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| |
| <!--- |
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| <p>Ozone provides multiple tools to get more information about the current state of the cluster.</p> |
| <h2 id="prometheus">Prometheus</h2> |
| <p>Ozone has native support for Prometheus integration. All internal metrics (collected by Hadoop metrics framework) are published under the <code>/prom</code> HTTP endpoint. (For example under http://localhost:9876/prom for SCM).</p> |
| <p>The Prometheus endpoint is turned on by default but can be turned off by the <code>hdds.prometheus.endpoint.enabled</code> configuration variable.</p> |
| <p>In a secure environment the page is guarded with SPNEGO authentication which is not supported by Prometheus. To enable monitoring in a secure environment, a specific authentication token can be configured</p> |
| <p>Example <code>ozone-site.xml</code>:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-XML" data-lang="XML"><span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>hdds.prometheus.endpoint.token<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value></span>putyourtokenhere<span style="color:#f92672"></value></span> |
| <span style="color:#f92672"></property></span> |
| </code></pre></div><p>Example prometheus configuration:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-YAML" data-lang="YAML"><span style="color:#f92672">scrape_configs</span>: |
| - <span style="color:#f92672">job_name</span>: <span style="color:#ae81ff">ozone</span> |
| <span style="color:#f92672">bearer_token</span>: <span style="color:#ae81ff"><putyourtokenhere></span> |
| <span style="color:#f92672">metrics_path</span>: <span style="color:#ae81ff">/prom</span> |
| <span style="color:#f92672">static_configs</span>: |
| - <span style="color:#f92672">targets</span>: |
| - <span style="color:#e6db74">"127.0.0.1:9876"</span> |
| </code></pre></div><h2 id="grafana">Grafana</h2> |
| <p>Once Prometheus is up and running, Grana can be configured to monitor and visualize Ozone metrics.</p> |
| <h3 id="add-prometheus-as-a-data-source">Add Prometheus as a data source</h3> |
| <p>In the Grafana web UI, go to <code>Add Data Sources</code> and then select <code>Prometheus</code>.</p> |
| <p>Enter the Prometheus hostname/port in the <code>HTTP</code>. For example, http://localhost:9094 (verify the port used by looking at Prometheus command line flags <code>-web.listen-address</code>. The port can also be found from Prometheus web UI → Status → Command-Line Flags.)</p> |
| <p>Choose Prometheus type: <code>Prometheus</code></p> |
| <p>Choose Prometheus version: <code>2.37.x</code></p> |
| <p>Finish the setup by clicking on <code>Save and Test</code>.</p> |
| <h3 id="import-a-grafana-dashboard-for-ozone">Import a Grafana dashboard for Ozone</h3> |
| <p>Apache Ozone comes with a default Grafana dashboard. Follow the instructions below to import it:</p> |
| <p>Download dashboard json:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">wget https://raw.githubusercontent.com/apache/ozone/master/hadoop-ozone/dist/src/main/compose/common/grafana/dashboards/Ozone%20-%20Overall%20Metrics.json |
| </code></pre></div><p>Open Grafana portal and click on Dashboards on the left and select <code>Import</code>.</p> |
| <p>Click at <code>Upload JSON file</code> and select the file <code>Ozone - Overall Metrics.json</code> that was just downloaded.</p> |
| <p>The dashboard is now imported.</p> |
| <p> |
| |
| <img src="GrafanaOzoneOverall.png" alt='Overall dashboard' class="img-responsive" /></p> |
| <p>Repeat the same for <a href="https://raw.githubusercontent.com/Xushaohong/ozone/master/hadoop-ozone/dist/src/main/compose/common/grafana/dashboards/Ozone%20-%20Object%20Metrics.json">Object Metrics</a> dashboard and <a href="https://raw.githubusercontent.com/Xushaohong/ozone/master/hadoop-ozone/dist/src/main/compose/common/grafana/dashboards/Ozone%20-%20RPC%20Metrics.json">RPC Metrics</a> dashboard.</p> |
| <p> |
| |
| <img src="GrafanaOzoneObjectMetrics.png" alt='Object dashboard' class="img-responsive" /></p> |
| <p> |
| |
| <img src="GrafanaOzoneRPCMetrics.png" alt='RPC dashboard' class="img-responsive" /></p> |
| <h2 id="distributed-tracing">Distributed tracing</h2> |
| <p>Distributed tracing can help to understand performance bottleneck with visualizing end-to-end performance.</p> |
| <p>Ozone uses <a href="https://jaegertracing.io">jaeger</a> tracing library to collect traces which can send tracing data to any compatible backend (Zipkin, …).</p> |
| <p>Tracing is turned off by default, but can be turned on with <code>hdds.tracing.enabled</code> from <code>ozone-site.xml</code></p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-XML" data-lang="XML"><span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>hdds.tracing.enabled<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value></span>true<span style="color:#f92672"></value></span> |
| <span style="color:#f92672"></property></span> |
| </code></pre></div><p>Jaeger client can be configured with environment variables as documented <a href="https://github.com/jaegertracing/jaeger-client-java/blob/master/jaeger-core/README.md">here</a>:</p> |
| <p>For example:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">JAEGER_SAMPLER_PARAM<span style="color:#f92672">=</span>0.01 |
| JAEGER_SAMPLER_TYPE<span style="color:#f92672">=</span>probabilistic |
| JAEGER_AGENT_HOST<span style="color:#f92672">=</span>jaeger |
| </code></pre></div><p>This configuration will record 1% of the requests to limit the performance overhead. For more information about jaeger sampling <a href="https://www.jaegertracing.io/docs/1.18/sampling/#client-sampling-configuration">check the documentation</a></p> |
| <h2 id="ozone-insight">ozone insight</h2> |
| <p>Ozone insight is a swiss-army-knife tool to for checking the current state of Ozone cluster. It can show logging, metrics and configuration for a particular component.</p> |
| <p>To check the available components use <code>ozone insight list</code>:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">> ozone insight list |
| |
| Available insight points: |
| |
| scm.node-manager SCM Datanode management related information. |
| scm.replica-manager SCM closed container replication manager |
| scm.event-queue Information about the internal async event delivery |
| scm.protocol.block-location SCM Block location protocol endpoint |
| scm.protocol.container-location SCM Container location protocol endpoint |
| scm.protocol.security SCM Block location protocol endpoint |
| om.key-manager OM Key Manager |
| om.protocol.client Ozone Manager RPC endpoint |
| datanode.pipeline More information about one ratis datanode ring. |
| </code></pre></div><h3 id="configuration">Configuration</h3> |
| <p><code>ozone insight config</code> can show configuration related to a specific component (supported only for selected components).</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">> ozone insight config scm.replica-manager |
| |
| Configuration <span style="color:#66d9ef">for</span> <span style="color:#e6db74">`</span>scm.replica-manager<span style="color:#e6db74">`</span> <span style="color:#f92672">(</span>SCM closed container replication manager<span style="color:#f92672">)</span> |
| |
| >>> hdds.scm.replication.thread.interval |
| default: 300s |
| current: 300s |
| |
| There is a replication monitor thread running inside SCM which takes care of replicating the containers in the cluster. This property is used to configure the interval in which that thread runs. |
| |
| |
| >>> hdds.scm.replication.event.timeout |
| default: 30m |
| current: 30m |
| |
| Timeout <span style="color:#66d9ef">for</span> the container replication/deletion commands sent to datanodes. After this timeout the command will be retried. |
| |
| </code></pre></div><h3 id="metrics">Metrics</h3> |
| <p><code>ozone insight metrics</code> can show metrics related to a specific component (supported only for selected components).</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">> ozone insight metrics scm.protocol.block-location |
| Metrics <span style="color:#66d9ef">for</span> <span style="color:#e6db74">`</span>scm.protocol.block-location<span style="color:#e6db74">`</span> <span style="color:#f92672">(</span>SCM Block location protocol endpoint<span style="color:#f92672">)</span> |
| |
| RPC connections |
| |
| Open connections: <span style="color:#ae81ff">0</span> |
| Dropped connections: <span style="color:#ae81ff">0</span> |
| Received bytes: <span style="color:#ae81ff">1267</span> |
| Sent bytes: <span style="color:#ae81ff">2420</span> |
| |
| |
| RPC queue |
| |
| RPC average queue time: 0.0 |
| RPC call queue length: <span style="color:#ae81ff">0</span> |
| |
| |
| RPC performance |
| |
| RPC processing time average: 0.0 |
| Number of slow calls: <span style="color:#ae81ff">0</span> |
| |
| |
| Message type counters |
| |
| Number of AllocateScmBlock: ??? |
| Number of DeleteScmKeyBlocks: ??? |
| Number of GetScmInfo: ??? |
| Number of SortDatanodes: ??? |
| </code></pre></div><h3 id="logs">Logs</h3> |
| <p><code>ozone insight logs</code> can connect to the required service and show the DEBUG/TRACE log related to one specific component. For example to display RPC message:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">>ozone insight logs om.protocol.client |
| |
| <span style="color:#f92672">[</span>OM<span style="color:#f92672">]</span> 2020-07-28 12:31:49,988 <span style="color:#f92672">[</span>DEBUG|org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB|OzoneProtocolMessageDispatcher<span style="color:#f92672">]</span> OzoneProtocol ServiceList request is received |
| <span style="color:#f92672">[</span>OM<span style="color:#f92672">]</span> 2020-07-28 12:31:50,095 <span style="color:#f92672">[</span>DEBUG|org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB|OzoneProtocolMessageDispatcher<span style="color:#f92672">]</span> OzoneProtocol CreateVolume request is received |
| </code></pre></div><p>Using <code>-v</code> flag the content of the protobuf message can also be displayed (TRACE level log):</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">ozone insight logs -v om.protocol.client |
| |
| <span style="color:#f92672">[</span>OM<span style="color:#f92672">]</span> 2020-07-28 12:33:28,463 <span style="color:#f92672">[</span>TRACE|org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB|OzoneProtocolMessageDispatcher<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>service<span style="color:#f92672">=</span>OzoneProtocol<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>type<span style="color:#f92672">=</span>CreateVolume<span style="color:#f92672">]</span> request is received: |
| cmdType: CreateVolume |
| traceID: <span style="color:#e6db74">""</span> |
| clientId: <span style="color:#e6db74">"client-A31DF5C6ECF2"</span> |
| createVolumeRequest <span style="color:#f92672">{</span> |
| volumeInfo <span style="color:#f92672">{</span> |
| adminName: <span style="color:#e6db74">"hadoop"</span> |
| ownerName: <span style="color:#e6db74">"hadoop"</span> |
| volume: <span style="color:#e6db74">"vol1"</span> |
| quotaInBytes: <span style="color:#ae81ff">1152921504606846976</span> |
| volumeAcls <span style="color:#f92672">{</span> |
| type: USER |
| name: <span style="color:#e6db74">"hadoop"</span> |
| rights: <span style="color:#e6db74">"200"</span> |
| aclScope: ACCESS |
| <span style="color:#f92672">}</span> |
| volumeAcls <span style="color:#f92672">{</span> |
| type: GROUP |
| name: <span style="color:#e6db74">"users"</span> |
| rights: <span style="color:#e6db74">"200"</span> |
| aclScope: ACCESS |
| <span style="color:#f92672">}</span> |
| creationTime: <span style="color:#ae81ff">1595939608460</span> |
| objectID: <span style="color:#ae81ff">0</span> |
| updateID: <span style="color:#ae81ff">0</span> |
| modificationTime: <span style="color:#ae81ff">0</span> |
| <span style="color:#f92672">}</span> |
| <span style="color:#f92672">}</span> |
| |
| <span style="color:#f92672">[</span>OM<span style="color:#f92672">]</span> 2020-07-28 12:33:28,474 <span style="color:#f92672">[</span>TRACE|org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB|OzoneProtocolMessageDispatcher<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>service<span style="color:#f92672">=</span>OzoneProtocol<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>type<span style="color:#f92672">=</span>CreateVolume<span style="color:#f92672">]</span> request is processed. Response: |
| cmdType: CreateVolume |
| traceID: <span style="color:#e6db74">""</span> |
| success: false |
| message: <span style="color:#e6db74">"Volume already exists"</span> |
| status: VOLUME_ALREADY_EXISTS |
| </code></pre></div><div class="alert alert-warning" role="alert"> |
| <p>Under the hood <code>ozone insight</code> uses HTTP endpoints to retrieve the required information (<code>/conf</code>, <code>/prom</code> and <code>/logLevel</code> endpoints). It’s not yet supported in secure environment.</p> |
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