In this article, I’ll show you a simplified way to configure a critical open-source component, Zookeeper. Monitoring Zookeeper applications helps to ensure that the data sets are distributed as expected across the cluster. Although Zookeeper is considered very resilient to network mishaps, it’s inevitable that you will want to monitor the server. To do this, I’ll be using the Zookeeper receiver from OpenTelemetry. The configuration detailed in this post uses observIQ’s distribution of the OpenTelemetry collector, which simplifies the use of OpenTelemetry for all users. You can take a look at the details of this support . in the repo You can utilize this receiver in conjunction with any OTel collector: including the OpenTelemetry Collector and observIQ’s distribution of the collector. Monitoring performance metrics for Zookeeper is necessary to ensure that all the jobs are running as expected and the clusters are humming. The following metrics categories are monitored using this configuration: Znodes You can automatically discover Zookeeper Clusters, monitor memory (heap and non-heap) on the Znode, and get alerts of changes in resource consumption. You can also automatically collect, graph, and get alerts on garbage collection iterations, heap size and usage, and threads. ZooKeeper hosts are deployed in a cluster, and as long as a majority of hosts are up, the service will be available. Note that you must ensure the total node count inside the ZooKeeper tree is consistent. Latency and Throughput This metric will provide a consistent view of the performance of your servers, regardless of whether they change roles from Followers to Leader or back you will get a meaningful view of the history. Configuring the Zookeeper Receiver After the installation, the config file for the collector can be found at: (Windows) C:\Program Files\observIQ OpenTelemetry Collector\config.yaml (Linux) /opt/observiq-otel-collector/config.yaml Receiver Configuration: Configure the attribute. It is set to 60 seconds in this sample configuration. collection_interval Set up the attribute as the system that is running the Hadoop instance endpoint receivers:
  zookeeper:
    collection_interval: 30s
    endpoint: localhost:2181 Processor Configuration: The is used to create a distinction between metrics received from multiple Hadoop systems. This helps with filtering metrics from specific Redis hosts in the monitoring tool, in this case, Google Cloud operations. resource detection processor Add the batch processor to bundle the metrics from multiple receivers. We highly recommend using this processor in the configuration, especially for the benefit of the logging component of the collector. To learn more about this processor . check the documentation processors:
  resourcedetection:
    detectors: ["system"]
    system:
      hostname_sources: ["os"]

  batch: Exporter Configuration: In this example, the metrics are exported to New Relic using the OTLP exporter. If you would like to forward your metrics to a different destination, check the destinations that OpenTelemetry supports at this time, . here exporters:
  otlp:
    endpoint: https://otlp.nr-data.net:443
    headers:
      api-key: 00000-00000-00000
    tls:
      insecure: false Set up the pipeline: service:
  pipelines:
    metrics:
      receivers:
      - zookeeper
      processors:
      - resourcedetection
      - batch
      exporters:
      - otlp Viewing the Metrics All the metrics the Zookeeper receiver scrapes are listed below. Metric Description zookeeper.connection.active The number of active connections. zookeeper.data_tree…hemeral_node.count The number of ephemeral nodes. zookeeper.data_tree.size The size of the data tree. zookeeper.file_descriptor.limit The limit set for the file descriptor. zookeeper.file_descriptor.open The number of open file descriptors zookeeper.latency.max The maximum latency zookeeper.latency.min The minimum latency set. zookeeper.packet.count The packet count zookeeper.request.active The number of active requests zookeeper.watch.count The watch count zookeeper.znode.count The total number of znode. Alerting Now that you have the metrics gathered and exported to the destination of your choice, you may want to explore how to configure alerts for these metrics effectively. Here are some alerting possibilities for ZooKeeper: Alert Severity ZooKeeper server is down critical Too many znodes created warning Too many connections created warning Memory occupied by znode is too large warning Set too many watch warning Too many files open warning Average latency is too high warning JVM memory almost full warning As you can see, this is a simple way to implement the OpenTelemetry standards. Additionally, if you use the observIQ distribution, this provides a single-line installer and integrated receivers, exporter, and processor pool, making working with this collector an easy task. Also Published here

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