record_log_file_path false If set to true, then the path to the specific file from which the log record was obtained appears in the output log entry as the value of the agent.googleapis.com/log_file_path label. When using a wildcard, only the path of the file from which the record was obtained is recorded.
wildcard_refresh_interval 60s The interval at which wildcard file paths in include_paths are refreshed. Specified as a time interval parsable by time.ParseDuration. Must be a multiple of 1s.

What is logged

The logName of the zookeeper_general logs are derived from the receiver IDs specified in the configuration. Detailed fields inside the LogEntry are as follows.

Field Type Description
timestamp string (Timestamp) Time the request was received.
jsonPayload.line number Line number from which the log was generated in source.
jsonPayload.source string Source of where the log originated.
jsonPayload.thread string Thread from which the log originated.
jsonPayload.myid number Numeric ID of the Zookeeper instance.
jsonPayload.message string Log message, including detailed stack trace where provided.
severity string (LogSeverity) Log entry level (translated).

Configure metrics collection

To collect metrics from ZooKeeper, you must create a receiver for ZooKeeper metrics and then create a pipeline for the new receiver. To configure a receiver for your ZooKeeper metrics, specify the following fields:

Field Default Description
type The value must be zookeeper.
endpoint localhost:2181 The URL exposed by ZooKeeper.
collection_interval 60s A time.Duration value, such as 30s or 5m.

What is monitored

The following table provides the list of metrics that the Ops Agent collects from the ZooKeeper instance.

Metric type 
Kind, Type
Monitored resources
Labels
workload.googleapis.com/zookeeper.connection.active
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.data_tree.ephemeral_node.count
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.data_tree.size
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.file_descriptor.limit
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.file_descriptor.open
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.fsync.exceeded_threshold.count
CUMULATIVEINT64
gce_instance
 
workload.googleapis.com/zookeeper.latency.avg
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.latency.max
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.latency.min
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.packet.count
CUMULATIVEINT64
gce_instance
direction
workload.googleapis.com/zookeeper.request.active
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.watch.count
GAUGEINT64
gce_instance
 
workload.googleapis.com/zookeeper.znode.count
GAUGEINT64
gce_instance
 

Sample dashboard

You can view the metrics from this integration using a sample Cloud Monitoring dashboard. Complete the Installing sample dashboards procedures to import the ZooKeeper GCE Overview dashboard from the Sample library and view charts that display your Apache ZooKeeper metrics.

Verify the configuration

You can use the Logs Explorer and Metrics Explorer to verify that you correctly configured the ZooKeeper receiver. It might take one or two minutes for the Ops Agent to begin collecting logs and metrics.

To verify the logs are ingested, go to the Logs Explorer and run the following query to view the ZooKeeper logs:

resource.type="gce_instance"
logName=("projects/PROJECT_ID/logs/zookeeper_general")


To verify the metrics are ingested, go to Metrics Explorer and run the following query in the MQL tab.

fetch gce_instance
| metric 'workload.googleapis.com/zookeeper.packet.count'
| align rate(1m)
| every 1m

What's next

For a walkthrough on how to use Ansible to install the Ops Agent, configure a third-party application, and install a sample dashboard, see the Install the Ops Agent to troubleshoot third-party applications video.